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From zhang...@apache.org
Subject [hbase] 04/07: HBASE-22695 Store the rsgroup of a table in table configuration (#426)
Date Sun, 01 Sep 2019 14:14:26 GMT
This is an automated email from the ASF dual-hosted git repository.

zhangduo pushed a commit to branch HBASE-22514
in repository https://gitbox.apache.org/repos/asf/hbase.git

commit f62c638d0e6b80ad05178174b87da0c344399b59
Author: Duo Zhang <zhangduo@apache.org>
AuthorDate: Sat Aug 3 07:53:27 2019 +0800

    HBASE-22695 Store the rsgroup of a table in table configuration (#426)
    
    Signed-off-by: Guanghao Zhang <zghao@apache.org>
---
 .../org/apache/hadoop/hbase/HTableDescriptor.java  |   6 +
 .../hadoop/hbase/client/TableDescriptor.java       |   8 +
 .../hbase/client/TableDescriptorBuilder.java       |  19 ++
 .../apache/hadoop/hbase/rsgroup/RSGroupInfo.java   |  42 ++-
 .../org/apache/hadoop/hbase/master/HMaster.java    |   4 +-
 .../apache/hadoop/hbase/master/LoadBalancer.java   |  49 +---
 .../hbase/master/assignment/AssignmentManager.java |   6 +-
 .../apache/hadoop/hbase/rsgroup/RSGroupAdmin.java  |  23 --
 .../hadoop/hbase/rsgroup/RSGroupAdminClient.java   |  13 +-
 .../hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java | 152 ++++------
 .../hadoop/hbase/rsgroup/RSGroupAdminServer.java   | 326 ++++++---------------
 .../hbase/rsgroup/RSGroupAdminServiceImpl.java     | 111 +++++--
 .../hbase/rsgroup/RSGroupBasedLoadBalancer.java    |  97 +++---
 .../hadoop/hbase/rsgroup/RSGroupInfoManager.java   |  23 --
 .../hbase/rsgroup/RSGroupInfoManagerImpl.java      | 115 +-------
 .../apache/hadoop/hbase/rsgroup/RSGroupUtil.java   | 113 +++++++
 .../hadoop/hbase/master/TestRegionPlacement2.java  |   6 +-
 .../balancer/RSGroupableBalancerTestBase.java      |  84 +++---
 .../balancer/TestRSGroupBasedLoadBalancer.java     |  42 ++-
 ...lancerWithStochasticLoadBalancerAsInternal.java |   4 +-
 .../hadoop/hbase/rsgroup/TestRSGroupsAdmin1.java   |   1 -
 .../hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java   |  74 +----
 .../hadoop/hbase/rsgroup/TestRSGroupsBalance.java  |  20 +-
 .../hadoop/hbase/rsgroup/TestRSGroupsBase.java     |   8 +-
 .../hbase/rsgroup/TestRSGroupsOfflineMode.java     |   6 +-
 .../hbase/rsgroup/VerifyingRSGroupAdminClient.java |  67 +++--
 26 files changed, 610 insertions(+), 809 deletions(-)

diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/HTableDescriptor.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/HTableDescriptor.java
index 8866eba..188bed6 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/HTableDescriptor.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/HTableDescriptor.java
@@ -23,6 +23,7 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
@@ -987,4 +988,9 @@ public class HTableDescriptor implements TableDescriptor, Comparable<HTableDescr
   protected ModifyableTableDescriptor getDelegateeForModification() {
     return delegatee;
   }
+
+  @Override
+  public Optional<String> getRegionServerGroup() {
+    return delegatee.getRegionServerGroup();
+  }
 }
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptor.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptor.java
index fc5e69e..a452387 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptor.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptor.java
@@ -23,6 +23,7 @@ import java.util.Collection;
 import java.util.Comparator;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Stream;
 import org.apache.hadoop.hbase.HConstants;
@@ -184,6 +185,13 @@ public interface TableDescriptor {
   String getOwnerString();
 
   /**
+   * Get the region server group this table belongs to. The regions of this table will be placed
+   * only on the region servers within this group. If not present, will be placed on
+   * {@link org.apache.hadoop.hbase.rsgroup.RSGroupInfo#DEFAULT_GROUP}.
+   */
+  Optional<String> getRegionServerGroup();
+
+  /**
    * Getter for accessing the metadata associated with the key.
    *
    * @param key The key.
diff --git a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
index 037a7f8..09ee0c5 100644
--- a/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
+++ b/hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorBuilder.java
@@ -39,6 +39,7 @@ import org.apache.hadoop.hbase.Coprocessor;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.exceptions.DeserializationException;
+import org.apache.hadoop.hbase.rsgroup.RSGroupInfo;
 import org.apache.hadoop.hbase.security.User;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.yetus.audience.InterfaceAudience;
@@ -188,6 +189,9 @@ public class TableDescriptorBuilder {
   private static final Bytes PRIORITY_KEY
           = new Bytes(Bytes.toBytes(PRIORITY));
 
+  private static final Bytes RSGROUP_KEY =
+      new Bytes(Bytes.toBytes(RSGroupInfo.TABLE_DESC_PROP_GROUP));
+
   /**
    * Relative priority of the table used for rpc scheduling
    */
@@ -537,6 +541,11 @@ public class TableDescriptorBuilder {
     return this;
   }
 
+  public TableDescriptorBuilder setRegionServerGroup(String group) {
+    desc.setValue(RSGROUP_KEY, new Bytes(Bytes.toBytes(group)));
+    return this;
+  }
+
   public TableDescriptor build() {
     return new ModifyableTableDescriptor(desc);
   }
@@ -1577,6 +1586,16 @@ public class TableDescriptorBuilder {
     public int getColumnFamilyCount() {
       return families.size();
     }
+
+    @Override
+    public Optional<String> getRegionServerGroup() {
+      Bytes value = values.get(RSGROUP_KEY);
+      if (value != null) {
+        return Optional.of(Bytes.toString(value.get(), value.getOffset(), value.getLength()));
+      } else {
+        return Optional.empty();
+      }
+    }
   }
 
   private static Optional<CoprocessorDescriptor> toCoprocessorDescriptor(String spec) {
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfo.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfo.java
index 25e827d..ad55d1f 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfo.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfo.java
@@ -34,21 +34,38 @@ import org.apache.yetus.audience.InterfaceAudience;
 public class RSGroupInfo {
   public static final String DEFAULT_GROUP = "default";
   public static final String NAMESPACE_DESC_PROP_GROUP = "hbase.rsgroup.name";
+  public static final String TABLE_DESC_PROP_GROUP = "hbase.rsgroup.name";
 
   private final String name;
   // Keep servers in a sorted set so has an expected ordering when displayed.
   private final SortedSet<Address> servers;
   // Keep tables sorted too.
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
+   */
+  @Deprecated
   private final SortedSet<TableName> tables;
 
   public RSGroupInfo(String name) {
     this(name, new TreeSet<Address>(), new TreeSet<TableName>());
   }
 
+  RSGroupInfo(String name, SortedSet<Address> servers) {
+    this.name = name;
+    this.servers = servers == null ? new TreeSet<>() : new TreeSet<>(servers);
+    this.tables = new TreeSet<>();
+  }
+
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information for a table will be
+   *             stored in the configuration of a table so this will be removed.
+   */
+  @Deprecated
   RSGroupInfo(String name, SortedSet<Address> servers, SortedSet<TableName> tables) {
     this.name = name;
     this.servers = (servers == null) ? new TreeSet<>() : new TreeSet<>(servers);
-    this.tables  = (tables  == null) ? new TreeSet<>() : new TreeSet<>(tables);
+    this.tables = (tables == null) ? new TreeSet<>() : new TreeSet<>(tables);
   }
 
   public RSGroupInfo(RSGroupInfo src) {
@@ -100,23 +117,46 @@ public class RSGroupInfo {
 
   /**
    * Get set of tables that are members of the group.
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
    */
+  @Deprecated
   public SortedSet<TableName> getTables() {
     return tables;
   }
 
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
+   */
+  @Deprecated
   public void addTable(TableName table) {
     tables.add(table);
   }
 
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
+   */
+  @Deprecated
   public void addAllTables(Collection<TableName> arg) {
     tables.addAll(arg);
   }
 
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
+   */
+  @Deprecated
   public boolean containsTable(TableName table) {
     return tables.contains(table);
   }
 
+  /**
+   * @deprecated Since 3.0.0, will be removed in 4.0.0. The rsgroup information will be stored in
+   *             the configuration of a table so this will be removed.
+   */
+  @Deprecated
   public boolean removeTable(TableName table) {
     return tables.remove(table);
   }
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
index bb2aadb..79ed260 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
@@ -1963,7 +1963,7 @@ public class HMaster extends HRegionServer implements MasterServices {
   // Replace with an async implementation from which you can get
   // a success/failure result.
   @VisibleForTesting
-  public void move(final byte[] encodedRegionName, byte[] destServerName) throws HBaseIOException {
+  public void move(final byte[] encodedRegionName, byte[] destServerName) throws IOException {
     RegionState regionState = assignmentManager.getRegionStates().
       getRegionState(Bytes.toString(encodedRegionName));
 
@@ -3557,7 +3557,7 @@ public class HMaster extends HRegionServer implements MasterServices {
    * @param servers Region servers to decommission.
    */
   public void decommissionRegionServers(final List<ServerName> servers, final boolean offload)
-      throws HBaseIOException {
+      throws IOException {
     List<ServerName> serversAdded = new ArrayList<>(servers.size());
     // Place the decommission marker first.
     String parentZnode = getZooKeeper().getZNodePaths().drainingZNode;
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java
index 816636f..0fc544a 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/LoadBalancer.java
@@ -19,12 +19,12 @@
 package org.apache.hadoop.hbase.master;
 
 import edu.umd.cs.findbugs.annotations.Nullable;
+import java.io.IOException;
 import java.util.List;
 import java.util.Map;
 import org.apache.hadoop.conf.Configurable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.ClusterMetrics;
-import org.apache.hadoop.hbase.HBaseIOException;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.Stoppable;
 import org.apache.hadoop.hbase.TableName;
@@ -65,95 +65,72 @@ public interface LoadBalancer extends Configurable, Stoppable, ConfigurationObse
   ServerName BOGUS_SERVER_NAME = ServerName.valueOf("localhost,1,1");
 
   /**
-   * Set the current cluster status.  This allows a LoadBalancer to map host name to a server
-   * @param st
+   * Set the current cluster status. This allows a LoadBalancer to map host name to a server
    */
   void setClusterMetrics(ClusterMetrics st);
 
   /**
    * Pass RegionStates and allow balancer to set the current cluster load.
-   * @param ClusterLoad
    */
   void setClusterLoad(Map<TableName, Map<ServerName, List<RegionInfo>>> ClusterLoad);
 
   /**
    * Set the master service.
-   * @param masterServices
    */
   void setMasterServices(MasterServices masterServices);
 
   /**
    * Perform the major balance operation
-   * @param tableName
-   * @param clusterState
    * @return List of plans
    */
-  List<RegionPlan> balanceCluster(TableName tableName, Map<ServerName,
-      List<RegionInfo>> clusterState) throws HBaseIOException;
+  List<RegionPlan> balanceCluster(TableName tableName,
+      Map<ServerName, List<RegionInfo>> clusterState) throws IOException;
 
   /**
    * Perform the major balance operation
-   * @param clusterState
    * @return List of plans
    */
-  List<RegionPlan> balanceCluster(Map<ServerName,
-      List<RegionInfo>> clusterState) throws HBaseIOException;
+  List<RegionPlan> balanceCluster(Map<ServerName, List<RegionInfo>> clusterState)
+      throws IOException;
 
   /**
    * Perform a Round Robin assignment of regions.
-   * @param regions
-   * @param servers
    * @return Map of servername to regioninfos
    */
-  Map<ServerName, List<RegionInfo>> roundRobinAssignment(
-    List<RegionInfo> regions,
-    List<ServerName> servers
-  ) throws HBaseIOException;
+  Map<ServerName, List<RegionInfo>> roundRobinAssignment(List<RegionInfo> regions,
+      List<ServerName> servers) throws IOException;
 
   /**
    * Assign regions to the previously hosting region server
-   * @param regions
-   * @param servers
    * @return List of plans
    */
   @Nullable
-  Map<ServerName, List<RegionInfo>> retainAssignment(
-    Map<RegionInfo, ServerName> regions,
-    List<ServerName> servers
-  ) throws HBaseIOException;
+  Map<ServerName, List<RegionInfo>> retainAssignment(Map<RegionInfo, ServerName> regions,
+      List<ServerName> servers) throws IOException;
 
   /**
    * Get a random region server from the list
    * @param regionInfo Region for which this selection is being done.
-   * @param servers
-   * @return Servername
    */
-  ServerName randomAssignment(
-    RegionInfo regionInfo, List<ServerName> servers
-  ) throws HBaseIOException;
+  ServerName randomAssignment(RegionInfo regionInfo, List<ServerName> servers) throws IOException;
 
   /**
    * Initialize the load balancer. Must be called after setters.
-   * @throws HBaseIOException
    */
-  void initialize() throws HBaseIOException;
+  void initialize() throws IOException;
 
   /**
    * Marks the region as online at balancer.
-   * @param regionInfo
-   * @param sn
    */
   void regionOnline(RegionInfo regionInfo, ServerName sn);
 
   /**
    * Marks the region as offline at balancer.
-   * @param regionInfo
    */
   void regionOffline(RegionInfo regionInfo);
 
-  /*
+  /**
    * Notification that config has changed
-   * @param conf
    */
   @Override
   void onConfigurationChange(Configuration conf);
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
index a231fac..24ad0d9 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java
@@ -683,7 +683,7 @@ public class AssignmentManager {
         this.master.getServerManager().createDestinationServersList(serversToExclude));
       // Return mid-method!
       return createAssignProcedures(assignments);
-    } catch (HBaseIOException hioe) {
+    } catch (IOException hioe) {
       LOG.warn("Failed roundRobinAssignment", hioe);
     }
     // If an error above, fall-through to this simpler assign. Last resort.
@@ -1986,7 +1986,7 @@ public class AssignmentManager {
       }
       try {
         acceptPlan(regions, balancer.retainAssignment(retainMap, servers));
-      } catch (HBaseIOException e) {
+      } catch (IOException e) {
         LOG.warn("unable to retain assignment", e);
         addToPendingAssignment(regions, retainMap.keySet());
       }
@@ -2001,7 +2001,7 @@ public class AssignmentManager {
       }
       try {
         acceptPlan(regions, balancer.roundRobinAssignment(hris, servers));
-      } catch (HBaseIOException e) {
+      } catch (IOException e) {
         LOG.warn("unable to round-robin assignment", e);
         addToPendingAssignment(regions, hris);
       }
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdmin.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdmin.java
index 9ea996b..344d0b3 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdmin.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdmin.java
@@ -20,8 +20,6 @@ package org.apache.hadoop.hbase.rsgroup;
 import java.io.IOException;
 import java.util.List;
 import java.util.Set;
-
-import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.net.Address;
 import org.apache.yetus.audience.InterfaceAudience;
 
