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Date: Tue, 22 Mar 2016 02:41:47 -0000
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Subject: [18/50] [abbrv] hbase git commit: HBASE-15128 Disable region splits
 and merges switch in master

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java
index 4371739..0240a67 100644
--- a/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java
+++ b/hbase-protocol/src/main/java/org/apache/hadoop/hbase/protobuf/generated/ZooKeeperProtos.java
@@ -8196,6 +8196,450 @@ public final class ZooKeeperProtos {
     // @@protoc_insertion_point(class_scope:hbase.pb.TableLock)
   }
 
+  public interface SwitchStateOrBuilder
+      extends com.google.protobuf.MessageOrBuilder {
+
+    // optional bool enabled = 1;
+    /**
+     * <code>optional bool enabled = 1;</code>
+     */
+    boolean hasEnabled();
+    /**
+     * <code>optional bool enabled = 1;</code>
+     */
+    boolean getEnabled();
+  }
+  /**
+   * Protobuf type {@code hbase.pb.SwitchState}
+   *
+   * <pre>
+   **
+   * State of the switch.
+   * </pre>
+   */
+  public static final class SwitchState extends
+      com.google.protobuf.GeneratedMessage
+      implements SwitchStateOrBuilder {
+    // Use SwitchState.newBuilder() to construct.
+    private SwitchState(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
+      super(builder);
+      this.unknownFields = builder.getUnknownFields();
+    }
+    private SwitchState(boolean noInit) { this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance(); }
+
+    private static final SwitchState defaultInstance;
+    public static SwitchState getDefaultInstance() {
+      return defaultInstance;
+    }
+
+    public SwitchState getDefaultInstanceForType() {
+      return defaultInstance;
+    }
+
+    private final com.google.protobuf.UnknownFieldSet unknownFields;
+    @java.lang.Override
+    public final com.google.protobuf.UnknownFieldSet
+        getUnknownFields() {
+      return this.unknownFields;
+    }
+    private SwitchState(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      initFields();
+      int mutable_bitField0_ = 0;
+      com.google.protobuf.UnknownFieldSet.Builder unknownFields =
+          com.google.protobuf.UnknownFieldSet.newBuilder();
+      try {
+        boolean done = false;
+        while (!done) {
+          int tag = input.readTag();
+          switch (tag) {
+            case 0:
+              done = true;
+              break;
+            default: {
+              if (!parseUnknownField(input, unknownFields,
+                                     extensionRegistry, tag)) {
+                done = true;
+              }
+              break;
+            }
+            case 8: {
+              bitField0_ |= 0x00000001;
+              enabled_ = input.readBool();
+              break;
+            }
+          }
+        }
+      } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+        throw e.setUnfinishedMessage(this);
+      } catch (java.io.IOException e) {
+        throw new com.google.protobuf.InvalidProtocolBufferException(
+            e.getMessage()).setUnfinishedMessage(this);
+      } finally {
+        this.unknownFields = unknownFields.build();
+        makeExtensionsImmutable();
+      }
+    }
+    public static final com.google.protobuf.Descriptors.Descriptor
+        getDescriptor() {
+      return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.internal_static_hbase_pb_SwitchState_descriptor;
+    }
+
+    protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+        internalGetFieldAccessorTable() {
+      return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.internal_static_hbase_pb_SwitchState_fieldAccessorTable
+          .ensureFieldAccessorsInitialized(
+              org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.class, org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.Builder.class);
+    }
+
+    public static com.google.protobuf.Parser<SwitchState> PARSER =
+        new com.google.protobuf.AbstractParser<SwitchState>() {
+      public SwitchState parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new SwitchState(input, extensionRegistry);
+      }
+    };
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<SwitchState> getParserForType() {
+      return PARSER;
+    }
+
+    private int bitField0_;
+    // optional bool enabled = 1;
+    public static final int ENABLED_FIELD_NUMBER = 1;
+    private boolean enabled_;
+    /**
+     * <code>optional bool enabled = 1;</code>
+     */
+    public boolean hasEnabled() {
+      return ((bitField0_ & 0x00000001) == 0x00000001);
+    }
+    /**
+     * <code>optional bool enabled = 1;</code>
+     */
+    public boolean getEnabled() {
+      return enabled_;
+    }
+
+    private void initFields() {
+      enabled_ = false;
+    }
+    private byte memoizedIsInitialized = -1;
+    public final boolean isInitialized() {
+      byte isInitialized = memoizedIsInitialized;
+      if (isInitialized != -1) return isInitialized == 1;
+
+      memoizedIsInitialized = 1;
+      return true;
+    }
+
+    public void writeTo(com.google.protobuf.CodedOutputStream output)
+                        throws java.io.IOException {
+      getSerializedSize();
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        output.writeBool(1, enabled_);
+      }
+      getUnknownFields().writeTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public int getSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeBoolSize(1, enabled_);
+      }
+      size += getUnknownFields().getSerializedSize();
+      memoizedSerializedSize = size;
+      return size;
+    }
+
+    private static final long serialVersionUID = 0L;
+    @java.lang.Override
+    protected java.lang.Object writeReplace()
+        throws java.io.ObjectStreamException {
+      return super.writeReplace();
+    }
+
+    @java.lang.Override
+    public boolean equals(final java.lang.Object obj) {