@@ -36,22 +34,11 @@ public interface RSGroupAdmin {
   RSGroupInfo getRSGroupInfo(String groupName) throws IOException;
 
   /**
-   * Gets {@code RSGroupInfo} for the given table's group.
-   */
-  RSGroupInfo getRSGroupInfoOfTable(TableName tableName) throws IOException;
-
-  /**
    * Move given set of servers to the specified target RegionServer group.
    */
   void moveServers(Set<Address> servers, String targetGroup) throws IOException;
 
   /**
-   * Move given set of tables to the specified target RegionServer group.
-   * This will unassign all of a table's region so it can be reassigned to the correct group.
-   */
-  void moveTables(Set<TableName> tables, String targetGroup) throws IOException;
-
-  /**
    * Creates a new RegionServer group with the given name.
    */
   void addRSGroup(String groupName) throws IOException;
@@ -80,16 +67,6 @@ public interface RSGroupAdmin {
   RSGroupInfo getRSGroupOfServer(Address hostPort) throws IOException;
 
   /**
-   * Move given set of servers and tables to the specified target RegionServer group.
-   * @param servers set of servers to move
-   * @param tables set of tables to move
-   * @param targetGroup the target group name
-   * @throws IOException if moving the server and tables fail
-   */
-  void moveServersAndTables(Set<Address> servers, Set<TableName> tables,
-                            String targetGroup) throws IOException;
-
-  /**
    * Remove decommissioned servers from rsgroup.
    * 1. Sometimes we may find the server aborted due to some hardware failure and we must offline
    * the server for repairing. Or we need to move some servers to join other clusters.
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminClient.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminClient.java
index e7ab7f2..07f0efd 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminClient.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminClient.java
@@ -47,6 +47,7 @@ import org.apache.hadoop.hbase.protobuf.generated.RSGroupAdminProtos.RemoveServe
 import org.apache.hadoop.hbase.protobuf.generated.RSGroupProtos;
 import org.apache.yetus.audience.InterfaceAudience;
 
+import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
 import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
 
 /**
@@ -62,12 +63,17 @@ public class RSGroupAdminClient implements RSGroupAdmin {
     stub = RSGroupAdminService.newBlockingStub(admin.coprocessorService());
   }
 
+  // for writing UTs
+  @VisibleForTesting
+  protected RSGroupAdminClient() {
+  }
+
   @Override
   public RSGroupInfo getRSGroupInfo(String groupName) throws IOException {
     try {
       GetRSGroupInfoResponse resp = stub.getRSGroupInfo(null,
-          GetRSGroupInfoRequest.newBuilder().setRSGroupName(groupName).build());
-      if(resp.hasRSGroupInfo()) {
+        GetRSGroupInfoRequest.newBuilder().setRSGroupName(groupName).build());
+      if (resp.hasRSGroupInfo()) {
         return ProtobufUtil.toGroupInfo(resp.getRSGroupInfo());
       }
       return null;
@@ -76,7 +82,6 @@ public class RSGroupAdminClient implements RSGroupAdmin {
     }
   }
 
-  @Override
   public RSGroupInfo getRSGroupInfoOfTable(TableName tableName) throws IOException {
     GetRSGroupInfoOfTableRequest request = GetRSGroupInfoOfTableRequest.newBuilder().setTableName(
         ProtobufUtil.toProtoTableName(tableName)).build();
@@ -111,7 +116,6 @@ public class RSGroupAdminClient implements RSGroupAdmin {
     }
   }
 
-  @Override
   public void moveTables(Set<TableName> tables, String targetGroup) throws IOException {
     MoveTablesRequest.Builder builder = MoveTablesRequest.newBuilder().setTargetGroup(targetGroup);
     for(TableName tableName: tables) {
@@ -192,7 +196,6 @@ public class RSGroupAdminClient implements RSGroupAdmin {
     }
   }
 
-  @Override
   public void moveServersAndTables(Set<Address> servers, Set<TableName> tables, String targetGroup)
       throws IOException {
     MoveServersAndTablesRequest.Builder builder =
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java
index 2d5af04..3c4530f 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminEndpoint.java
@@ -27,13 +27,10 @@ import java.util.stream.Collectors;
 import org.apache.hadoop.hbase.CoprocessorEnvironment;
 import org.apache.hadoop.hbase.HBaseIOException;
 import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.MasterNotRunningException;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
-import org.apache.hadoop.hbase.PleaseHoldException;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.RegionInfo;
-import org.apache.hadoop.hbase.client.SnapshotDescription;
 import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.constraint.ConstraintException;
 import org.apache.hadoop.hbase.coprocessor.CoreCoprocessor;
@@ -47,21 +44,16 @@ import org.apache.hadoop.hbase.net.Address;
 import org.apache.hadoop.hbase.security.UserProvider;
 import org.apache.hadoop.hbase.security.access.AccessChecker;
 import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
-import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
 
 // TODO: Encapsulate MasterObserver functions into separate subclass.
 @CoreCoprocessor
 @InterfaceAudience.Private
 public class RSGroupAdminEndpoint implements MasterCoprocessor, MasterObserver {
-  static final Logger LOG = LoggerFactory.getLogger(RSGroupAdminEndpoint.class);
-
-  private MasterServices master;
   // Only instance of RSGroupInfoManager. RSGroup aware load balancers ask for this instance on
   // their setup.
+  private MasterServices master;
   private RSGroupInfoManager groupInfoManager;
   private RSGroupAdminServer groupAdminServer;
   private RSGroupAdminServiceImpl groupAdminService = new RSGroupAdminServiceImpl();
@@ -110,117 +102,91 @@ public class RSGroupAdminEndpoint implements MasterCoprocessor, MasterObserver {
     return groupAdminService;
   }
 
-  private void assignTableToGroup(TableDescriptor desc) throws IOException {
-    String groupName =
-        master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
-            .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
-    if (groupName == null) {
-      groupName = RSGroupInfo.DEFAULT_GROUP;
-    }
-    RSGroupInfo rsGroupInfo = groupAdminServer.getRSGroupInfo(groupName);
-    if (rsGroupInfo == null) {
-      throw new ConstraintException(
-          "Default RSGroup (" + groupName + ") for this table's namespace does not exist.");
-    }
-    if (!rsGroupInfo.containsTable(desc.getTableName())) {
-      LOG.debug("Pre-moving table " + desc.getTableName() + " to RSGroup " + groupName);
-      groupAdminServer.moveTables(Sets.newHashSet(desc.getTableName()), groupName);
-    }
-  }
-
   /////////////////////////////////////////////////////////////////////////////
   // MasterObserver overrides
   /////////////////////////////////////////////////////////////////////////////
 
-  private boolean rsgroupHasServersOnline(TableDescriptor desc) throws IOException {
-    String groupName;
-    try {
-      groupName = master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString())
-          .getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
-      if (groupName == null) {
-        groupName = RSGroupInfo.DEFAULT_GROUP;
-      }
-    } catch (MasterNotRunningException | PleaseHoldException e) {
-      LOG.info("Master has not initialized yet; temporarily using default RSGroup '" +
-          RSGroupInfo.DEFAULT_GROUP + "' for deploy of system table");
-      groupName = RSGroupInfo.DEFAULT_GROUP;
+  @Override
+  public void postClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
+      List<ServerName> servers, List<ServerName> notClearedServers) throws IOException {
+    Set<Address> clearedServer =
+        servers.stream().filter(server -> !notClearedServers.contains(server))
+            .map(ServerName::getAddress).collect(Collectors.toSet());
+    if (!clearedServer.isEmpty()) {
+      groupAdminServer.removeServers(clearedServer);
     }
+  }
 
-    RSGroupInfo rsGroupInfo = groupAdminServer.getRSGroupInfo(groupName);
-    if (rsGroupInfo == null) {
-      throw new ConstraintException(
-          "Default RSGroup (" + groupName + ") for this table's " + "namespace does not exist.");
+  private void checkGroupExists(Optional<String> optGroupName) throws IOException {
+    if (optGroupName.isPresent()) {
+      String groupName = optGroupName.get();
+      if (groupAdminServer.getRSGroupInfo(groupName) == null) {
+        throw new ConstraintException("Region server group " + groupName + " does not exit");
+      }
     }
+  }
 
-    for (ServerName onlineServer : master.getServerManager().createDestinationServersList()) {
-      if (rsGroupInfo.getServers().contains(onlineServer.getAddress())) {
+  private boolean rsgroupHasServersOnline(TableDescriptor desc) throws IOException {
+    RSGroupInfo rsGroupInfo;
+    Optional<String> optGroupName = desc.getRegionServerGroup();
+    if (optGroupName.isPresent()) {
+      String groupName = optGroupName.get();
+      if (groupName.equals(RSGroupInfo.DEFAULT_GROUP)) {
+        // do not check for default group
+        return true;
+      }
+      rsGroupInfo = groupAdminServer.getRSGroupInfo(groupName);
+      if (rsGroupInfo == null) {
+        throw new ConstraintException(
+            "RSGroup " + groupName + " for table " + desc.getTableName() + " does not exist");
+      }
+    } else {
+      NamespaceDescriptor nd =
+          master.getClusterSchema().getNamespace(desc.getTableName().getNamespaceAsString());
+      String groupNameOfNs = nd.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
+      if (groupNameOfNs == null || groupNameOfNs.equals(RSGroupInfo.DEFAULT_GROUP)) {
+        // do not check for default group
         return true;
       }
+      rsGroupInfo = groupAdminServer.getRSGroupInfo(groupNameOfNs);
+      if (rsGroupInfo == null) {
+        throw new ConstraintException("RSGroup " + groupNameOfNs + " for table " +
+            desc.getTableName() + "(inherit from namespace) does not exist");
+      }
     }
-    return false;
+    return master.getServerManager().createDestinationServersList().stream()
+        .anyMatch(onlineServer -> rsGroupInfo.containsServer(onlineServer.getAddress()));
   }
 
   @Override
-  public void preCreateTableAction(final ObserverContext<MasterCoprocessorEnvironment> ctx,
-      final TableDescriptor desc, final RegionInfo[] regions) throws IOException {
+  public void preCreateTableAction(ObserverContext<MasterCoprocessorEnvironment> ctx,
+      TableDescriptor desc, RegionInfo[] regions) throws IOException {
+    checkGroupExists(desc.getRegionServerGroup());
     if (!desc.getTableName().isSystemTable() && !rsgroupHasServersOnline(desc)) {
-      throw new HBaseIOException("No online servers in the rsgroup, which table " +
-          desc.getTableName().getNameAsString() + " belongs to");
+      throw new HBaseIOException("No online servers in the rsgroup for " + desc);
     }
   }
 
-  // Assign table to default RSGroup.
-  @Override
-  public void postCreateTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
-      TableDescriptor desc, RegionInfo[] regions) throws IOException {
-    assignTableToGroup(desc);
-  }
-
-  // Remove table from its RSGroup.
   @Override
-  public void postDeleteTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
-      TableName tableName) throws IOException {
-    try {
-      RSGroupInfo group = groupAdminServer.getRSGroupInfoOfTable(tableName);
-      if (group != null) {
-        LOG.debug(String.format("Removing deleted table '%s' from rsgroup '%s'", tableName,
-          group.getName()));
-        groupAdminServer.moveTables(Sets.newHashSet(tableName), null);
-      }
-    } catch (IOException ex) {
-      LOG.debug("Failed to perform RSGroup information cleanup for table: " + tableName, ex);
-    }
+  public TableDescriptor preModifyTable(ObserverContext<MasterCoprocessorEnvironment> ctx,
+      TableName tableName, TableDescriptor currentDescriptor, TableDescriptor newDescriptor)
+      throws IOException {
+    checkGroupExists(newDescriptor.getRegionServerGroup());
+    return MasterObserver.super.preModifyTable(ctx, tableName, currentDescriptor, newDescriptor);
   }
 
   @Override
   public void preCreateNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
       NamespaceDescriptor ns) throws IOException {
-    String group = ns.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
-    if (group != null && groupAdminServer.getRSGroupInfo(group) == null) {
-      throw new ConstraintException("Region server group " + group + " does not exit");
-    }
+    checkGroupExists(
+      Optional.ofNullable(ns.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP)));
   }
 
   @Override
   public void preModifyNamespace(ObserverContext<MasterCoprocessorEnvironment> ctx,
-      NamespaceDescriptor currentNsDesc, NamespaceDescriptor newNsDesc) throws IOException {
-    preCreateNamespace(ctx, newNsDesc);
-  }
-
-  @Override
-  public void preCloneSnapshot(ObserverContext<MasterCoprocessorEnvironment> ctx,
-      SnapshotDescription snapshot, TableDescriptor desc) throws IOException {
-    assignTableToGroup(desc);
-  }
-
-  @Override
-  public void postClearDeadServers(ObserverContext<MasterCoprocessorEnvironment> ctx,
-      List<ServerName> servers, List<ServerName> notClearedServers) throws IOException {
-    Set<Address> clearedServer =
-        servers.stream().filter(server -> !notClearedServers.contains(server))
-            .map(ServerName::getAddress).collect(Collectors.toSet());
-    if (!clearedServer.isEmpty()) {
-      groupAdminServer.removeServers(clearedServer);
-    }
+      NamespaceDescriptor currentNsDescriptor, NamespaceDescriptor newNsDescriptor)
+      throws IOException {
+    checkGroupExists(Optional
+        .ofNullable(newNsDescriptor.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP)));
   }
 }
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java
index 0654b87..1b44713 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServer.java
@@ -26,15 +26,16 @@ import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.function.Function;
-
 import org.apache.commons.lang3.StringUtils;
 import org.apache.hadoop.hbase.DoNotRetryIOException;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.RegionInfo;
+import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.constraint.ConstraintException;
 import org.apache.hadoop.hbase.master.HMaster;
 import org.apache.hadoop.hbase.master.LoadBalancer;
@@ -42,7 +43,6 @@ import org.apache.hadoop.hbase.master.MasterServices;
 import org.apache.hadoop.hbase.master.RegionPlan;
 import org.apache.hadoop.hbase.master.RegionState;
 import org.apache.hadoop.hbase.master.ServerManager;
-import org.apache.hadoop.hbase.master.assignment.AssignmentManager;
 import org.apache.hadoop.hbase.master.assignment.RegionStateNode;
 import org.apache.hadoop.hbase.net.Address;
 import org.apache.yetus.audience.InterfaceAudience;
@@ -85,14 +85,6 @@ public class RSGroupAdminServer implements RSGroupAdmin {
     return rsGroupInfoManager.getRSGroup(groupName);
   }
 
-  @Override
-  public RSGroupInfo getRSGroupInfoOfTable(TableName tableName) throws IOException {
-    // We are reading across two Maps in the below with out synchronizing across
-    // them; should be safe most of the time.
-    String groupName = rsGroupInfoManager.getRSGroupOfTable(tableName);
-    return groupName == null? null: rsGroupInfoManager.getRSGroup(groupName);
-  }
-
   private void checkOnlineServersOnly(Set<Address> servers) throws ConstraintException {
     // This uglyness is because we only have Address, not ServerName.
     // Online servers are keyed by ServerName.
@@ -159,107 +151,24 @@ public class RSGroupAdminServer implements RSGroupAdmin {
   }
 
   /**
-   * Check servers and tables.
-   *
-   * @param servers servers to move
-   * @param tables tables to move
-   * @param targetGroupName target group name
-   * @throws IOException if nulls or if servers and tables not belong to the same group
-   */
-  private void checkServersAndTables(Set<Address> servers, Set<TableName> tables,
-                                     String targetGroupName) throws IOException {
-    // Presume first server's source group. Later ensure all servers are from this group.
-    Address firstServer = servers.iterator().next();
-    RSGroupInfo tmpSrcGrp = rsGroupInfoManager.getRSGroupOfServer(firstServer);
-    if (tmpSrcGrp == null) {
-      // Be careful. This exception message is tested for in TestRSGroupsBase...
-      throw new ConstraintException("Source RSGroup for server " + firstServer
-              + " does not exist.");
-    }
-    RSGroupInfo srcGrp = new RSGroupInfo(tmpSrcGrp);
-    if (srcGrp.getName().equals(targetGroupName)) {
-      throw new ConstraintException("Target RSGroup " + targetGroupName +
-              " is same as source " + srcGrp.getName() + " RSGroup.");
-    }
-    // Only move online servers
-    checkOnlineServersOnly(servers);
-
-    // Ensure all servers are of same rsgroup.
-    for (Address server: servers) {
-      String tmpGroup = rsGroupInfoManager.getRSGroupOfServer(server).getName();
-      if (!tmpGroup.equals(srcGrp.getName())) {
-        throw new ConstraintException("Move server request should only come from one source " +
-                "RSGroup. Expecting only " + srcGrp.getName() + " but contains " + tmpGroup);
-      }
-    }
-
-    // Ensure all tables and servers are of same rsgroup.
-    for (TableName table : tables) {
-      String tmpGroup = rsGroupInfoManager.getRSGroupOfTable(table);
-      if (!tmpGroup.equals(srcGrp.getName())) {
-        throw new ConstraintException("Move table request should only come from one source " +
-                "RSGroup. Expecting only " + srcGrp.getName() + " but contains " + tmpGroup);
-      }
-    }
-
-    if (srcGrp.getServers().size() <= servers.size() && srcGrp.getTables().size() > tables.size()) {
-      throw new ConstraintException("Cannot leave a RSGroup " + srcGrp.getName() +
-              " that contains tables without servers to host them.");
-    }
-  }
-
-  /**
-   * Move every region from servers which are currently located on these servers,
-   * but should not be located there.
-   *
+   * Move every region from servers which are currently located on these servers, but should not be
+   * located there.
    * @param servers the servers that will move to new group
    * @param targetGroupName the target group name
    * @throws IOException if moving the server and tables fail
    */
   private void moveServerRegionsFromGroup(Set<Address> servers, String targetGroupName)
     throws IOException {
-    moveRegionsBetweenGroups(servers, targetGroupName,
-      rs -> getRegions(rs),
-      info -> {
-        try {
-          RSGroupInfo group = getRSGroupInfo(targetGroupName);
-          return group.containsTable(info.getTable());
-        } catch (IOException e) {
-          e.printStackTrace();
-          return false;
-        }
-      },
-      rs -> rs.getHostname());
-  }
-
-  /**
-   * Moves regions of tables which are not on target group servers.
-   *
-   * @param tables the tables that will move to new group
-   * @param targetGroupName the target group name
-   * @throws IOException if moving the region fails
-   */
-  private void moveTableRegionsToGroup(Set<TableName> tables, String targetGroupName)
-    throws IOException {
-    moveRegionsBetweenGroups(tables, targetGroupName,
-      table -> {
-        if (master.getAssignmentManager().isTableDisabled(table)) {
-          return new ArrayList<>();
-        }
-        return master.getAssignmentManager().getRegionStates().getRegionsOfTable(table);
-      },
-      info -> {
-        try {
-          RSGroupInfo group = getRSGroupInfo(targetGroupName);
-          ServerName sn =
-              master.getAssignmentManager().getRegionStates().getRegionServerOfRegion(info);
-          return group.containsServer(sn.getAddress());
-        } catch (IOException e) {
-          e.printStackTrace();
-          return false;
-        }
-      },
-      table -> table.getNameWithNamespaceInclAsString());
+    moveRegionsBetweenGroups(servers, targetGroupName, rs -> getRegions(rs), info -> {
+      try {
+        String groupName = RSGroupUtil.getRSGroupInfo(master, rsGroupInfoManager, info.getTable())
+          .map(RSGroupInfo::getName).orElse(RSGroupInfo.DEFAULT_GROUP);
+        return groupName.equals(targetGroupName);
+      } catch (IOException e) {
+        LOG.warn("Failed to test group for region {} and target group {}", info, targetGroupName);
+        return false;
+      }
+    }, rs -> rs.getHostname());
   }
 
   private <T> void moveRegionsBetweenGroups(Set<T> regionsOwners, String targetGroupName,
@@ -324,9 +233,6 @@ public class RSGroupAdminServer implements RSGroupAdmin {
     }
   }
 
-  @edu.umd.cs.findbugs.annotations.SuppressWarnings(
-      value="RCN_REDUNDANT_NULLCHECK_WOULD_HAVE_BEEN_A_NPE",
-      justification="Ignoring complaint because don't know what it is complaining about")
   @Override
   public void moveServers(Set<Address> servers, String targetGroupName) throws IOException {
     if (servers == null) {
@@ -353,7 +259,7 @@ public class RSGroupAdminServer implements RSGroupAdmin {
       }
       if (srcGrp.getName().equals(targetGroupName)) {
         throw new ConstraintException("Target RSGroup " + targetGroupName +
-            " is same as source " + srcGrp + " RSGroup.");
+            " is same as source " + srcGrp.getName() + " RSGroup.");
       }
       // Only move online servers (when moving from 'default') or servers from other
       // groups. This prevents bogus servers from entering groups
@@ -371,9 +277,16 @@ public class RSGroupAdminServer implements RSGroupAdmin {
               "RSGroup. Expecting only " + srcGrp.getName() + " but contains " + tmpGroup);
         }
       }
-      if (srcGrp.getServers().size() <= servers.size() && srcGrp.getTables().size() > 0) {
-        throw new ConstraintException("Cannot leave a RSGroup " + srcGrp.getName() +
-            " that contains tables without servers to host them.");
+      if (srcGrp.getServers().size() <= servers.size()) {
+        // check if there are still tables reference this group
+        for (TableDescriptor td : master.getTableDescriptors().getAll().values()) {
+          Optional<String> optGroupName = td.getRegionServerGroup();
+          if (optGroupName.isPresent() && optGroupName.get().equals(srcGrp.getName())) {
+            throw new ConstraintException(
+                "Cannot leave a RSGroup " + srcGrp.getName() + " that contains tables('" +
+                    td.getTableName() + "' at least) without servers to host them.");
+          }
+        }
       }
 
       // MovedServers may be < passed in 'servers'.
@@ -385,48 +298,6 @@ public class RSGroupAdminServer implements RSGroupAdmin {
   }
 
   @Override
-  public void moveTables(Set<TableName> tables, String targetGroup) throws IOException {
-    if (tables == null) {
-      throw new ConstraintException("The list of servers cannot be null.");
-    }
-    if (tables.size() < 1) {
-      LOG.debug("moveTables() passed an empty set. Ignoring.");
-      return;
-    }
-
-    // Hold a lock on the manager instance while moving servers to prevent
-    // another writer changing our state while we are working.
-    synchronized (rsGroupInfoManager) {
-      if(targetGroup != null) {
-        RSGroupInfo destGroup = rsGroupInfoManager.getRSGroup(targetGroup);
-        if(destGroup == null) {
-          throw new ConstraintException("Target " + targetGroup + " RSGroup does not exist.");
-        }
-        if(destGroup.getServers().size() < 1) {
-          throw new ConstraintException("Target RSGroup must have at least one server.");
-        }
-      }
-
-      for (TableName table : tables) {
-        String srcGroup = rsGroupInfoManager.getRSGroupOfTable(table);
-        if(srcGroup != null && srcGroup.equals(targetGroup)) {
-          throw new ConstraintException(
-              "Source RSGroup " + srcGroup + " is same as target " + targetGroup +
-              " RSGroup for table " + table);
-        }
-        LOG.info("Moving table {} to RSGroup {}", table.getNameAsString(), targetGroup);
-      }
-      rsGroupInfoManager.moveTables(tables, targetGroup);
-
-      // targetGroup is null when a table is being deleted. In this case no further
-      // action is required.
-      if (targetGroup != null) {
-        moveTableRegionsToGroup(tables, targetGroup);
-      }
-    }
-  }
-
-  @Override
   public void addRSGroup(String name) throws IOException {
     rsGroupInfoManager.addRSGroup(new RSGroupInfo(name));
   }
@@ -440,17 +311,18 @@ public class RSGroupAdminServer implements RSGroupAdmin {
       if (rsGroupInfo == null) {
         throw new ConstraintException("RSGroup " + name + " does not exist");
       }
-      int tableCount = rsGroupInfo.getTables().size();
-      if (tableCount > 0) {
-        throw new ConstraintException("RSGroup " + name + " has " + tableCount +
-            " tables; you must remove these tables from the rsgroup before " +
-            "the rsgroup can be removed.");
-      }
       int serverCount = rsGroupInfo.getServers().size();
       if (serverCount > 0) {
         throw new ConstraintException("RSGroup " + name + " has " + serverCount +
-            " servers; you must remove these servers from the RSGroup before" +
-            "the RSGroup can be removed.");
+          " servers; you must remove these servers from the RSGroup before" +
+          " the RSGroup can be removed.");
+      }
+      for (TableDescriptor td : master.getTableDescriptors().getAll().values()) {
+        if (td.getRegionServerGroup().map(name::equals).orElse(false)) {
+          throw new ConstraintException("RSGroup " + name + " is already referenced by " +
+            td.getTableName() + "; you must remove all the tables from the rsgroup before " +
+            "the rsgroup can be removed.");
+        }
       }
       for (NamespaceDescriptor ns : master.getClusterSchema().getNamespaces()) {
         String nsGroup = ns.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
@@ -475,27 +347,29 @@ public class RSGroupAdminServer implements RSGroupAdmin {
       }
 
       if (getRSGroupInfo(groupName) == null) {
-        throw new ConstraintException("RSGroup does not exist: "+groupName);
+        throw new ConstraintException("RSGroup does not exist: " + groupName);
       }
       // Only allow one balance run at at time.
       Map<String, RegionState> groupRIT = rsGroupGetRegionsInTransition(groupName);
       if (groupRIT.size() > 0) {
         LOG.debug("Not running balancer because {} region(s) in transition: {}", groupRIT.size(),
-            StringUtils.abbreviate(
-              master.getAssignmentManager().getRegionStates().getRegionsInTransition().toString(),
-              256));
+          StringUtils.abbreviate(
+            master.getAssignmentManager().getRegionStates().getRegionsInTransition().toString(),
+            256));
         return false;
       }
       if (serverManager.areDeadServersInProgress()) {
         LOG.debug("Not running balancer because processing dead regionserver(s): {}",
-            serverManager.getDeadServers());
+          serverManager.getDeadServers());
         return false;
       }
 
-      //We balance per group instead of per table
+      // We balance per group instead of per table
       List<RegionPlan> plans = new ArrayList<>();
-      for(Map.Entry<TableName, Map<ServerName, List<RegionInfo>>> tableMap:
-          getRSGroupAssignmentsByTable(groupName).entrySet()) {
+      Map<TableName, Map<ServerName, List<RegionInfo>>> assignmentsByTable =
+        getRSGroupAssignmentsByTable(groupName);
+      for (Map.Entry<TableName, Map<ServerName, List<RegionInfo>>> tableMap : assignmentsByTable
+        .entrySet()) {
         LOG.info("Creating partial plan for table {} : {}", tableMap.getKey(), tableMap.getValue());
         List<RegionPlan> partialPlans = balancer.balanceCluster(tableMap.getValue());
         LOG.info("Partial plan for table {} : {}", tableMap.getKey(), partialPlans);
@@ -524,100 +398,66 @@ public class RSGroupAdminServer implements RSGroupAdmin {
   }
 
   @Override
-  public void moveServersAndTables(Set<Address> servers, Set<TableName> tables, String targetGroup)
-      throws IOException {
+  public void removeServers(Set<Address> servers) throws IOException {
     if (servers == null || servers.isEmpty()) {
-      throw new ConstraintException("The list of servers to move cannot be null or empty.");
-    }
-    if (tables == null || tables.isEmpty()) {
-      throw new ConstraintException("The list of tables to move cannot be null or empty.");
+      throw new ConstraintException("The set of servers to remove cannot be null or empty.");
     }
-
-    //check target group
-    getAndCheckRSGroupInfo(targetGroup);
-
-    // Hold a lock on the manager instance while moving servers and tables to prevent
+    // Hold a lock on the manager instance while moving servers to prevent
     // another writer changing our state while we are working.
     synchronized (rsGroupInfoManager) {
-      //check servers and tables status
-      checkServersAndTables(servers, tables, targetGroup);
-
-      //Move servers and tables to a new group.
-      String srcGroup = getRSGroupOfServer(servers.iterator().next()).getName();
-      rsGroupInfoManager.moveServersAndTables(servers, tables, srcGroup, targetGroup);
-
-      //move regions on these servers which do not belong to group tables
-      moveServerRegionsFromGroup(servers, targetGroup);
-      //move regions of these tables which are not on group servers
-      moveTableRegionsToGroup(tables, targetGroup);
+      // check the set of servers
+      checkForDeadOrOnlineServers(servers);
+      rsGroupInfoManager.removeServers(servers);
+      LOG.info("Remove decommissioned servers {} from RSGroup done", servers);
     }
-    LOG.info("Move servers and tables done. Severs: {}, Tables: {} => {}", servers, tables,
-        targetGroup);
   }
 