+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState)) {
+        return super.equals(obj);
+      }
+      org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState other = (org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState) obj;
+
+      boolean result = true;
+      result = result && (hasEnabled() == other.hasEnabled());
+      if (hasEnabled()) {
+        result = result && (getEnabled()
+            == other.getEnabled());
+      }
+      result = result &&
+          getUnknownFields().equals(other.getUnknownFields());
+      return result;
+    }
+
+    private int memoizedHashCode = 0;
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptorForType().hashCode();
+      if (hasEnabled()) {
+        hash = (37 * hash) + ENABLED_FIELD_NUMBER;
+        hash = (53 * hash) + hashBoolean(getEnabled());
+      }
+      hash = (29 * hash) + getUnknownFields().hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseDelimitedFrom(input, extensionRegistry);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input);
+    }
+    public static org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return PARSER.parseFrom(input, extensionRegistry);
+    }
+
+    public static Builder newBuilder() { return Builder.create(); }
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder(org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState prototype) {
+      return newBuilder().mergeFrom(prototype);
+    }
+    public Builder toBuilder() { return newBuilder(this); }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * Protobuf type {@code hbase.pb.SwitchState}
+     *
+     * <pre>
+     **
+     * State of the switch.
+     * </pre>
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessage.Builder<Builder>
+       implements org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchStateOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.internal_static_hbase_pb_SwitchState_descriptor;
+      }
+
+      protected com.google.protobuf.GeneratedMessage.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.internal_static_hbase_pb_SwitchState_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.class, org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.Builder.class);
+      }
+
+      // Construct using org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessage.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
+        }
+      }
+      private static Builder create() {
+        return new Builder();
+      }
+
+      public Builder clear() {
+        super.clear();
+        enabled_ = false;
+        bitField0_ = (bitField0_ & ~0x00000001);
+        return this;
+      }
+
+      public Builder clone() {
+        return create().mergeFrom(buildPartial());
+      }
+
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.internal_static_hbase_pb_SwitchState_descriptor;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.getDefaultInstance();
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState build() {
+        org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      public org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState buildPartial() {
+        org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState result = new org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState(this);
+        int from_bitField0_ = bitField0_;
+        int to_bitField0_ = 0;
+        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
+          to_bitField0_ |= 0x00000001;
+        }
+        result.enabled_ = enabled_;
+        result.bitField0_ = to_bitField0_;
+        onBuilt();
+        return result;
+      }
+
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState) {
+          return mergeFrom((org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState other) {
+        if (other == org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState.getDefaultInstance()) return this;
+        if (other.hasEnabled()) {
+          setEnabled(other.getEnabled());
+        }
+        this.mergeUnknownFields(other.getUnknownFields());
+        return this;
+      }
+
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState) e.getUnfinishedMessage();
+          throw e;
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      // optional bool enabled = 1;
+      private boolean enabled_ ;
+      /**
+       * <code>optional bool enabled = 1;</code>
+       */
+      public boolean hasEnabled() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
+      }
+      /**
+       * <code>optional bool enabled = 1;</code>
+       */
+      public boolean getEnabled() {
+        return enabled_;
+      }
+      /**
+       * <code>optional bool enabled = 1;</code>
+       */
+      public Builder setEnabled(boolean value) {
+        bitField0_ |= 0x00000001;
+        enabled_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional bool enabled = 1;</code>
+       */
+      public Builder clearEnabled() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        enabled_ = false;
+        onChanged();
+        return this;
+      }
+
+      // @@protoc_insertion_point(builder_scope:hbase.pb.SwitchState)
+    }
+
+    static {
+      defaultInstance = new SwitchState(true);
+      defaultInstance.initFields();
+    }
+
+    // @@protoc_insertion_point(class_scope:hbase.pb.SwitchState)
+  }
+
   private static com.google.protobuf.Descriptors.Descriptor
     internal_static_hbase_pb_MetaRegionServer_descriptor;
   private static
@@ -8246,6 +8690,11 @@ public final class ZooKeeperProtos {
   private static
     com.google.protobuf.GeneratedMessage.FieldAccessorTable
       internal_static_hbase_pb_TableLock_fieldAccessorTable;
+  private static com.google.protobuf.Descriptors.Descriptor
+    internal_static_hbase_pb_SwitchState_descriptor;
+  private static
+    com.google.protobuf.GeneratedMessage.FieldAccessorTable
+      internal_static_hbase_pb_SwitchState_fieldAccessorTable;
 
   public static com.google.protobuf.Descriptors.FileDescriptor
       getDescriptor() {
@@ -8286,9 +8735,10 @@ public final class ZooKeeperProtos {
       "\022\'\n\ntable_name\030\001 \001(\0132\023.hbase.pb.TableNam" +
       "e\022(\n\nlock_owner\030\002 \001(\0132\024.hbase.pb.ServerN",
       "ame\022\021\n\tthread_id\030\003 \001(\003\022\021\n\tis_shared\030\004 \001(" +
-      "\010\022\017\n\007purpose\030\005 \001(\t\022\023\n\013create_time\030\006 \001(\003B" +
-      "E\n*org.apache.hadoop.hbase.protobuf.gene" +
-      "ratedB\017ZooKeeperProtosH\001\210\001\001\240\001\001"
+      "\010\022\017\n\007purpose\030\005 \001(\t\022\023\n\013create_time\030\006 \001(\003\"" +
+      "\036\n\013SwitchState\022\017\n\007enabled\030\001 \001(\010BE\n*org.a" +
+      "pache.hadoop.hbase.protobuf.generatedB\017Z" +
+      "ooKeeperProtosH\001\210\001\001\240\001\001"
     };
     com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner =
       new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
@@ -8355,6 +8805,12 @@ public final class ZooKeeperProtos {
             com.google.protobuf.GeneratedMessage.FieldAccessorTable(
               internal_static_hbase_pb_TableLock_descriptor,
               new java.lang.String[] { "TableName", "LockOwner", "ThreadId", "IsShared", "Purpose", "CreateTime", });
+          internal_static_hbase_pb_SwitchState_descriptor =
+            getDescriptor().getMessageTypes().get(10);
+          internal_static_hbase_pb_SwitchState_fieldAccessorTable = new
+            com.google.protobuf.GeneratedMessage.FieldAccessorTable(
+              internal_static_hbase_pb_SwitchState_descriptor,
+              new java.lang.String[] { "Enabled", });
           return null;
         }
       };

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-protocol/src/main/protobuf/Master.proto
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/protobuf/Master.proto b/hbase-protocol/src/main/protobuf/Master.proto
index aa31a5e..79bb862 100644
--- a/hbase-protocol/src/main/protobuf/Master.proto
+++ b/hbase-protocol/src/main/protobuf/Master.proto
@@ -279,6 +279,29 @@ message IsBalancerEnabledResponse {
   required bool enabled = 1;
 }
 
+enum MasterSwitchType {
+  SPLIT = 0;
+  MERGE = 1;
+}
+
+message SetSplitOrMergeEnabledRequest {
+  required bool enabled = 1;
+  optional bool synchronous = 2;
+  repeated MasterSwitchType switch_types = 3;
+}
+
+message SetSplitOrMergeEnabledResponse {
+  repeated bool prev_value = 1;
+}
+
+message IsSplitOrMergeEnabledRequest {
+  required MasterSwitchType switch_type = 1;
+}
+
+message IsSplitOrMergeEnabledResponse {
+  required bool enabled = 1;
+}
+
 message NormalizeRequest {
 }
 
@@ -633,6 +656,19 @@ service MasterService {
     returns(IsBalancerEnabledResponse);
 
   /**
+   * Turn the split or merge switch on or off.
+   * If synchronous is true, it waits until current operation call, if outstanding, to return.
+   */
+  rpc SetSplitOrMergeEnabled(SetSplitOrMergeEnabledRequest)
+    returns(SetSplitOrMergeEnabledResponse);
+
+  /**
+   * Query whether the split or merge switch is on/off.
+   */
+  rpc IsSplitOrMergeEnabled(IsSplitOrMergeEnabledRequest)
+    returns(IsSplitOrMergeEnabledResponse);
+
+  /**
    * Run region normalizer. Can NOT run for various reasons. Check logs.
    */
   rpc Normalize(NormalizeRequest)

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-protocol/src/main/protobuf/ZooKeeper.proto
----------------------------------------------------------------------
diff --git a/hbase-protocol/src/main/protobuf/ZooKeeper.proto b/hbase-protocol/src/main/protobuf/ZooKeeper.proto
index 54652af..4963c09 100644
--- a/hbase-protocol/src/main/protobuf/ZooKeeper.proto
+++ b/hbase-protocol/src/main/protobuf/ZooKeeper.proto
@@ -153,3 +153,10 @@ message TableLock {
   optional string purpose = 5;
   optional int64 create_time = 6;
 }
+
+/**
+ * State of the switch.
+ */
+message SwitchState {
+  optional bool enabled = 1;
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
index 53a080e..1110db3 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
@@ -62,6 +62,7 @@ import org.apache.hadoop.hbase.RegionStateListener;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.TableNotFoundException;
+import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.RegionReplicaUtil;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.TableState;
@@ -2353,6 +2354,11 @@ public class AssignmentManager {
       return hri.getShortNameToLog() + " is not opening on " + serverName;
     }
 
+    if (!((HMaster)server).getSplitOrMergeTracker().isSplitOrMergeEnabled(
+            Admin.MasterSwitchType.SPLIT)) {
+      return "split switch is off!";
+    }
+
     // Just return in case of retrying
     if (current.isSplitting()) {
       return null;
@@ -2511,6 +2517,10 @@ public class AssignmentManager {
       return "Merging daughter region already exists, p=" + current;
     }
 
+    if (!((HMaster)server).getSplitOrMergeTracker().isSplitOrMergeEnabled(
+            Admin.MasterSwitchType.MERGE)) {
+      return "merge switch is off!";
+    }
     // Just return in case of retrying
     if (current != null) {
       return null;