-  @Override
-  public void removeServers(Set<Address> servers) throws IOException {
-    {
-      if (servers == null || servers.isEmpty()) {
-        throw new ConstraintException("The set of servers to remove cannot be null or empty.");
-      }
-      // Hold a lock on the manager instance while moving servers to prevent
-      // another writer changing our state while we are working.
-      synchronized (rsGroupInfoManager) {
-        //check the set of servers
-        checkForDeadOrOnlineServers(servers);
-        rsGroupInfoManager.removeServers(servers);
-        LOG.info("Remove decommissioned servers {} from RSGroup done", servers);
-      }
+  private boolean isTableInGroup(TableName tableName, String groupName,
+    Set<TableName> tablesInGroupCache) throws IOException {
+    if (tablesInGroupCache.contains(tableName)) {
+      return true;
     }
+    if (RSGroupUtil.getRSGroupInfo(master, rsGroupInfoManager, tableName).map(RSGroupInfo::getName)
+      .orElse(RSGroupInfo.DEFAULT_GROUP).equals(groupName)) {
+      tablesInGroupCache.add(tableName);
+      return true;
+    }
+    return false;
   }
 
   private Map<String, RegionState> rsGroupGetRegionsInTransition(String groupName)
-      throws IOException {
+    throws IOException {
     Map<String, RegionState> rit = Maps.newTreeMap();
-    AssignmentManager am = master.getAssignmentManager();
-    for(TableName tableName : getRSGroupInfo(groupName).getTables()) {
-      for(RegionInfo regionInfo: am.getRegionStates().getRegionsOfTable(tableName)) {
-        RegionState state = am.getRegionStates().getRegionTransitionState(regionInfo);
-        if(state != null) {
-          rit.put(regionInfo.getEncodedName(), state);
-        }
+    Set<TableName> tablesInGroupCache = new HashSet<>();
+    for (RegionStateNode regionNode : master.getAssignmentManager().getRegionsInTransition()) {
+      TableName tn = regionNode.getTable();
+      if (isTableInGroup(tn, groupName, tablesInGroupCache)) {
+        rit.put(regionNode.getRegionInfo().getEncodedName(), regionNode.toRegionState());
       }
     }
     return rit;
   }
 
   private Map<TableName, Map<ServerName, List<RegionInfo>>>
-      getRSGroupAssignmentsByTable(String groupName) throws IOException {
+    getRSGroupAssignmentsByTable(String groupName) throws IOException {
     Map<TableName, Map<ServerName, List<RegionInfo>>> result = Maps.newHashMap();
-    RSGroupInfo rsGroupInfo = getRSGroupInfo(groupName);
-    Map<TableName, Map<ServerName, List<RegionInfo>>> assignments = Maps.newHashMap();
-    for(Map.Entry<RegionInfo, ServerName> entry:
-        master.getAssignmentManager().getRegionStates().getRegionAssignments().entrySet()) {
-      TableName currTable = entry.getKey().getTable();
-      ServerName currServer = entry.getValue();
-      RegionInfo currRegion = entry.getKey();
-      if (rsGroupInfo.getTables().contains(currTable)) {
-        assignments.putIfAbsent(currTable, new HashMap<>());
-        assignments.get(currTable).putIfAbsent(currServer, new ArrayList<>());
-        assignments.get(currTable).get(currServer).add(currRegion);
+    Set<TableName> tablesInGroupCache = new HashSet<>();
+    for (Map.Entry<RegionInfo, ServerName> entry : master.getAssignmentManager().getRegionStates()
+      .getRegionAssignments().entrySet()) {
+      RegionInfo region = entry.getKey();
+      TableName tn = region.getTable();
+      ServerName server = entry.getValue();
+      if (isTableInGroup(tn, groupName, tablesInGroupCache)) {
+        result.computeIfAbsent(tn, k -> new HashMap<>())
+          .computeIfAbsent(server, k -> new ArrayList<>()).add(region);
       }
     }
-
-    Map<ServerName, List<RegionInfo>> serverMap = Maps.newHashMap();
-    for(ServerName serverName: master.getServerManager().getOnlineServers().keySet()) {
-      if(rsGroupInfo.getServers().contains(serverName.getAddress())) {
-        serverMap.put(serverName, Collections.emptyList());
-      }
-    }
-
-    // add all tables that are members of the group
-    for(TableName tableName : rsGroupInfo.getTables()) {
-      if(assignments.containsKey(tableName)) {
-        result.put(tableName, new HashMap<>());
-        result.get(tableName).putAll(serverMap);
-        result.get(tableName).putAll(assignments.get(tableName));
-        LOG.debug("Adding assignments for {}: {}", tableName, assignments.get(tableName));
+    RSGroupInfo rsGroupInfo = getRSGroupInfo(groupName);
+    for (ServerName serverName : master.getServerManager().getOnlineServers().keySet()) {
+      if (rsGroupInfo.containsServer(serverName.getAddress())) {
+        for (Map<ServerName, List<RegionInfo>> map : result.values()) {
+          map.computeIfAbsent(serverName, k -> Collections.emptyList());
+        }
       }
     }
 
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServiceImpl.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServiceImpl.java
index 918a4fe..6bc4519 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServiceImpl.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupAdminServiceImpl.java
@@ -20,14 +20,24 @@ package org.apache.hadoop.hbase.rsgroup;
 import com.google.protobuf.RpcCallback;
 import com.google.protobuf.RpcController;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
+import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
 import org.apache.hadoop.hbase.ipc.CoprocessorRpcUtils;
 import org.apache.hadoop.hbase.ipc.RpcServer;
 import org.apache.hadoop.hbase.master.MasterServices;
+import org.apache.hadoop.hbase.master.procedure.ProcedureSyncWait;
 import org.apache.hadoop.hbase.net.Address;
+import org.apache.hadoop.hbase.procedure2.Procedure;
 import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
 import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos;
 import org.apache.hadoop.hbase.protobuf.generated.RSGroupAdminProtos;
@@ -57,6 +67,8 @@ import org.apache.hadoop.hbase.security.User;
 import org.apache.hadoop.hbase.security.UserProvider;
 import org.apache.hadoop.hbase.security.access.AccessChecker;
 import org.apache.hadoop.hbase.security.access.Permission.Action;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
 import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
@@ -68,6 +80,8 @@ import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
  */
 class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
 
+  private static final Logger LOG = LoggerFactory.getLogger(RSGroupAdminServiceImpl.class);
+
   private MasterServices master;
 
   private RSGroupAdminServer groupAdminServer;
@@ -107,12 +121,17 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     return userProvider.getCurrent();
   }
 
+  // for backward compatible
+  private RSGroupInfo fillTables(RSGroupInfo rsGroupInfo) throws IOException {
+    return RSGroupUtil.fillTables(rsGroupInfo, master.getTableDescriptors().getAll().values());
+  }
+
   @Override
   public void getRSGroupInfo(RpcController controller, GetRSGroupInfoRequest request,
       RpcCallback<GetRSGroupInfoResponse> done) {
     GetRSGroupInfoResponse.Builder builder = GetRSGroupInfoResponse.newBuilder();
     String groupName = request.getRSGroupName();
-    RSGroupAdminEndpoint.LOG.info(
+    LOG.info(
       master.getClientIdAuditPrefix() + " initiates rsgroup info retrieval, group=" + groupName);
     try {
       if (master.getMasterCoprocessorHost() != null) {
@@ -121,7 +140,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
       checkPermission("getRSGroupInfo");
       RSGroupInfo rsGroupInfo = groupAdminServer.getRSGroupInfo(groupName);
       if (rsGroupInfo != null) {
-        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(rsGroupInfo));
+        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(fillTables(rsGroupInfo)));
       }
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postGetRSGroupInfo(groupName);
@@ -137,17 +156,24 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
       RpcCallback<GetRSGroupInfoOfTableResponse> done) {
     GetRSGroupInfoOfTableResponse.Builder builder = GetRSGroupInfoOfTableResponse.newBuilder();
     TableName tableName = ProtobufUtil.toTableName(request.getTableName());
-    RSGroupAdminEndpoint.LOG.info(
+    LOG.info(
       master.getClientIdAuditPrefix() + " initiates rsgroup info retrieval, table=" + tableName);
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preGetRSGroupInfoOfTable(tableName);
       }
       checkPermission("getRSGroupInfoOfTable");
-      RSGroupInfo RSGroupInfo = groupAdminServer.getRSGroupInfoOfTable(tableName);
-      if (RSGroupInfo != null) {
-        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(RSGroupInfo));
+      Optional<RSGroupInfo> optGroup =
+          RSGroupUtil.getRSGroupInfo(master, groupAdminServer, tableName);
+      if (optGroup.isPresent()) {
+        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(fillTables(optGroup.get())));
+      } else {
+        if (master.getTableStateManager().isTablePresent(tableName)) {
+          RSGroupInfo rsGroupInfo = groupAdminServer.getRSGroupInfo(RSGroupInfo.DEFAULT_GROUP);
+          builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(fillTables(rsGroupInfo)));
+        }
       }
+
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postGetRSGroupInfoOfTable(tableName);
       }
@@ -165,8 +191,8 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     for (HBaseProtos.ServerName el : request.getServersList()) {
       hostPorts.add(Address.fromParts(el.getHostName(), el.getPort()));
     }
-    RSGroupAdminEndpoint.LOG.info(master.getClientIdAuditPrefix() + " move servers " + hostPorts +
-        " to rsgroup " + request.getTargetGroup());
+    LOG.info(master.getClientIdAuditPrefix() + " move servers " + hostPorts + " to rsgroup " +
+        request.getTargetGroup());
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preMoveServers(hostPorts, request.getTargetGroup());
@@ -182,6 +208,27 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     done.run(builder.build());
   }
 
+  private void moveTablesAndWait(Set<TableName> tables, String targetGroup) throws IOException {
+    List<Long> procIds = new ArrayList<Long>();
+    for (TableName tableName : tables) {
+      TableDescriptor oldTd = master.getTableDescriptors().get(tableName);
+      if (oldTd == null) {
+        continue;
+      }
+      TableDescriptor newTd =
+          TableDescriptorBuilder.newBuilder(oldTd).setRegionServerGroup(targetGroup).build();
+      procIds.add(master.modifyTable(tableName, newTd, HConstants.NO_NONCE, HConstants.NO_NONCE));
+    }
+    for (long procId : procIds) {
+      Procedure<?> proc = master.getMasterProcedureExecutor().getProcedure(procId);
+      if (proc == null) {
+        continue;
+      }
+      ProcedureSyncWait.waitForProcedureToCompleteIOE(master.getMasterProcedureExecutor(), proc,
+        Long.MAX_VALUE);
+    }
+  }
+
   @Override
   public void moveTables(RpcController controller, MoveTablesRequest request,
       RpcCallback<MoveTablesResponse> done) {
@@ -190,14 +237,14 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     for (HBaseProtos.TableName tableName : request.getTableNameList()) {
       tables.add(ProtobufUtil.toTableName(tableName));
     }
-    RSGroupAdminEndpoint.LOG.info(master.getClientIdAuditPrefix() + " move tables " + tables +
-        " to rsgroup " + request.getTargetGroup());
+    LOG.info(master.getClientIdAuditPrefix() + " move tables " + tables + " to rsgroup " +
+        request.getTargetGroup());
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preMoveTables(tables, request.getTargetGroup());
       }
       checkPermission("moveTables");
-      groupAdminServer.moveTables(tables, request.getTargetGroup());
+      moveTablesAndWait(tables, request.getTargetGroup());
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postMoveTables(tables, request.getTargetGroup());
       }
@@ -211,8 +258,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
   public void addRSGroup(RpcController controller, AddRSGroupRequest request,
       RpcCallback<AddRSGroupResponse> done) {
     AddRSGroupResponse.Builder builder = AddRSGroupResponse.newBuilder();
-    RSGroupAdminEndpoint.LOG
-        .info(master.getClientIdAuditPrefix() + " add rsgroup " + request.getRSGroupName());
+    LOG.info(master.getClientIdAuditPrefix() + " add rsgroup " + request.getRSGroupName());
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preAddRSGroup(request.getRSGroupName());
@@ -232,8 +278,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
   public void removeRSGroup(RpcController controller, RemoveRSGroupRequest request,
       RpcCallback<RemoveRSGroupResponse> done) {
     RemoveRSGroupResponse.Builder builder = RemoveRSGroupResponse.newBuilder();
-    RSGroupAdminEndpoint.LOG
-        .info(master.getClientIdAuditPrefix() + " remove rsgroup " + request.getRSGroupName());
+    LOG.info(master.getClientIdAuditPrefix() + " remove rsgroup " + request.getRSGroupName());
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preRemoveRSGroup(request.getRSGroupName());
@@ -253,7 +298,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
   public void balanceRSGroup(RpcController controller, BalanceRSGroupRequest request,
       RpcCallback<BalanceRSGroupResponse> done) {
     BalanceRSGroupResponse.Builder builder = BalanceRSGroupResponse.newBuilder();
-    RSGroupAdminEndpoint.LOG.info(
+    LOG.info(
       master.getClientIdAuditPrefix() + " balance rsgroup, group=" + request.getRSGroupName());
     try {
       if (master.getMasterCoprocessorHost() != null) {
@@ -276,14 +321,28 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
   public void listRSGroupInfos(RpcController controller, ListRSGroupInfosRequest request,
       RpcCallback<ListRSGroupInfosResponse> done) {
     ListRSGroupInfosResponse.Builder builder = ListRSGroupInfosResponse.newBuilder();
-    RSGroupAdminEndpoint.LOG.info(master.getClientIdAuditPrefix() + " list rsgroup");
+    LOG.info(master.getClientIdAuditPrefix() + " list rsgroup");
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preListRSGroups();
       }
       checkPermission("listRSGroup");
-      for (RSGroupInfo RSGroupInfo : groupAdminServer.listRSGroups()) {
-        builder.addRSGroupInfo(ProtobufUtil.toProtoGroupInfo(RSGroupInfo));
+      List<RSGroupInfo> rsGroupInfos = groupAdminServer.listRSGroups().stream()
+          .map(RSGroupInfo::new).collect(Collectors.toList());
+      Map<String, RSGroupInfo> name2Info = new HashMap<>();
+      for (RSGroupInfo rsGroupInfo : rsGroupInfos) {
+        name2Info.put(rsGroupInfo.getName(), rsGroupInfo);
+      }
+      for (TableDescriptor td : master.getTableDescriptors().getAll().values()) {
+        String groupName = td.getRegionServerGroup().orElse(RSGroupInfo.DEFAULT_GROUP);
+        RSGroupInfo rsGroupInfo = name2Info.get(groupName);
+        if (rsGroupInfo != null) {
+          rsGroupInfo.addTable(td.getTableName());
+        }
+      }
+      for (RSGroupInfo rsGroupInfo : rsGroupInfos) {
+        // TODO: this can be done at once outside this loop, do not need to scan all every time.
+        builder.addRSGroupInfo(ProtobufUtil.toProtoGroupInfo(rsGroupInfo));
       }
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postListRSGroups();
@@ -300,8 +359,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     GetRSGroupInfoOfServerResponse.Builder builder = GetRSGroupInfoOfServerResponse.newBuilder();
     Address hp =
         Address.fromParts(request.getServer().getHostName(), request.getServer().getPort());
-    RSGroupAdminEndpoint.LOG
-        .info(master.getClientIdAuditPrefix() + " initiates rsgroup info retrieval, server=" + hp);
+    LOG.info(master.getClientIdAuditPrefix() + " initiates rsgroup info retrieval, server=" + hp);
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preGetRSGroupInfoOfServer(hp);
@@ -309,7 +367,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
       checkPermission("getRSGroupInfoOfServer");
       RSGroupInfo info = groupAdminServer.getRSGroupOfServer(hp);
       if (info != null) {
-        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(info));
+        builder.setRSGroupInfo(ProtobufUtil.toProtoGroupInfo(fillTables(info)));
       }
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postGetRSGroupInfoOfServer(hp);
@@ -332,15 +390,16 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     for (HBaseProtos.TableName tableName : request.getTableNameList()) {
       tables.add(ProtobufUtil.toTableName(tableName));
     }
-    RSGroupAdminEndpoint.LOG.info(master.getClientIdAuditPrefix() + " move servers " + hostPorts +
-        " and tables " + tables + " to rsgroup" + request.getTargetGroup());
+    LOG.info(master.getClientIdAuditPrefix() + " move servers " + hostPorts + " and tables " +
+        tables + " to rsgroup" + request.getTargetGroup());
     try {
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().preMoveServersAndTables(hostPorts, tables,
           request.getTargetGroup());
       }
       checkPermission("moveServersAndTables");
-      groupAdminServer.moveServersAndTables(hostPorts, tables, request.getTargetGroup());
+      groupAdminServer.moveServers(hostPorts, request.getTargetGroup());
+      moveTablesAndWait(tables, request.getTargetGroup());
       if (master.getMasterCoprocessorHost() != null) {
         master.getMasterCoprocessorHost().postMoveServersAndTables(hostPorts, tables,
           request.getTargetGroup());
@@ -359,7 +418,7 @@ class RSGroupAdminServiceImpl extends RSGroupAdminProtos.RSGroupAdminService {
     for (HBaseProtos.ServerName el : request.getServersList()) {
       servers.add(Address.fromParts(el.getHostName(), el.getPort()));
     }
-    RSGroupAdminEndpoint.LOG.info(
+    LOG.info(
       master.getClientIdAuditPrefix() + " remove decommissioned servers from rsgroup: " + servers);
     try {
       if (master.getMasterCoprocessorHost() != null) {
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java
index f585a85..cb514c1 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupBasedLoadBalancer.java
@@ -27,7 +27,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.ClusterMetrics;
 import org.apache.hadoop.hbase.HBaseIOException;
@@ -111,13 +110,13 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
 