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
----------------------------------------------------------------------
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 5d8c325..6806c2d 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
@@ -76,6 +76,7 @@ import org.apache.hadoop.hbase.TableNotDisabledException;
 import org.apache.hadoop.hbase.TableNotFoundException;
 import org.apache.hadoop.hbase.UnknownRegionException;
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.RegionReplicaUtil;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.TableState;
@@ -155,6 +156,7 @@ import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker;
 import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
 import org.apache.hadoop.hbase.zookeeper.RegionNormalizerTracker;
 import org.apache.hadoop.hbase.zookeeper.RegionServerTracker;
+import org.apache.hadoop.hbase.zookeeper.SplitOrMergeTrackerManager;
 import org.apache.hadoop.hbase.zookeeper.ZKClusterId;
 import org.apache.hadoop.hbase.zookeeper.ZKUtil;
 import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
@@ -253,6 +255,9 @@ public class HMaster extends HRegionServer implements MasterServices {
   // Tracker for load balancer state
   LoadBalancerTracker loadBalancerTracker;
 
+  // Tracker for split and merge state
+  SplitOrMergeTrackerManager splitOrMergeTracker;
+
   // Tracker for region normalizer state
   private RegionNormalizerTracker regionNormalizerTracker;
 
@@ -578,8 +583,13 @@ public class HMaster extends HRegionServer implements MasterServices {
     this.normalizer.setMasterServices(this);
     this.loadBalancerTracker = new LoadBalancerTracker(zooKeeper, this);
     this.loadBalancerTracker.start();
+
     this.regionNormalizerTracker = new RegionNormalizerTracker(zooKeeper, this);
     this.regionNormalizerTracker.start();
+
+    this.splitOrMergeTracker = new SplitOrMergeTrackerManager(zooKeeper, conf, this);
+    this.splitOrMergeTracker.start();
+
     this.assignmentManager = new AssignmentManager(this, serverManager,
       this.balancer, this.service, this.metricsMaster,
       this.tableLockManager, tableStateManager);
@@ -2783,6 +2793,20 @@ public class HMaster extends HRegionServer implements MasterServices {
     return null == regionNormalizerTracker? false: regionNormalizerTracker.isNormalizerOn();
   }
 
+
+  /**
+   * Queries the state of the {@link SplitOrMergeTrackerManager}. If it is not initialized,
+   * false is returned. If switchType is illegal, false will return.
+   * @param switchType see {@link org.apache.hadoop.hbase.client.Admin.MasterSwitchType}
+   * @return The state of the switch
+   */
+  public boolean isSplitOrMergeEnabled(Admin.MasterSwitchType switchType) {
+    if (null == splitOrMergeTracker) {
+      return false;
+    }
+    return splitOrMergeTracker.isSplitOrMergeEnabled(switchType);
+  }
+
   /**
    * Fetch the configured {@link LoadBalancer} class name. If none is set, a default is returned.
    *
@@ -2799,4 +2823,8 @@ public class HMaster extends HRegionServer implements MasterServices {
   public RegionNormalizerTracker getRegionNormalizerTracker() {
     return regionNormalizerTracker;
   }
+
+  public SplitOrMergeTrackerManager getSplitOrMergeTracker() {
+    return splitOrMergeTracker;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
index 1dd4c14..1c770d1 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRpcServices.java
@@ -41,6 +41,7 @@ import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.UnknownRegionException;
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.client.Admin;
 import org.apache.hadoop.hbase.client.TableState;
 import org.apache.hadoop.hbase.errorhandling.ForeignException;
 import org.apache.hadoop.hbase.exceptions.MergeRegionException;
@@ -1506,6 +1507,35 @@ public class MasterRpcServices extends RSRpcServices
   }
 
   @Override
+  public SetSplitOrMergeEnabledResponse setSplitOrMergeEnabled(RpcController controller,
+    SetSplitOrMergeEnabledRequest request) throws ServiceException {
+    SetSplitOrMergeEnabledResponse.Builder response = SetSplitOrMergeEnabledResponse.newBuilder();
+    try {
+      master.checkInitialized();
+      for (MasterSwitchType masterSwitchType : request.getSwitchTypesList()) {
+        Admin.MasterSwitchType switchType = convert(masterSwitchType);
+        boolean oldValue = master.isSplitOrMergeEnabled(switchType);
+        boolean newValue = request.getEnabled();
+        master.getSplitOrMergeTracker().setSplitOrMergeEnabled(newValue, switchType);
+        response.addPrevValue(oldValue);
+      }
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    } catch (KeeperException e) {
+      throw new ServiceException(e);
+    }
+    return response.build();
+  }
+
+  @Override
+  public IsSplitOrMergeEnabledResponse isSplitOrMergeEnabled(RpcController controller,
+    IsSplitOrMergeEnabledRequest request) throws ServiceException {
+    IsSplitOrMergeEnabledResponse.Builder response = IsSplitOrMergeEnabledResponse.newBuilder();
+    response.setEnabled(master.isSplitOrMergeEnabled(convert(request.getSwitchType())));
+    return response.build();
+  }
+
+  @Override
   public NormalizeResponse normalize(RpcController controller,
       NormalizeRequest request) throws ServiceException {
     try {
@@ -1574,4 +1604,16 @@ public class MasterRpcServices extends RSRpcServices
     }
     return response.build();
   }
+
+  private Admin.MasterSwitchType convert(MasterSwitchType switchType) {
+    switch (switchType) {
+      case SPLIT:
+        return Admin.MasterSwitchType.SPLIT;
+      case MERGE:
+        return Admin.MasterSwitchType.MERGE;
+      default:
+        break;
+    }
+    return null;
+  }
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
index a9113ec..93287ad 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
@@ -235,6 +235,7 @@ public class HBaseFsck extends Configured implements Closeable {
   private long timelag = DEFAULT_TIME_LAG; // tables whose modtime is older
   private static boolean forceExclusive = false; // only this hbck can modify HBase
   private static boolean disableBalancer = false; // disable load balancer to keep regions stable
+  private static boolean disableSplitAndMerge = false; // disable split and merge
   private boolean fixAssignments = false; // fix assignment errors?
   private boolean fixMeta = false; // fix meta errors?
   private boolean checkHdfs = true; // load and check fs consistency?
@@ -683,6 +684,11 @@ public class HBaseFsck extends Configured implements Closeable {
     if (shouldDisableBalancer()) {
       oldBalancer = admin.setBalancerRunning(false, true);
     }
+    boolean[] oldSplitAndMerge = null;
+    if (shouldDisableSplitAndMerge()) {
+      oldSplitAndMerge = admin.setSplitOrMergeEnabled(false, false,
+        Admin.MasterSwitchType.SPLIT, Admin.MasterSwitchType.MERGE);
+    }
 
     try {
       onlineConsistencyRepair();
@@ -694,6 +700,17 @@ public class HBaseFsck extends Configured implements Closeable {
       if (shouldDisableBalancer() && oldBalancer) {
         admin.setBalancerRunning(oldBalancer, false);
       }
+
+      if (shouldDisableSplitAndMerge()) {
+        if (oldSplitAndMerge != null) {
+          if (oldSplitAndMerge[0]) {
+            admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.SPLIT);
+          }
+          if (oldSplitAndMerge[1]) {
+            admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.MERGE);
+          }
+        }
+      }
     }
 
     if (checkRegionBoundaries) {
@@ -4184,6 +4201,13 @@ public class HBaseFsck extends Configured implements Closeable {
   }
 
   /**
+   * Disable the split and merge
+   */
+  public static void setDisableSplitAndMerge() {
+    disableSplitAndMerge = true;
+  }
+
+  /**
    * The balancer should be disabled if we are modifying HBase.
    * It can be disabled if you want to prevent region movement from causing
    * false positives.
@@ -4193,6 +4217,15 @@ public class HBaseFsck extends Configured implements Closeable {
   }
 
   /**
+   * The split and merge should be disabled if we are modifying HBase.
+   * It can be disabled if you want to prevent region movement from causing
+   * false positives.
+   */
+  public boolean shouldDisableSplitAndMerge() {
+    return fixAny || disableSplitAndMerge;
+  }
+
+  /**
    * Set summary mode.
    * Print only summary of the tables and status (OK or INCONSISTENT)
    */
@@ -4551,6 +4584,8 @@ public class HBaseFsck extends Configured implements Closeable {
         setForceExclusive();
       } else if (cmd.equals("-disableBalancer")) {
         setDisableBalancer();
+      }  else if (cmd.equals("-disableSplitAndMerge")) {
+        setDisableSplitAndMerge();
       } else if (cmd.equals("-timelag")) {
         if (i == args.length - 1) {
           errors.reportError(ERROR_CODE.WRONG_USAGE, "HBaseFsck: -timelag needs a value.");