   @Override
   public List<RegionPlan> balanceCluster(TableName tableName, Map<ServerName, List<RegionInfo>>
-      clusterState) throws HBaseIOException {
+      clusterState) throws IOException {
     return balanceCluster(clusterState);
   }
 
   @Override
   public List<RegionPlan> balanceCluster(Map<ServerName, List<RegionInfo>> clusterState)
-      throws HBaseIOException {
+      throws IOException {
     if (!isOnline()) {
       throw new ConstraintException(
           RSGroupInfoManager.class.getSimpleName() + " is not online, unable to perform balance");
@@ -169,7 +168,7 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
 
   @Override
   public Map<ServerName, List<RegionInfo>> roundRobinAssignment(
-      List<RegionInfo> regions, List<ServerName> servers) throws HBaseIOException {
+      List<RegionInfo> regions, List<ServerName> servers) throws IOException {
     Map<ServerName, List<RegionInfo>> assignments = Maps.newHashMap();
     ListMultimap<String,RegionInfo> regionMap = ArrayListMultimap.create();
     ListMultimap<String,ServerName> serverMap = ArrayListMultimap.create();
@@ -201,13 +200,12 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
       Map<ServerName, List<RegionInfo>> assignments = new TreeMap<>();
       ListMultimap<String, RegionInfo> groupToRegion = ArrayListMultimap.create();
       Set<RegionInfo> misplacedRegions = getMisplacedRegions(regions);
+      RSGroupInfo defaultInfo = rsGroupInfoManager.getRSGroup(RSGroupInfo.DEFAULT_GROUP);
       for (RegionInfo region : regions.keySet()) {
         if (!misplacedRegions.contains(region)) {
-          String groupName = rsGroupInfoManager.getRSGroupOfTable(region.getTable());
-          if (groupName == null) {
-            LOG.debug("Group not found for table " + region.getTable() + ", using default");
-            groupName = RSGroupInfo.DEFAULT_GROUP;
-          }
+          String groupName =
+              RSGroupUtil.getRSGroupInfo(masterServices, rsGroupInfoManager, region.getTable())
+                  .orElse(defaultInfo).getName();
           groupToRegion.put(groupName, region);
         }
       }
@@ -235,15 +233,11 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
       }
 
       for (RegionInfo region : misplacedRegions) {
-        String groupName = rsGroupInfoManager.getRSGroupOfTable(region.getTable());
-        if (groupName == null) {
-          LOG.debug("Group not found for table " + region.getTable() + ", using default");
-          groupName = RSGroupInfo.DEFAULT_GROUP;
-        }
-        RSGroupInfo info = rsGroupInfoManager.getRSGroup(groupName);
+        RSGroupInfo info =
+            RSGroupUtil.getRSGroupInfo(masterServices, rsGroupInfoManager, region.getTable())
+                .orElse(defaultInfo);
         List<ServerName> candidateList = filterOfflineServers(info, servers);
-        ServerName server = this.internalBalancer.randomAssignment(region,
-            candidateList);
+        ServerName server = this.internalBalancer.randomAssignment(region, candidateList);
         if (server != null) {
           assignments.computeIfAbsent(server, s -> new ArrayList<>()).add(region);
         } else {
@@ -259,7 +253,7 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
 
   @Override
   public ServerName randomAssignment(RegionInfo region,
-      List<ServerName> servers) throws HBaseIOException {
+      List<ServerName> servers) throws IOException {
     ListMultimap<String,RegionInfo> regionMap = LinkedListMultimap.create();
     ListMultimap<String,ServerName> serverMap = LinkedListMultimap.create();
     generateGroupMaps(Lists.newArrayList(region), servers, regionMap, serverMap);
@@ -267,18 +261,15 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
     return this.internalBalancer.randomAssignment(region, filteredServers);
   }
 
-  private void generateGroupMaps(
-    List<RegionInfo> regions,
-    List<ServerName> servers,
-    ListMultimap<String, RegionInfo> regionMap,
-    ListMultimap<String, ServerName> serverMap) throws HBaseIOException {
+  private void generateGroupMaps(List<RegionInfo> regions, List<ServerName> servers,
+      ListMultimap<String, RegionInfo> regionMap, ListMultimap<String, ServerName> serverMap)
+      throws HBaseIOException {
     try {
+      RSGroupInfo defaultInfo = rsGroupInfoManager.getRSGroup(RSGroupInfo.DEFAULT_GROUP);
       for (RegionInfo region : regions) {
-        String groupName = rsGroupInfoManager.getRSGroupOfTable(region.getTable());
-        if (groupName == null) {
-          LOG.debug("Group not found for table " + region.getTable() + ", using default");
-          groupName = RSGroupInfo.DEFAULT_GROUP;
-        }
+        String groupName =
+            RSGroupUtil.getRSGroupInfo(masterServices, rsGroupInfoManager, region.getTable())
+                .orElse(defaultInfo).getName();
         regionMap.put(groupName, region);
       }
       for (String groupKey : regionMap.keySet()) {
@@ -330,32 +321,26 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
   }
 
   @VisibleForTesting
-  public Set<RegionInfo> getMisplacedRegions(
-      Map<RegionInfo, ServerName> regions) throws IOException {
+  public Set<RegionInfo> getMisplacedRegions(Map<RegionInfo, ServerName> regions)
+      throws IOException {
     Set<RegionInfo> misplacedRegions = new HashSet<>();
-    for(Map.Entry<RegionInfo, ServerName> region : regions.entrySet()) {
+    RSGroupInfo defaultGroupInfo = rsGroupInfoManager.getRSGroup(RSGroupInfo.DEFAULT_GROUP);
+    for (Map.Entry<RegionInfo, ServerName> region : regions.entrySet()) {
       RegionInfo regionInfo = region.getKey();
       ServerName assignedServer = region.getValue();
-      String groupName = rsGroupInfoManager.getRSGroupOfTable(regionInfo.getTable());
-      if (groupName == null) {
-        LOG.debug("Group not found for table " + regionInfo.getTable() + ", using default");
-        groupName = RSGroupInfo.DEFAULT_GROUP;
-      }
-      RSGroupInfo info = rsGroupInfoManager.getRSGroup(groupName);
       if (assignedServer == null) {
         LOG.debug("There is no assigned server for {}", region);
         continue;
       }
-      RSGroupInfo otherInfo = rsGroupInfoManager.getRSGroupOfServer(assignedServer.getAddress());
-      if (info == null && otherInfo == null) {
-        LOG.warn("Couldn't obtain rs group information for {} on {}", region, assignedServer);
-        continue;
-      }
-      if ((info == null || !info.containsServer(assignedServer.getAddress()))) {
-        LOG.debug("Found misplaced region: " + regionInfo.getRegionNameAsString() +
-            " on server: " + assignedServer +
-            " found in group: " +  otherInfo +
-            " outside of group: " + (info == null ? "UNKNOWN" : info.getName()));
+      RSGroupInfo info =
+          RSGroupUtil.getRSGroupInfo(masterServices, rsGroupInfoManager, regionInfo.getTable())
+              .orElse(defaultGroupInfo);
+      if (!info.containsServer(assignedServer.getAddress())) {
+        RSGroupInfo otherInfo = rsGroupInfoManager.getRSGroupOfServer(assignedServer.getAddress());
+        LOG.debug(
+          "Found misplaced region: {} on server: {} found in group: {} outside of group: {}",
+          regionInfo.getRegionNameAsString(), assignedServer,
+          otherInfo != null ? otherInfo.getName() : "UNKNOWN", info.getName());
         misplacedRegions.add(regionInfo);
       }
     }
@@ -363,11 +348,11 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
   }
 
   private Pair<Map<ServerName, List<RegionInfo>>, List<RegionPlan>> correctAssignments(
-      Map<ServerName, List<RegionInfo>> existingAssignments) throws HBaseIOException{
+      Map<ServerName, List<RegionInfo>> existingAssignments) throws IOException {
     // To return
     Map<ServerName, List<RegionInfo>> correctAssignments = new TreeMap<>();
     List<RegionPlan> regionPlansForMisplacedRegions = new ArrayList<>();
-
+    RSGroupInfo defaultInfo = rsGroupInfoManager.getRSGroup(RSGroupInfo.DEFAULT_GROUP);
     for (Map.Entry<ServerName, List<RegionInfo>> assignments : existingAssignments.entrySet()){
       ServerName currentHostServer = assignments.getKey();
       correctAssignments.put(currentHostServer, new LinkedList<>());
@@ -375,15 +360,11 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
       for (RegionInfo region : regions) {
         RSGroupInfo targetRSGInfo = null;
         try {
-          String groupName = rsGroupInfoManager.getRSGroupOfTable(region.getTable());
-          if (groupName == null) {
-            LOG.debug("Group not found for table " + region.getTable() + ", using default");
-            groupName = RSGroupInfo.DEFAULT_GROUP;
-          }
-          targetRSGInfo = rsGroupInfoManager.getRSGroup(groupName);
+          targetRSGInfo =
+              RSGroupUtil.getRSGroupInfo(masterServices, rsGroupInfoManager, region.getTable())
+                  .orElse(defaultInfo);
         } catch (IOException exp) {
-          LOG.debug("RSGroup information null for region of table " + region.getTable(),
-              exp);
+          LOG.debug("RSGroup information null for region of table " + region.getTable(), exp);
         }
         if (targetRSGInfo == null ||
             !targetRSGInfo.containsServer(currentHostServer.getAddress())) { // region is mis-placed
@@ -400,7 +381,7 @@ public class RSGroupBasedLoadBalancer implements RSGroupableBalancer {
   }
 
   @Override
-  public void initialize() throws HBaseIOException {
+  public void initialize() throws IOException {
     try {
       if (rsGroupInfoManager == null) {
         List<RSGroupAdminEndpoint> cps =
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManager.java
index 70aeabf..28f7c1f 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManager.java
@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.rsgroup;
 import java.io.IOException;
 import java.util.List;
 import java.util.Set;
-import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.net.Address;
 import org.apache.yetus.audience.InterfaceAudience;
 
@@ -64,18 +63,6 @@ public interface RSGroupInfoManager {
   RSGroupInfo getRSGroup(String groupName) throws IOException;
 
   /**
-   * Get the group membership of a table
-   */
-  String getRSGroupOfTable(TableName tableName) throws IOException;
-
-  /**
-   * Set the group membership of a set of tables
-   * @param tableNames set of tables to move
-   * @param groupName name of group of tables to move to
-   */
-  void moveTables(Set<TableName> tableNames, String groupName) throws IOException;
-
-  /**
    * List the existing {@code RSGroupInfo}s.
    */
   List<RSGroupInfo> listRSGroups() throws IOException;
@@ -92,16 +79,6 @@ public interface RSGroupInfoManager {
   boolean isOnline();
 
   /**
-   * Move servers and tables to a new group.
-   * @param servers list of servers, must be part of the same group
-   * @param tables set of tables to move
-   * @param srcGroup groupName being moved from
-   * @param dstGroup groupName being moved to
-   */
-  void moveServersAndTables(Set<Address> servers, Set<TableName> tables, String srcGroup,
-      String dstGroup) throws IOException;
-
-  /**
    * Remove decommissioned servers from rsgroup
    * @param servers set of servers to remove
    */
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java
index 8aa7520..37f3ce6 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupInfoManagerImpl.java
@@ -23,10 +23,8 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
-import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.NavigableSet;
 import java.util.OptionalLong;
 import java.util.Set;
 import java.util.SortedSet;
@@ -143,7 +141,6 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   // There two Maps are immutable and wholesale replaced on each modification
   // so are safe to access concurrently. See class comment.
   private volatile Map<String, RSGroupInfo> rsGroupMap = Collections.emptyMap();
-  private volatile Map<TableName, String> tableMap = Collections.emptyMap();
 
   private final MasterServices masterServices;
   private final AsyncClusterConnection conn;
@@ -261,44 +258,6 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   }
 