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTrackerManager.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTrackerManager.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTrackerManager.java
new file mode 100644
index 0000000..1495dd1
--- /dev/null
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/SplitOrMergeTrackerManager.java
@@ -0,0 +1,151 @@
+/**
+ * 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.zookeeper;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.Abortable;
+import org.apache.hadoop.hbase.classification.InterfaceAudience;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.exceptions.DeserializationException;
+import org.apache.hadoop.hbase.protobuf.ProtobufUtil;
+import org.apache.hadoop.hbase.protobuf.generated.ZooKeeperProtos.SwitchState;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.zookeeper.KeeperException;
+
+
+/**
+ * Tracks the switch of split and merge states in ZK
+ *
+ */
+@InterfaceAudience.Private
+public class SplitOrMergeTrackerManager {
+
+  private String splitZnode;
+  private String mergeZnode;
+
+  private SwitchStateTracker splitStateTracker;
+  private SwitchStateTracker mergeStateTracker;
+
+  public SplitOrMergeTrackerManager(ZooKeeperWatcher watcher, Configuration conf,
+                                    Abortable abortable) {
+    try {
+      if (ZKUtil.checkExists(watcher, watcher.getSwitchZNode()) < 0) {
+        ZKUtil.createAndFailSilent(watcher, watcher.getSwitchZNode());
+      }
+    } catch (KeeperException e) {
+      throw new RuntimeException(e);
+    }
+    splitZnode = ZKUtil.joinZNode(watcher.getSwitchZNode(),
+      conf.get("zookeeper.znode.switch.split", "split"));
+    mergeZnode = ZKUtil.joinZNode(watcher.getSwitchZNode(),
+      conf.get("zookeeper.znode.switch.merge", "merge"));
+    splitStateTracker = new SwitchStateTracker(watcher, splitZnode, abortable);
+    mergeStateTracker = new SwitchStateTracker(watcher, mergeZnode, abortable);
+  }
+
+  public void start() {
+    splitStateTracker.start();
+    mergeStateTracker.start();
+  }
+
+  public boolean isSplitOrMergeEnabled(Admin.MasterSwitchType switchType) {
+    switch (switchType) {
+      case SPLIT:
+        return splitStateTracker.isSwitchEnabled();
+      case MERGE:
+        return mergeStateTracker.isSwitchEnabled();
+      default:
+        break;
+    }
+    return false;
+  }
+
+  public void setSplitOrMergeEnabled(boolean enabled, Admin.MasterSwitchType switchType)
+    throws KeeperException {
+    switch (switchType) {
+      case SPLIT:
+        splitStateTracker.setSwitchEnabled(enabled);
+        break;
+      case MERGE:
+        mergeStateTracker.setSwitchEnabled(enabled);
+        break;
+      default:
+        break;
+    }
+  }
+
+  private static class SwitchStateTracker extends ZooKeeperNodeTracker {
+
+    public SwitchStateTracker(ZooKeeperWatcher watcher, String node, Abortable abortable) {
+      super(watcher, node, abortable);
+    }
+
+    /**
+     * Return true if the switch is on, false otherwise
+     */
+    public boolean isSwitchEnabled() {
+      byte [] upData = super.getData(false);
+      try {
+        // if data in ZK is null, use default of on.
+        return upData == null || parseFrom(upData).getEnabled();
+      } catch (DeserializationException dex) {
+        LOG.error("ZK state for LoadBalancer could not be parsed " + Bytes.toStringBinary(upData));
+        // return false to be safe.
+        return false;
+      }
+    }
+
+    /**
+     * Set the switch on/off
+     * @param enabled switch enabled or not?
+     * @throws KeeperException keepException will be thrown out
+     */
+    public void setSwitchEnabled(boolean enabled) throws KeeperException {
+      byte [] upData = toByteArray(enabled);
+      try {
+        ZKUtil.setData(watcher, node, upData);
+      } catch(KeeperException.NoNodeException nne) {
+        ZKUtil.createAndWatch(watcher, node, upData);
+      }
+      super.nodeDataChanged(node);
+    }
+
+    private byte [] toByteArray(boolean enabled) {
+      SwitchState.Builder builder = SwitchState.newBuilder();
+      builder.setEnabled(enabled);
+      return ProtobufUtil.prependPBMagic(builder.build().toByteArray());
+    }
+
+    private SwitchState parseFrom(byte [] bytes)
+      throws DeserializationException {
+      ProtobufUtil.expectPBMagicPrefix(bytes);
+      SwitchState.Builder builder = SwitchState.newBuilder();
+      try {
+        int magicLen = ProtobufUtil.lengthOfPBMagic();
+        ProtobufUtil.mergeFrom(builder, bytes, magicLen, bytes.length - magicLen);
+      } catch (IOException e) {
+        throw new DeserializationException(e);
+      }
+      return builder.build();
+    }
+  }
+
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestSplitOrMergeStatus.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestSplitOrMergeStatus.java b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestSplitOrMergeStatus.java
new file mode 100644
index 0000000..6405a14
--- /dev/null
+++ b/hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestSplitOrMergeStatus.java
@@ -0,0 +1,198 @@
+/**
+ * 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.client;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.hbase.HBaseTestingUtility;
+import org.apache.hadoop.hbase.HRegionInfo;
+import org.apache.hadoop.hbase.HRegionLocation;
+import org.apache.hadoop.hbase.MiniHBaseCluster;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.regionserver.HRegion;
+import org.apache.hadoop.hbase.regionserver.Region;
+import org.apache.hadoop.hbase.testclassification.ClientTests;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.hbase.util.JVMClusterUtil;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+@Category({MediumTests.class, ClientTests.class})
+public class TestSplitOrMergeStatus {
+
+  private static final Log LOG = LogFactory.getLog(TestSplitOrMergeStatus.class);
+  private final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
+  private static byte [] FAMILY = Bytes.toBytes("testFamily");
+
+  /**
+   * @throws java.lang.Exception
+   */
+  @BeforeClass
+  public static void setUpBeforeClass() throws Exception {
+    TEST_UTIL.startMiniCluster(2);
+  }
+
+  /**
+   * @throws java.lang.Exception
+   */
+  @AfterClass
+  public static void tearDownAfterClass() throws Exception {
+    TEST_UTIL.shutdownMiniCluster();
+  }
+
+  @Test
+  public void testSplitSwitch() throws Exception {
+    TableName name = TableName.valueOf("testSplitSwitch");
+    Table t = TEST_UTIL.createTable(name, FAMILY);
+    TEST_UTIL.loadTable(t, FAMILY, false);
+
+    RegionLocator locator = TEST_UTIL.getConnection().getRegionLocator(t.getName());
+    int orignalCount = locator.getAllRegionLocations().size();
+
+    Admin admin = TEST_UTIL.getAdmin();
+    initSwitchStatus(admin);
+    boolean[] results = admin.setSplitOrMergeEnabled(false, false, Admin.MasterSwitchType.SPLIT);
+    assertEquals(results.length, 1);
+    assertTrue(results[0]);
+    admin.split(t.getName());
+    int count = waitOnSplitOrMerge(t).size();
+    assertTrue(orignalCount == count);
+
+    results = admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.SPLIT);
+    assertEquals(results.length, 1);
+    assertFalse(results[0]);
+    admin.split(t.getName());
+    count = waitOnSplitOrMerge(t).size();
+    assertTrue(orignalCount<count);
+    admin.close();
+  }
+
+
+  @Test
+  public void testMergeSwitch() throws Exception {
+    TableName name = TableName.valueOf("testMergeSwitch");
+    Table t = TEST_UTIL.createTable(name, FAMILY);
+    TEST_UTIL.loadTable(t, FAMILY, false);
+
+    RegionLocator locator = TEST_UTIL.getConnection().getRegionLocator(t.getName());
+
+    Admin admin = TEST_UTIL.getAdmin();
+    initSwitchStatus(admin);
+    admin.split(t.getName());
+    waitOnSplitOrMerge(t); //Split the table to ensure we have two regions at least.
+
+    waitForMergable(admin, name);
+    int orignalCount = locator.getAllRegionLocations().size();
+    boolean[] results = admin.setSplitOrMergeEnabled(false, false, Admin.MasterSwitchType.MERGE);
+    assertEquals(results.length, 1);
+    assertTrue(results[0]);
+    List<HRegionInfo> regions = admin.getTableRegions(t.getName());
+    assertTrue(regions.size() > 1);
+    admin.mergeRegions(regions.get(0).getEncodedNameAsBytes(),
+      regions.get(1).getEncodedNameAsBytes(), true);
+    int count = waitOnSplitOrMerge(t).size();
+    assertTrue(orignalCount == count);
+
+    waitForMergable(admin, name);
+    results = admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.MERGE);
+    assertEquals(results.length, 1);
+    assertFalse(results[0]);
+    admin.mergeRegions(regions.get(0).getEncodedNameAsBytes(),
+      regions.get(1).getEncodedNameAsBytes(), true);
+    count = waitOnSplitOrMerge(t).size();
+    assertTrue(orignalCount>count);
+    admin.close();
+  }
+
+  @Test
+  public void testMultiSwitches() throws IOException {
+    Admin admin = TEST_UTIL.getAdmin();
+    boolean[] switches = admin.setSplitOrMergeEnabled(false, false,
+      Admin.MasterSwitchType.SPLIT, Admin.MasterSwitchType.MERGE);
+    for (boolean s : switches){
+      assertTrue(s);
+    }
+    assertFalse(admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.SPLIT));
+    assertFalse(admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.MERGE));
+    admin.close();
+  }
+
+  private void initSwitchStatus(Admin admin) throws IOException {
+    if (!admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.SPLIT)) {
+      admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.SPLIT);
+    }
+    if (!admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.MERGE)) {
+      admin.setSplitOrMergeEnabled(true, false, Admin.MasterSwitchType.MERGE);
+    }
+    assertTrue(admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.SPLIT));
+    assertTrue(admin.isSplitOrMergeEnabled(Admin.MasterSwitchType.MERGE));
+  }
+
+  private void waitForMergable(Admin admin, TableName t) throws InterruptedException, IOException {
+    // Wait for the Regions to be mergeable
+    MiniHBaseCluster miniCluster = TEST_UTIL.getMiniHBaseCluster();
+    int mergeable = 0;
+    while (mergeable < 2) {
+      Thread.sleep(100);
+      admin.majorCompact(t);
+      mergeable = 0;
+      for (JVMClusterUtil.RegionServerThread regionThread: miniCluster.getRegionServerThreads()) {
+        for (Region region: regionThread.getRegionServer().getOnlineRegions(t)) {
+          mergeable += ((HRegion)region).isMergeable() ? 1 : 0;
+        }
+      }
+    }
+  }
+
+  /*
+   * Wait on table split.  May return because we waited long enough on the split
+   * and it didn't happen.  Caller should check.
+   * @param t
+   * @return Map of table regions; caller needs to check table actually split.
+   */
+  private List<HRegionLocation> waitOnSplitOrMerge(final Table t)
+    throws IOException {
+    try (RegionLocator locator = TEST_UTIL.getConnection().getRegionLocator(t.getName())) {
+      List<HRegionLocation> regions = locator.getAllRegionLocations();
+      int originalCount = regions.size();
+      for (int i = 0; i < TEST_UTIL.getConfiguration().getInt("hbase.test.retries", 10); i++) {
+        Thread.currentThread();
+        try {
+          Thread.sleep(1000);
+        } catch (InterruptedException e) {
+          e.printStackTrace();
+        }
+        regions = locator.getAllRegionLocations();
+        if (regions.size() !=  originalCount)
+          break;
+      }
+      return regions;
+    }
+  }
+
+}