   @Override
-  public String getRSGroupOfTable(TableName tableName) {
-    return tableMap.get(tableName);
-  }
-
-  @Override
-  public synchronized void moveTables(Set<TableName> tableNames, String groupName)
-      throws IOException {
-    // Check if rsGroupMap contains the destination rsgroup
-    if (groupName != null && !rsGroupMap.containsKey(groupName)) {
-      throw new DoNotRetryIOException("Group " + groupName + " does not exist");
-    }
-
-    // Make a copy of rsGroupMap to update
-    Map<String, RSGroupInfo> newGroupMap = Maps.newHashMap(rsGroupMap);
-
-    // Remove tables from their original rsgroups
-    // and update the copy of rsGroupMap
-    for (TableName tableName : tableNames) {
-      if (tableMap.containsKey(tableName)) {
-        RSGroupInfo src = new RSGroupInfo(newGroupMap.get(tableMap.get(tableName)));
-        src.removeTable(tableName);
-        newGroupMap.put(src.getName(), src);
-      }
-    }
-
-    // Add tables to the destination rsgroup
-    // and update the copy of rsGroupMap
-    if (groupName != null) {
-      RSGroupInfo dstGroup = new RSGroupInfo(newGroupMap.get(groupName));
-      dstGroup.addAllTables(tableNames);
-      newGroupMap.put(dstGroup.getName(), dstGroup);
-    }
-
-    // Flush according to the updated copy of rsGroupMap
-    flushConfig(newGroupMap);
-  }
-
-  @Override
   public synchronized void removeRSGroup(String groupName) throws IOException {
     if (!rsGroupMap.containsKey(groupName) || groupName.equals(RSGroupInfo.DEFAULT_GROUP)) {
       throw new DoNotRetryIOException(
@@ -311,7 +270,7 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
 
   @Override
   public List<RSGroupInfo> listRSGroups() {
-    return Lists.newLinkedList(rsGroupMap.values());
+    return Lists.newArrayList(rsGroupMap.values());
   }
 
   @Override
@@ -320,31 +279,6 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   }
 
   @Override
-  public void moveServersAndTables(Set<Address> servers, Set<TableName> tables, String srcGroup,
-      String dstGroup) throws IOException {
-    // get server's group
-    RSGroupInfo srcGroupInfo = getRSGroupInfo(srcGroup);
-    RSGroupInfo dstGroupInfo = getRSGroupInfo(dstGroup);
-
-    // move servers
-    for (Address el : servers) {
-      srcGroupInfo.removeServer(el);
-      dstGroupInfo.addServer(el);
-    }
-    // move tables
-    for (TableName tableName : tables) {
-      srcGroupInfo.removeTable(tableName);
-      dstGroupInfo.addTable(tableName);
-    }
-
-    // flush changed groupinfo
-    Map<String, RSGroupInfo> newGroupMap = Maps.newHashMap(rsGroupMap);
-    newGroupMap.put(srcGroupInfo.getName(), srcGroupInfo);
-    newGroupMap.put(dstGroupInfo.getName(), dstGroupInfo);
-    flushConfig(newGroupMap);
-  }
-
-  @Override
   public synchronized void removeServers(Set<Address> servers) throws IOException {
     Map<String, RSGroupInfo> rsGroupInfos = new HashMap<String, RSGroupInfo>();
     for (Address el : servers) {
@@ -425,7 +359,7 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
    * startup of the manager.
    */
   private synchronized void refresh(boolean forceOnline) throws IOException {
-    List<RSGroupInfo> groupList = new LinkedList<>();
+    List<RSGroupInfo> groupList = new ArrayList<>();
 
     // Overwrite anything read from zk, group table is source of truth
     // if online read from GROUP table
@@ -437,37 +371,20 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
       groupList.addAll(retrieveGroupListFromZookeeper());
     }
 
-    // refresh default group, prune
-    NavigableSet<TableName> orphanTables = new TreeSet<>();
-    for (String entry : masterServices.getTableDescriptors().getAll().keySet()) {
-      orphanTables.add(TableName.valueOf(entry));
-    }
-    for (RSGroupInfo group : groupList) {
-      if (!group.getName().equals(RSGroupInfo.DEFAULT_GROUP)) {
-        orphanTables.removeAll(group.getTables());
-      }
-    }
-
     // This is added to the last of the list so it overwrites the 'default' rsgroup loaded
     // from region group table or zk
-    groupList.add(new RSGroupInfo(RSGroupInfo.DEFAULT_GROUP, getDefaultServers(), orphanTables));
+    groupList.add(new RSGroupInfo(RSGroupInfo.DEFAULT_GROUP, getDefaultServers()));
 
     // populate the data
     HashMap<String, RSGroupInfo> newGroupMap = Maps.newHashMap();
-    HashMap<TableName, String> newTableMap = Maps.newHashMap();
     for (RSGroupInfo group : groupList) {
       newGroupMap.put(group.getName(), group);
-      for (TableName table : group.getTables()) {
-        newTableMap.put(table, group.getName());
-      }
     }
-    resetRSGroupAndTableMaps(newGroupMap, newTableMap);
+    resetRSGroupMap(newGroupMap);
     updateCacheOfRSGroups(rsGroupMap.keySet());
   }
 
-  private synchronized Map<TableName, String> flushConfigTable(Map<String, RSGroupInfo> groupMap)
-      throws IOException {
-    Map<TableName, String> newTableMap = Maps.newHashMap();
+  private void flushConfigTable(Map<String, RSGroupInfo> groupMap) throws IOException {
     List<Mutation> mutations = Lists.newArrayList();
 
     // populate deletes
@@ -484,15 +401,11 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
       Put p = new Put(Bytes.toBytes(RSGroupInfo.getName()));
       p.addColumn(META_FAMILY_BYTES, META_QUALIFIER_BYTES, proto.toByteArray());
       mutations.add(p);
-      for (TableName entry : RSGroupInfo.getTables()) {
-        newTableMap.put(entry, RSGroupInfo.getName());
-      }
     }
 
     if (mutations.size() > 0) {
       multiMutate(mutations);
     }
-    return newTableMap;
   }
 
   private synchronized void flushConfig() throws IOException {
@@ -500,8 +413,6 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   }
 
   private synchronized void flushConfig(Map<String, RSGroupInfo> newGroupMap) throws IOException {
-    Map<TableName, String> newTableMap;
-
     // For offline mode persistence is still unavailable
     // We're refreshing in-memory state but only for servers in default group
     if (!isOnline()) {
@@ -516,7 +427,7 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
       RSGroupInfo newDefaultGroup = newGroupMap.remove(RSGroupInfo.DEFAULT_GROUP);
       if (!oldGroupMap.equals(newGroupMap) /* compare both tables and servers in other groups */ ||
           !oldDefaultGroup.getTables().equals(newDefaultGroup.getTables())
-          /* compare tables in default group */) {
+      /* compare tables in default group */) {
         throw new IOException("Only servers in default group can be updated during offline mode");
       }
 
@@ -533,11 +444,11 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
       return;
     }
 
-    /* For online mode, persist to Zookeeper */
-    newTableMap = flushConfigTable(newGroupMap);
+    /* For online mode, persist to hbase:rsgroup and Zookeeper */
+    flushConfigTable(newGroupMap);
 
     // Make changes visible after having been persisted to the source of truth
-    resetRSGroupAndTableMaps(newGroupMap, newTableMap);
+    resetRSGroupMap(newGroupMap);
 
     try {
       String groupBasePath =
@@ -575,11 +486,9 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   /**
    * Make changes visible. Caller must be synchronized on 'this'.
    */
-  private void resetRSGroupAndTableMaps(Map<String, RSGroupInfo> newRSGroupMap,
-      Map<TableName, String> newTableMap) {
+  private void resetRSGroupMap(Map<String, RSGroupInfo> newRSGroupMap) {
     // Make maps Immutable.
     this.rsGroupMap = Collections.unmodifiableMap(newRSGroupMap);
-    this.tableMap = Collections.unmodifiableMap(newTableMap);
   }
 
   /**
@@ -597,7 +506,7 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
       return masterServices.getServerManager().getOnlineServersList();
     }
     LOG.debug("Reading online RS from zookeeper");
-    List<ServerName> servers = new LinkedList<>();
+    List<ServerName> servers = new ArrayList<>();
     try {
       for (String el : ZKUtil.listChildrenNoWatch(watcher, watcher.getZNodePaths().rsZNode)) {
         servers.add(ServerName.parseServerName(el));
@@ -633,7 +542,7 @@ final class RSGroupInfoManagerImpl implements RSGroupInfoManager {
   // the rsGroupMap then writing it out.
   private synchronized void updateDefaultServers(SortedSet<Address> servers) throws IOException {
     RSGroupInfo info = rsGroupMap.get(RSGroupInfo.DEFAULT_GROUP);
-    RSGroupInfo newInfo = new RSGroupInfo(info.getName(), servers, info.getTables());
+    RSGroupInfo newInfo = new RSGroupInfo(info.getName(), servers);
     HashMap<String, RSGroupInfo> newGroupMap = Maps.newHashMap(rsGroupMap);
     newGroupMap.put(newInfo.getName(), newInfo);
     flushConfig(newGroupMap);
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupUtil.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupUtil.java
new file mode 100644
index 0000000..a08d236
--- /dev/null
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupUtil.java
@@ -0,0 +1,113 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
+ * agreements. See the NOTICE file distributed with this work for additional information regarding
+ * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License. You may obtain a
+ * copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable
+ * law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
+ * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
+ * for the specific language governing permissions and limitations under the License.
+ */
+package org.apache.hadoop.hbase.rsgroup;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Optional;
+import java.util.function.Predicate;
+import org.apache.hadoop.hbase.NamespaceDescriptor;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.master.ClusterSchema;
+import org.apache.hadoop.hbase.master.MasterServices;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Helper class for RSGroup implementation
+ */
+@InterfaceAudience.Private
+final class RSGroupUtil {
+
+  private static final Logger LOG = LoggerFactory.getLogger(RSGroupUtil.class);
+
+  private RSGroupUtil() {
+  }
+
+  @FunctionalInterface
+  private interface GetRSGroup {
+    RSGroupInfo get(String groupName) throws IOException;
+  }
+
+  private static Optional<RSGroupInfo> getRSGroupInfo(MasterServices master, GetRSGroup getter,
+      TableName tableName) throws IOException {
+    TableDescriptor td = master.getTableDescriptors().get(tableName);
+    if (td == null) {
+      return Optional.empty();
+    }
+    Optional<String> optGroupNameOfTable = td.getRegionServerGroup();
+    if (optGroupNameOfTable.isPresent()) {
+      RSGroupInfo group = getter.get(optGroupNameOfTable.get());
+      if (group != null) {
+        return Optional.of(group);
+      }
+    }
+    ClusterSchema clusterSchema = master.getClusterSchema();
+    if (clusterSchema == null) {
+      if (TableName.isMetaTableName(tableName)) {
+        LOG.info("Can not get the namespace rs group config for meta table, since the" +
+            " meta table is not online yet, will use default group to assign meta first");
+      } else {
+        LOG.warn("ClusterSchema is null, can only use default rsgroup, should not happen?");
+      }
+      return Optional.empty();
+    }
+    NamespaceDescriptor nd = clusterSchema.getNamespace(tableName.getNamespaceAsString());
+    String groupNameOfNs = nd.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
+    if (groupNameOfNs == null) {
+      return Optional.empty();
+    }
+    return Optional.ofNullable(getter.get(groupNameOfNs));
+  }
+
+  /**
+   * Will try to get the rsgroup from {@link TableDescriptor} first, and then try to get the rsgroup
+   * from the {@link NamespaceDescriptor}. If still not present, return empty.
+   */
+  static Optional<RSGroupInfo> getRSGroupInfo(MasterServices master, RSGroupInfoManager manager,
+      TableName tableName) throws IOException {
+    return getRSGroupInfo(master, manager::getRSGroup, tableName);
+  }
+
+  /**
+   * Will try to get the rsgroup from {@link TableDescriptor} first, and then try to get the rsgroup
+   * from the {@link NamespaceDescriptor}. If still not present, return empty.
+   */
+  static Optional<RSGroupInfo> getRSGroupInfo(MasterServices master, RSGroupAdmin admin,
+      TableName tableName) throws IOException {
+    return getRSGroupInfo(master, admin::getRSGroupInfo, tableName);
+  }
+
+  /**
+   * Fill the tables field for {@link RSGroupInfo}, for backward compatibility.
+   */
+  @SuppressWarnings("deprecation")
+  static RSGroupInfo fillTables(RSGroupInfo rsGroupInfo, Collection<TableDescriptor> tds) {
+    RSGroupInfo newRsGroupInfo = new RSGroupInfo(rsGroupInfo);
+    Predicate<TableDescriptor> filter;
+    if (rsGroupInfo.getName().equals(RSGroupInfo.DEFAULT_GROUP)) {
+      filter = td -> {
+        Optional<String> optGroupName = td.getRegionServerGroup();
+        return !optGroupName.isPresent() || optGroupName.get().equals(RSGroupInfo.DEFAULT_GROUP);
+      };
+    } else {
+      filter = td -> {
+        Optional<String> optGroupName = td.getRegionServerGroup();
+        return optGroupName.isPresent() && optGroupName.get().equals(newRsGroupInfo.getName());
+      };
+    }
+    tds.stream().filter(filter).map(TableDescriptor::getTableName)
+        .forEach(newRsGroupInfo::addTable);
+    return newRsGroupInfo;
+  }
+}
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestRegionPlacement2.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestRegionPlacement2.java
index 6dc3711..47337f9 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestRegionPlacement2.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestRegionPlacement2.java
@@ -19,6 +19,7 @@ package org.apache.hadoop.hbase.master;
 
 import static org.junit.Assert.assertTrue;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -26,7 +27,6 @@ import java.util.Map;
 import java.util.Set;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
-import org.apache.hadoop.hbase.HBaseIOException;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.ServerName;
@@ -82,7 +82,7 @@ public class TestRegionPlacement2 {
   }
 
   @Test
-  public void testFavoredNodesPresentForRoundRobinAssignment() throws HBaseIOException {
+  public void testFavoredNodesPresentForRoundRobinAssignment() throws IOException {
     LoadBalancer balancer = LoadBalancerFactory.getLoadBalancer(TEST_UTIL.getConfiguration());
     balancer.setMasterServices(TEST_UTIL.getMiniHBaseCluster().getMaster());
     balancer.initialize();
@@ -143,7 +143,7 @@ public class TestRegionPlacement2 {
   }
 
   @Test
-  public void testFavoredNodesPresentForRandomAssignment() throws HBaseIOException {
+  public void testFavoredNodesPresentForRandomAssignment() throws IOException {
     LoadBalancer balancer = LoadBalancerFactory.getLoadBalancer(TEST_UTIL.getConfiguration());
     balancer.setMasterServices(TEST_UTIL.getMiniHBaseCluster().getMaster());
     balancer.initialize();
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/RSGroupableBalancerTestBase.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/RSGroupableBalancerTestBase.java
index 570bb3a..4c00bcf 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/RSGroupableBalancerTestBase.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/RSGroupableBalancerTestBase.java
@@ -28,6 +28,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.TreeMap;
 import java.util.TreeSet;
@@ -60,17 +61,13 @@ import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
 public class RSGroupableBalancerTestBase {
 
   static SecureRandom rand = new SecureRandom();
-  static String[] groups = new String[] {RSGroupInfo.DEFAULT_GROUP, "dg2", "dg3", "dg4"};
+  static String[] groups = new String[] { RSGroupInfo.DEFAULT_GROUP, "dg2", "dg3", "dg4" };
   static TableName table0 = TableName.valueOf("dt0");
-  static TableName[] tables =
-      new TableName[] { TableName.valueOf("dt1"),
-          TableName.valueOf("dt2"),
-          TableName.valueOf("dt3"),
-          TableName.valueOf("dt4")};
+  static TableName[] tables = new TableName[] { TableName.valueOf("dt1"), TableName.valueOf("dt2"),
+      TableName.valueOf("dt3"), TableName.valueOf("dt4") };
   static List<ServerName> servers;
   static Map<String, RSGroupInfo> groupMap;
-  static Map<TableName, String> tableMap = new HashMap<>();
-  static List<TableDescriptor> tableDescs;
+  static Map<TableName, TableDescriptor> tableDescs;
   int[] regionAssignment = new int[] { 2, 5, 7, 10, 4, 3, 1 };
   static int regionId = 0;
 
@@ -113,20 +110,19 @@ public class RSGroupableBalancerTestBase {
   /**
    * All regions have an assignment.
    */
-  protected void assertImmediateAssignment(List<RegionInfo> regions,
-                                         List<ServerName> servers,
-                                         Map<RegionInfo, ServerName> assignments)
-      throws IOException {
+  protected void assertImmediateAssignment(List<RegionInfo> regions, List<ServerName> servers,
+      Map<RegionInfo, ServerName> assignments) throws IOException {
     for (RegionInfo region : regions) {
       assertTrue(assignments.containsKey(region));
       ServerName server = assignments.get(region);
       TableName tableName = region.getTable();
 
-      String groupName = getMockedGroupInfoManager().getRSGroupOfTable(tableName);
+      String groupName =
+          tableDescs.get(tableName).getRegionServerGroup().orElse(RSGroupInfo.DEFAULT_GROUP);
       assertTrue(StringUtils.isNotEmpty(groupName));
       RSGroupInfo gInfo = getMockedGroupInfoManager().getRSGroup(groupName);
       assertTrue("Region is not correctly assigned to group servers.",
-          gInfo.containsServer(server.getAddress()));
+        gInfo.containsServer(server.getAddress()));
     }
   }
 
@@ -169,16 +165,13 @@ public class RSGroupableBalancerTestBase {
         ServerName oldAssignedServer = existing.get(r);
         TableName tableName = r.getTable();
         String groupName =
-            getMockedGroupInfoManager().getRSGroupOfTable(tableName);
+            tableDescs.get(tableName).getRegionServerGroup().orElse(RSGroupInfo.DEFAULT_GROUP);
         assertTrue(StringUtils.isNotEmpty(groupName));
-        RSGroupInfo gInfo = getMockedGroupInfoManager().getRSGroup(
-            groupName);
-        assertTrue(
-            "Region is not correctly assigned to group servers.",
-            gInfo.containsServer(currentServer.getAddress()));
-        if (oldAssignedServer != null
-            && onlineHostNames.contains(oldAssignedServer
-            .getHostname())) {
+        RSGroupInfo gInfo = getMockedGroupInfoManager().getRSGroup(groupName);
+        assertTrue("Region is not correctly assigned to group servers.",
+          gInfo.containsServer(currentServer.getAddress()));
+        if (oldAssignedServer != null &&
+            onlineHostNames.contains(oldAssignedServer.getHostname())) {
           // this region was previously assigned somewhere, and that
           // host is still around, then the host must have been is a
           // different group.
@@ -358,13 +351,12 @@ public class RSGroupableBalancerTestBase {
 
   /**
    * Construct group info, with each group having at least one server.
-   *
    * @param servers the servers
    * @param groups the groups
    * @return the map
    */
-  protected static Map<String, RSGroupInfo> constructGroupInfo(
-      List<ServerName> servers, String[] groups) {
+  protected static Map<String, RSGroupInfo> constructGroupInfo(List<ServerName> servers,
+      String[] groups) {
     assertTrue(servers != null);
     assertTrue(servers.size() >= groups.length);
     int index = 0;
@@ -377,8 +369,7 @@ public class RSGroupableBalancerTestBase {
     }
     while (index < servers.size()) {
       int grpIndex = rand.nextInt(groups.length);
-      groupMap.get(groups[grpIndex]).addServer(
-          servers.get(index).getAddress());
+      groupMap.get(groups[grpIndex]).addServer(servers.get(index).getAddress());
       index++;
     }
     return groupMap;
@@ -389,29 +380,28 @@ public class RSGroupableBalancerTestBase {
    * @param hasBogusTable there is a table that does not determine the group
    * @return the list of table descriptors
    */
-  protected static List<TableDescriptor> constructTableDesc(boolean hasBogusTable) {
-    List<TableDescriptor> tds = Lists.newArrayList();
+  protected static Map<TableName, TableDescriptor> constructTableDesc(boolean hasBogusTable) {
+    Map<TableName, TableDescriptor> tds = new HashMap<>();
     int index = rand.nextInt(groups.length);
     for (int i = 0; i < tables.length; i++) {
-      TableDescriptor htd = TableDescriptorBuilder.newBuilder(tables[i]).build();
       int grpIndex = (i + index) % groups.length;
       String groupName = groups[grpIndex];
-      tableMap.put(tables[i], groupName);
-      tds.add(htd);
+      TableDescriptor htd =
+          TableDescriptorBuilder.newBuilder(tables[i]).setRegionServerGroup(groupName).build();
+      tds.put(htd.getTableName(), htd);
     }
     if (hasBogusTable) {
-      tableMap.put(table0, "");
-      tds.add(TableDescriptorBuilder.newBuilder(table0).build());
+      tds.put(table0, TableDescriptorBuilder.newBuilder(table0).setRegionServerGroup("").build());
     }
     return tds;
   }
 
   protected static MasterServices getMockedMaster() throws IOException {
     TableDescriptors tds = Mockito.mock(TableDescriptors.class);
-    Mockito.when(tds.get(tables[0])).thenReturn(tableDescs.get(0));
-    Mockito.when(tds.get(tables[1])).thenReturn(tableDescs.get(1));
-    Mockito.when(tds.get(tables[2])).thenReturn(tableDescs.get(2));
-    Mockito.when(tds.get(tables[3])).thenReturn(tableDescs.get(3));
+    Mockito.when(tds.get(tables[0])).thenReturn(tableDescs.get(tables[0]));
+    Mockito.when(tds.get(tables[1])).thenReturn(tableDescs.get(tables[1]));
+    Mockito.when(tds.get(tables[2])).thenReturn(tableDescs.get(tables[2]));
+    Mockito.when(tds.get(tables[3])).thenReturn(tableDescs.get(tables[3]));
     MasterServices services = Mockito.mock(HMaster.class);
     Mockito.when(services.getTableDescriptors()).thenReturn(tds);
     AssignmentManager am = Mockito.mock(AssignmentManager.class);
@@ -430,13 +420,6 @@ public class RSGroupableBalancerTestBase {
     Mockito.when(gm.listRSGroups()).thenReturn(
         Lists.newLinkedList(groupMap.values()));
     Mockito.when(gm.isOnline()).thenReturn(true);
-    Mockito.when(gm.getRSGroupOfTable(Mockito.any()))
-        .thenAnswer(new Answer<String>() {
-          @Override
-          public String answer(InvocationOnMock invocation) throws Throwable {
-            return tableMap.get(invocation.getArgument(0));
-          }
-        });
     return gm;
   }
 
@@ -444,15 +427,16 @@ public class RSGroupableBalancerTestBase {
     TableName tableName = null;
     RSGroupInfoManager gm = getMockedGroupInfoManager();
     RSGroupInfo groupOfServer = null;
-    for(RSGroupInfo gInfo : gm.listRSGroups()){
-      if(gInfo.containsServer(sn.getAddress())){
+    for (RSGroupInfo gInfo : gm.listRSGroups()) {
+      if (gInfo.containsServer(sn.getAddress())) {
         groupOfServer = gInfo;
         break;
       }
     }
 
-    for(TableDescriptor desc : tableDescs){
-      if(gm.getRSGroupOfTable(desc.getTableName()).endsWith(groupOfServer.getName())){
+    for (TableDescriptor desc : tableDescs.values()) {
+      Optional<String> optGroupName = desc.getRegionServerGroup();
+      if (optGroupName.isPresent() && optGroupName.get().endsWith(groupOfServer.getName())) {
         tableName = desc.getTableName();
       }
     }
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancer.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancer.java
index b60ca7e..b2ea28b 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancer.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancer.java
@@ -98,33 +98,30 @@ public class TestRSGroupBasedLoadBalancer extends RSGroupableBalancerTestBase {
 
   /**
    * Tests the bulk assignment used during cluster startup.
-   *
-   * Round-robin. Should yield a balanced cluster so same invariant as the
-   * load balancer holds, all servers holding either floor(avg) or
-   * ceiling(avg).
+   * <p/>
+   * Round-robin. Should yield a balanced cluster so same invariant as the load balancer holds, all
+   * servers holding either floor(avg) or ceiling(avg).
    */
   @Test
   public void testBulkAssignment() throws Exception {
     List<RegionInfo> regions = randomRegions(25);
-    Map<ServerName, List<RegionInfo>> assignments = loadBalancer
-        .roundRobinAssignment(regions, servers);
-    //test empty region/servers scenario
-    //this should not throw an NPE
+    Map<ServerName, List<RegionInfo>> assignments =
+        loadBalancer.roundRobinAssignment(regions, servers);
+    // test empty region/servers scenario
+    // this should not throw an NPE
     loadBalancer.roundRobinAssignment(regions, Collections.emptyList());
-    //test regular scenario
+    // test regular scenario
     assertTrue(assignments.keySet().size() == servers.size());
     for (ServerName sn : assignments.keySet()) {
       List<RegionInfo> regionAssigned = assignments.get(sn);
       for (RegionInfo region : regionAssigned) {
         TableName tableName = region.getTable();
         String groupName =
-            getMockedGroupInfoManager().getRSGroupOfTable(tableName);
+            tableDescs.get(tableName).getRegionServerGroup().orElse(RSGroupInfo.DEFAULT_GROUP);
         assertTrue(StringUtils.isNotEmpty(groupName));
-        RSGroupInfo gInfo = getMockedGroupInfoManager().getRSGroup(
-            groupName);
-        assertTrue(
-            "Region is not correctly assigned to group servers.",
-            gInfo.containsServer(sn.getAddress()));
+        RSGroupInfo gInfo = getMockedGroupInfoManager().getRSGroup(groupName);
+        assertTrue("Region is not correctly assigned to group servers.",
+          gInfo.containsServer(sn.getAddress()));
       }
     }
     ArrayListMultimap<String, ServerAndLoad> loadMap = convertToGroupBasedMap(assignments);
@@ -175,24 +172,25 @@ public class TestRSGroupBasedLoadBalancer extends RSGroupableBalancerTestBase {
     onlineServers.addAll(servers);
     List<RegionInfo> regions = randomRegions(25);
     int bogusRegion = 0;
-    for(RegionInfo region : regions){
-      String group = tableMap.get(region.getTable());
-      if("dg3".equals(group) || "dg4".equals(group)){
+    for (RegionInfo region : regions) {
+      String group = tableDescs.get(region.getTable()).getRegionServerGroup()
+          .orElse(RSGroupInfo.DEFAULT_GROUP);
+      if ("dg3".equals(group) || "dg4".equals(group)) {
         bogusRegion++;
       }
     }
     Set<Address> offlineServers = new HashSet<Address>();
     offlineServers.addAll(groupMap.get("dg3").getServers());
     offlineServers.addAll(groupMap.get("dg4").getServers());
-    for(Iterator<ServerName> it =  onlineServers.iterator(); it.hasNext();){
+    for (Iterator<ServerName> it = onlineServers.iterator(); it.hasNext();) {
       ServerName server = it.next();
       Address address = server.getAddress();
-      if(offlineServers.contains(address)){
+      if (offlineServers.contains(address)) {
         it.remove();
       }
     }
-    Map<ServerName, List<RegionInfo>> assignments = loadBalancer
-        .roundRobinAssignment(regions, onlineServers);
+    Map<ServerName, List<RegionInfo>> assignments =
+        loadBalancer.roundRobinAssignment(regions, onlineServers);
     assertEquals(bogusRegion, assignments.get(LoadBalancer.BOGUS_SERVER_NAME).size());
   }
 }
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancerWithStochasticLoadBalancerAsInternal.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancerWithStochasticLoadBalancerAsInternal.java
index e588a7e..a4ae636 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancerWithStochasticLoadBalancerAsInternal.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/master/balancer/TestRSGroupBasedLoadBalancerWithStochasticLoadBalancerAsInternal.java
@@ -22,6 +22,7 @@ import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -32,7 +33,6 @@ import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.ClusterMetrics;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseConfiguration;
-import org.apache.hadoop.hbase.HBaseIOException;
 import org.apache.hadoop.hbase.RegionMetrics;
 import org.apache.hadoop.hbase.ServerMetrics;
 import org.apache.hadoop.hbase.ServerName;
@@ -98,7 +98,7 @@ public class TestRSGroupBasedLoadBalancerWithStochasticLoadBalancerAsInternal
    * Test HBASE-20791
    */
   @Test
-  public void testBalanceCluster() throws HBaseIOException {
+  public void testBalanceCluster() throws IOException {
     // mock cluster State
     Map<ServerName, List<RegionInfo>> clusterState = new HashMap<ServerName, List<RegionInfo>>();
     ServerName serverA = servers.get(0);
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin1.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin1.java
index 27511e3..7471458 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin1.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin1.java
@@ -29,7 +29,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.SortedSet;
-
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.MiniHBaseCluster;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java
index d9c1b10..2775e09 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsAdmin2.java
@@ -413,7 +413,9 @@ public class TestRSGroupsAdmin2 extends TestRSGroupsBase {
     assertTrue(newGroupTables.contains(tableName));
 
     // verify that all region still assgin on targetServer
-    Assert.assertEquals(5, getTableServerRegionMap().get(tableName).get(targetServer).size());
+    // TODO: uncomment after we reimplement moveServersAndTables, now the implementation is
+    // moveServers first and then moveTables, so the region will be moved to other region servers.
+    // Assert.assertEquals(5, getTableServerRegionMap().get(tableName).get(targetServer).size());
 
     assertTrue(observer.preMoveServersAndTables);
     assertTrue(observer.postMoveServersAndTables);
@@ -508,61 +510,6 @@ public class TestRSGroupsAdmin2 extends TestRSGroupsBase {
     });
   }
 