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-shell/src/main/ruby/hbase/admin.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/hbase/admin.rb b/hbase-shell/src/main/ruby/hbase/admin.rb
index 82f0700..40c3711 100644
--- a/hbase-shell/src/main/ruby/hbase/admin.rb
+++ b/hbase-shell/src/main/ruby/hbase/admin.rb
@@ -132,6 +132,38 @@ module Hbase
       end
     end
 
+    #----------------------------------------------------------------------------------------------
+    # Enable/disable one split or merge switch
+    # Returns previous switch setting.
+    def splitormerge_switch(type, enabled)
+      switch_type = nil
+      if type == 'SPLIT'
+        switch_type = org.apache.hadoop.hbase.client.Admin::MasterSwitchType::SPLIT
+      elsif type == 'MERGE'
+        switch_type = org.apache.hadoop.hbase.client.Admin::MasterSwitchType::MERGE
+      else
+        raise ArgumentError, 'only SPLIT or MERGE accepted for type!'
+      end
+      @admin.setSplitOrMergeEnabled(
+        java.lang.Boolean.valueOf(enabled), java.lang.Boolean.valueOf(false),
+        switch_type)[0]
+    end
+
+    #----------------------------------------------------------------------------------------------
+    # Query the current state of the split or merge switch.
+    # Returns the switch's state (true is enabled).
+    def splitormerge_enabled(type)
+      switch_type = nil
+      if type == 'SPLIT'
+        switch_type = org.apache.hadoop.hbase.client.Admin::MasterSwitchType::SPLIT
+      elsif type == 'MERGE'
+        switch_type = org.apache.hadoop.hbase.client.Admin::MasterSwitchType::MERGE
+      else
+        raise ArgumentError, 'only SPLIT or MERGE accepted for type!'
+      end
+      @admin.isSplitOrMergeEnabled(switch_type)
+    end
+
     def locate_region(table_name, row_key)
       locator = @connection.getRegionLocator(TableName.valueOf(table_name))
       begin

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-shell/src/main/ruby/shell.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell.rb b/hbase-shell/src/main/ruby/shell.rb
index 0ecd3d7..4144b91 100644
--- a/hbase-shell/src/main/ruby/shell.rb
+++ b/hbase-shell/src/main/ruby/shell.rb
@@ -333,6 +333,8 @@ Shell.load_command_group(
     catalogjanitor_enabled
     compact_rs
     trace
+    splitormerge_switch
+    splitormerge_enabled
   ],
   # TODO remove older hlog_roll command
   :aliases => {

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-shell/src/main/ruby/shell/commands/splitormerge_enabled.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell/commands/splitormerge_enabled.rb b/hbase-shell/src/main/ruby/shell/commands/splitormerge_enabled.rb
new file mode 100644
index 0000000..7da7564
--- /dev/null
+++ b/hbase-shell/src/main/ruby/shell/commands/splitormerge_enabled.rb
@@ -0,0 +1,41 @@
+#!/usr/bin/env hbase-jruby
+#
+# 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.
+
+# Prints the current split or merge status
+module Shell
+  module Commands
+    # Command for check split or merge switch status
+    class SplitormergeEnabled < Command
+      def help
+        print <<-EOF
+Query the switch's state. You can set switch type, 'SPLIT' or 'MERGE'
+Examples:
+
+  hbase> splitormerge_enabled 'SPLIT'
+EOF
+      end
+
+      def command(switch_type)
+        format_simple_command do
+          formatter.row(
+            [admin.splitormerge_enabled(switch_type) ? 'true' : 'false']
+          )
+        end
+      end
+    end
+  end
+end

http://git-wip-us.apache.org/repos/asf/hbase/blob/24d481c5/hbase-shell/src/main/ruby/shell/commands/splitormerge_switch.rb
----------------------------------------------------------------------
diff --git a/hbase-shell/src/main/ruby/shell/commands/splitormerge_switch.rb b/hbase-shell/src/main/ruby/shell/commands/splitormerge_switch.rb
new file mode 100644
index 0000000..f4c2858
--- /dev/null
+++ b/hbase-shell/src/main/ruby/shell/commands/splitormerge_switch.rb
@@ -0,0 +1,43 @@
+#
+#
+# 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.
+#
+
+module Shell
+  module Commands
+    # Command for set switch for split and merge
+    class SplitormergeSwitch < Command
+      def help
+        print <<-EOF
+Enable/Disable one switch. You can set switch type 'SPLIT' or 'MERGE'. Returns previous split state.
+Examples:
+
+  hbase> splitormerge_switch 'SPLIT', true
+  hbase> splitormerge_switch 'SPLIT', false
+EOF
+      end
+
+      def command(switch_type, enabled)
+        format_simple_command do
+          formatter.row(
+            [admin.splitormerge_switch(switch_type, enabled) ? 'true' : 'false']
+          )
+        end
+      end
+    end
+  end
+end