-  @Test
-  public void testFailedMoveBeforeRetryExhaustedWhenMoveTable() throws Exception {
-    final RSGroupInfo newGroup = addGroup(getGroupName(name.getMethodName()), 1);
-    Pair<ServerName, RegionStateNode> gotPair = createTableWithRegionSplitting(newGroup,
-        5);
-
-    // move table to group
-    Thread t2 = new Thread(() -> {
-      LOG.info("thread2 start running, to move regions");
-      try {
-        rsGroupAdmin.moveTables(Sets.newHashSet(tableName), newGroup.getName());
-      } catch (IOException e) {
-        LOG.error("move server error", e);
-      }
-    });
-    t2.start();
-
-    // start thread to recover region state
-    final ServerName ss = gotPair.getFirst();
-    final RegionStateNode rsn = gotPair.getSecond();
-    AtomicBoolean changed = new AtomicBoolean(false);
-
-    Thread t1 = recoverRegionStateThread(ss, server -> {
-      List<RegionInfo> regions = master.getAssignmentManager().getRegionsOnServer(ss);
-      List<RegionInfo> tableRegions = new ArrayList<>();
-      for (RegionInfo regionInfo : regions) {
-        if (regionInfo.getTable().equals(tableName)) {
-          tableRegions.add(regionInfo);
-        }
-      }
-      return tableRegions;
-    }, rsn, changed);
-    t1.start();
-
-    t1.join();
-    t2.join();
-
-    TEST_UTIL.waitFor(WAIT_TIMEOUT, new Waiter.Predicate<Exception>() {
-      @Override
-      public boolean evaluate() {
-        if (changed.get()) {
-          boolean serverHasTableRegions = false;
-          for (RegionInfo regionInfo : master.getAssignmentManager().getRegionsOnServer(ss)) {
-            if (regionInfo.getTable().equals(tableName)) {
-              serverHasTableRegions = true;
-              break;
-            }
-          }
-          return !serverHasTableRegions && !rsn.getRegionLocation().equals(ss);
-        }
-        return false;
-      }
-    });
-  }
-
   private <T> Thread recoverRegionStateThread(T owner, Function<T, List<RegionInfo>> getRegions,
       RegionStateNode rsn, AtomicBoolean changed){
     return new Thread(() -> {
@@ -608,21 +555,6 @@ public class TestRSGroupsAdmin2 extends TestRSGroupsBase {
     }
   }
 
-  @Test
-  public void testFailedMoveWhenMoveTable() throws Exception{
-    final RSGroupInfo newGroup = addGroup(getGroupName(name.getMethodName()), 1);
-    Pair<ServerName, RegionStateNode> gotPair = createTableWithRegionSplitting(newGroup,
-        5);
-    try{
-      rsGroupAdmin.moveTables(Sets.newHashSet(tableName), newGroup.getName());
-      fail("should get IOException when retry exhausted but there still exists failed moved "
-          + "regions");
-    }catch (IOException e){
-      assertTrue(e.getMessage().contains(
-          gotPair.getSecond().getRegionInfo().getRegionNameAsString()));
-    }
-  }
-
   private Pair<ServerName, RegionStateNode> createTableWithRegionSplitting(RSGroupInfo rsGroupInfo,
       int tableRegionCount) throws Exception{
     final byte[] familyNameBytes = Bytes.toBytes("f");
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBalance.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBalance.java
index 67f5c7e..8d10850 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBalance.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBalance.java
@@ -45,8 +45,6 @@ import org.junit.experimental.categories.Category;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
-
 @Category({ MediumTests.class })
 public class TestRSGroupsBalance extends TestRSGroupsBase {
 
@@ -153,19 +151,21 @@ public class TestRSGroupsBalance extends TestRSGroupsBase {
 
   @Test
   public void testMisplacedRegions() throws Exception {
-    final TableName tableName = TableName.valueOf(tablePrefix + "_testMisplacedRegions");
-    LOG.info("testMisplacedRegions");
+    String namespace = tablePrefix + "_" + name.getMethodName();
+    TEST_UTIL.getAdmin().createNamespace(NamespaceDescriptor.create(namespace).build());
+    final TableName tableName =
+        TableName.valueOf(namespace, tablePrefix + "_" + name.getMethodName());
+    LOG.info(name.getMethodName());
 
-    final RSGroupInfo RSGroupInfo = addGroup("testMisplacedRegions", 1);
+    final RSGroupInfo rsGroupInfo = addGroup(name.getMethodName(), 1);
 
     TEST_UTIL.createMultiRegionTable(tableName, new byte[] { 'f' }, 15);
     TEST_UTIL.waitUntilAllRegionsAssigned(tableName);
-
-    rsGroupAdminEndpoint.getGroupInfoManager().moveTables(Sets.newHashSet(tableName),
-      RSGroupInfo.getName());
+    TEST_UTIL.getAdmin().modifyNamespace(NamespaceDescriptor.create(namespace)
+        .addConfiguration(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP, rsGroupInfo.getName()).build());
 
     admin.balancerSwitch(true, true);
-    assertTrue(rsGroupAdmin.balanceRSGroup(RSGroupInfo.getName()));
+    assertTrue(rsGroupAdmin.balanceRSGroup(rsGroupInfo.getName()));
     admin.balancerSwitch(false, true);
     assertTrue(observer.preBalanceRSGroupCalled);
     assertTrue(observer.postBalanceRSGroupCalled);
@@ -174,7 +174,7 @@ public class TestRSGroupsBalance extends TestRSGroupsBase {
       @Override
       public boolean evaluate() throws Exception {
         ServerName serverName =
-          ServerName.valueOf(RSGroupInfo.getServers().iterator().next().toString(), 1);
+            ServerName.valueOf(rsGroupInfo.getServers().iterator().next().toString(), 1);
         return admin.getConnection().getAdmin().getRegions(serverName).size() == 15;
       }
     });
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBase.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBase.java
index c5520cf..464410f 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBase.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsBase.java
@@ -76,7 +76,7 @@ public abstract class TestRSGroupsBase {
   protected static HBaseTestingUtility TEST_UTIL;
   protected static Admin admin;
   protected static HBaseCluster cluster;
-  protected static RSGroupAdmin rsGroupAdmin;
+  protected static RSGroupAdminClient rsGroupAdmin;
   protected static HMaster master;
   protected boolean INIT = false;
   protected static RSGroupAdminEndpoint rsGroupAdminEndpoint;
@@ -190,8 +190,8 @@ public abstract class TestRSGroupsBase {
     RSGroupInfo defaultInfo = rsGroupAdmin.getRSGroupInfo(RSGroupInfo.DEFAULT_GROUP);
     rsGroupAdmin.addRSGroup(groupName);
     Set<Address> set = new HashSet<>();
-    for(Address server: defaultInfo.getServers()) {
-      if(set.size() == serverCount) {
+    for (Address server : defaultInfo.getServers()) {
+      if (set.size() == serverCount) {
         break;
       }
       set.add(server);
@@ -224,7 +224,7 @@ public abstract class TestRSGroupsBase {
   }
 
   public void deleteGroups() throws IOException {
-    RSGroupAdmin groupAdmin = new RSGroupAdminClient(TEST_UTIL.getConnection());
+    RSGroupAdminClient groupAdmin = new RSGroupAdminClient(TEST_UTIL.getConnection());
     for(RSGroupInfo group: groupAdmin.listRSGroups()) {
       if(!group.getName().equals(RSGroupInfo.DEFAULT_GROUP)) {
         groupAdmin.moveTables(group.getTables(), RSGroupInfo.DEFAULT_GROUP);
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsOfflineMode.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsOfflineMode.java
index 60887e4..d3577f2 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsOfflineMode.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/TestRSGroupsOfflineMode.java
@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.hbase.rsgroup;
 
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 
 import org.apache.hadoop.hbase.HBaseClassTestRule;
@@ -113,7 +112,7 @@ public class TestRSGroupsOfflineMode {
     final HRegionServer groupRS = ((MiniHBaseCluster) cluster).getRegionServer(1);
     final HRegionServer failoverRS = ((MiniHBaseCluster) cluster).getRegionServer(2);
     String newGroup = "my_group";
-    RSGroupAdmin groupAdmin = new RSGroupAdminClient(TEST_UTIL.getConnection());
+    RSGroupAdminClient groupAdmin = new RSGroupAdminClient(TEST_UTIL.getConnection());
     groupAdmin.addRSGroup(newGroup);
     if (master.getAssignmentManager().getRegionStates().getRegionAssignments()
       .containsValue(failoverRS.getServerName())) {
@@ -168,9 +167,6 @@ public class TestRSGroupsOfflineMode {
       .getMasterCoprocessorHost().findCoprocessor(RSGroupAdminEndpoint.class).getGroupInfoManager();
     // Make sure balancer is in offline mode, since this is what we're testing.
     assertFalse(groupMgr.isOnline());
-    // Verify the group affiliation that's loaded from ZK instead of tables.
-    assertEquals(newGroup, groupMgr.getRSGroupOfTable(RSGroupInfoManagerImpl.RSGROUP_TABLE_NAME));
-    assertEquals(RSGroupInfo.DEFAULT_GROUP, groupMgr.getRSGroupOfTable(failoverTable));
     // Kill final regionserver to see the failover happens for all tables except GROUP table since
     // it's group does not have any online RS.
     killRS.stop("die");
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/VerifyingRSGroupAdminClient.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/VerifyingRSGroupAdminClient.java
index fcaf1a7..a8cd277 100644
--- a/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/VerifyingRSGroupAdminClient.java
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/rsgroup/VerifyingRSGroupAdminClient.java
@@ -17,17 +17,26 @@
  */
 package org.apache.hadoop.hbase.rsgroup;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.client.ResultScanner;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.Table;
+import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.exceptions.DeserializationException;
 import org.apache.hadoop.hbase.net.Address;
 import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
@@ -37,22 +46,20 @@ import org.apache.hadoop.hbase.zookeeper.ZKWatcher;
 import org.apache.hadoop.hbase.zookeeper.ZNodePaths;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.zookeeper.KeeperException;
-import org.junit.Assert;
 
 import org.apache.hbase.thirdparty.com.google.common.collect.Maps;
 import org.apache.hbase.thirdparty.com.google.common.collect.Sets;
 
 @InterfaceAudience.Private
-public class VerifyingRSGroupAdminClient implements RSGroupAdmin {
-  private Table table;
+public class VerifyingRSGroupAdminClient extends RSGroupAdminClient {
+  private Connection conn;
   private ZKWatcher zkw;
-  private RSGroupAdmin wrapped;
+  private RSGroupAdminClient wrapped;
 
-  public VerifyingRSGroupAdminClient(RSGroupAdmin RSGroupAdmin, Configuration conf)
+  public VerifyingRSGroupAdminClient(RSGroupAdminClient RSGroupAdmin, Configuration conf)
       throws IOException {
     wrapped = RSGroupAdmin;
-    table = ConnectionFactory.createConnection(conf)
-        .getTable(RSGroupInfoManagerImpl.RSGROUP_TABLE_NAME);
+    conn = ConnectionFactory.createConnection(conf);
     zkw = new ZKWatcher(conf, this.getClass().getSimpleName(), null);
   }
 
@@ -121,31 +128,41 @@ public class VerifyingRSGroupAdminClient implements RSGroupAdmin {
   public void verify() throws IOException {
     Map<String, RSGroupInfo> groupMap = Maps.newHashMap();
     Set<RSGroupInfo> zList = Sets.newHashSet();
-
-    for (Result result : table.getScanner(new Scan())) {
-      RSGroupProtos.RSGroupInfo proto =
-          RSGroupProtos.RSGroupInfo.parseFrom(
-              result.getValue(
-                  RSGroupInfoManagerImpl.META_FAMILY_BYTES,
-                  RSGroupInfoManagerImpl.META_QUALIFIER_BYTES));
-      groupMap.put(proto.getName(), ProtobufUtil.toGroupInfo(proto));
+    List<TableDescriptor> tds = new ArrayList<>();
+    try (Admin admin = conn.getAdmin()) {
+      tds.addAll(admin.listTableDescriptors());
+      tds.addAll(admin.listTableDescriptorsByNamespace(NamespaceDescriptor.SYSTEM_NAMESPACE_NAME));
+    }
+    try (Table table = conn.getTable(RSGroupInfoManagerImpl.RSGROUP_TABLE_NAME);
+        ResultScanner scanner = table.getScanner(new Scan())) {
+      for (;;) {
+        Result result = scanner.next();
+        if (result == null) {
+          break;
+        }
+        RSGroupProtos.RSGroupInfo proto = RSGroupProtos.RSGroupInfo.parseFrom(result.getValue(
+          RSGroupInfoManagerImpl.META_FAMILY_BYTES, RSGroupInfoManagerImpl.META_QUALIFIER_BYTES));
+        RSGroupInfo rsGroupInfo = ProtobufUtil.toGroupInfo(proto);
+        groupMap.put(proto.getName(), RSGroupUtil.fillTables(rsGroupInfo, tds));
+      }
     }
-    Assert.assertEquals(Sets.newHashSet(groupMap.values()),
-        Sets.newHashSet(wrapped.listRSGroups()));
+    assertEquals(Sets.newHashSet(groupMap.values()), Sets.newHashSet(wrapped.listRSGroups()));
     try {
       String groupBasePath = ZNodePaths.joinZNode(zkw.getZNodePaths().baseZNode, "rsgroup");
-      for(String znode: ZKUtil.listChildrenNoWatch(zkw, groupBasePath)) {
+      for (String znode : ZKUtil.listChildrenNoWatch(zkw, groupBasePath)) {
         byte[] data = ZKUtil.getData(zkw, ZNodePaths.joinZNode(groupBasePath, znode));
-        if(data.length > 0) {
+        if (data.length > 0) {
           ProtobufUtil.expectPBMagicPrefix(data);
-          ByteArrayInputStream bis = new ByteArrayInputStream(
-              data, ProtobufUtil.lengthOfPBMagic(), data.length);
-          zList.add(ProtobufUtil.toGroupInfo(RSGroupProtos.RSGroupInfo.parseFrom(bis)));
+          ByteArrayInputStream bis =
+              new ByteArrayInputStream(data, ProtobufUtil.lengthOfPBMagic(), data.length);
+          RSGroupInfo rsGroupInfo =
+              ProtobufUtil.toGroupInfo(RSGroupProtos.RSGroupInfo.parseFrom(bis));
+          zList.add(RSGroupUtil.fillTables(rsGroupInfo, tds));
         }
       }
-      Assert.assertEquals(zList.size(), groupMap.size());
-      for(RSGroupInfo RSGroupInfo : zList) {
-        Assert.assertTrue(groupMap.get(RSGroupInfo.getName()).equals(RSGroupInfo));
+      assertEquals(zList.size(), groupMap.size());
+      for (RSGroupInfo rsGroupInfo : zList) {
+        assertTrue(groupMap.get(rsGroupInfo.getName()).equals(rsGroupInfo));
       }
     } catch (KeeperException e) {
       throw new IOException("ZK verification failed", e);


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