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From st...@apache.org
Subject [21/26] hbase git commit: HBASE-14614 Procedure v2 - Core Assignment Manager (Matteo Bertozzi) Move to a new AssignmentManager, one that describes Assignment using a State Machine built on top of ProcedureV2 facility.
Date Wed, 31 May 2017 05:33:34 GMT
http://git-wip-us.apache.org/repos/asf/hbase/blob/fc144d45/hbase-protocol-shaded/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/generated/MasterProtos.java
----------------------------------------------------------------------
diff --git a/hbase-protocol-shaded/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/generated/MasterProtos.java b/hbase-protocol-shaded/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/generated/MasterProtos.java
index 798932e..5ea2044 100644
--- a/hbase-protocol-shaded/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/generated/MasterProtos.java
+++ b/hbase-protocol-shaded/src/main/java/org/apache/hadoop/hbase/shaded/protobuf/generated/MasterProtos.java
@@ -842,7 +842,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.TableName table_name = 1;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder> 
           getTableNameFieldBuilder() {
         if (tableNameBuilder_ == null) {
           tableNameBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -960,7 +960,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.ColumnFamilySchema column_families = 2;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchemaOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchemaOrBuilder> 
           getColumnFamiliesFieldBuilder() {
         if (columnFamiliesBuilder_ == null) {
           columnFamiliesBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -2257,7 +2257,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.TableName table_name = 1;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder> 
           getTableNameFieldBuilder() {
         if (tableNameBuilder_ == null) {
           tableNameBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -3622,7 +3622,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.TableName table_name = 1;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.TableNameOrBuilder> 
           getTableNameFieldBuilder() {
         if (tableNameBuilder_ == null) {
           tableNameBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -3740,7 +3740,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.ColumnFamilySchema column_families = 2;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchemaOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchema.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ColumnFamilySchemaOrBuilder> 
           getColumnFamiliesFieldBuilder() {
         if (columnFamiliesBuilder_ == null) {
           columnFamiliesBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -4955,7 +4955,7 @@ public final class MasterProtos {
        * <code>required .hbase.pb.RegionSpecifier region = 1;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> 
           getRegionFieldBuilder() {
         if (regionBuilder_ == null) {
           regionBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -5073,7 +5073,7 @@ public final class MasterProtos {
        * <code>optional .hbase.pb.ServerName dest_server_name = 2;</code>
        */
       private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerNameOrBuilder>
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerName, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerName.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.ServerNameOrBuilder> 
           getDestServerNameFieldBuilder() {
         if (destServerNameBuilder_ == null) {
           destServerNameBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
@@ -5507,33 +5507,35 @@ public final class MasterProtos {
 
   }
 
-  public interface MergeTableRegionsRequestOrBuilder extends
-      // @@protoc_insertion_point(interface_extends:hbase.pb.MergeTableRegionsRequest)
+  public interface DispatchMergingRegionsRequestOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:hbase.pb.DispatchMergingRegionsRequest)
       org.apache.hadoop.hbase.shaded.com.google.protobuf.MessageOrBuilder {
 
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier>
-        getRegionList();
+    boolean hasRegionA();
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegion(int index);
+    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionA();
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    int getRegionCount();
+    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionAOrBuilder();
+
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
      */
-    java.util.List<? extends org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>
-        getRegionOrBuilderList();
+    boolean hasRegionB();
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
      */
-    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionOrBuilder(
-        int index);
+    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionB();
+    /**
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
+     */
+    org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionBOrBuilder();
 
     /**
      * <code>optional bool forcible = 3 [default = false];</code>
@@ -5565,21 +5567,20 @@ public final class MasterProtos {
   /**
    * <pre>
    **
-   * Merging the specified regions in a table.
+   * Dispatch merging the specified regions.
    * </pre>
    *
-   * Protobuf type {@code hbase.pb.MergeTableRegionsRequest}
+   * Protobuf type {@code hbase.pb.DispatchMergingRegionsRequest}
    */
-  public  static final class MergeTableRegionsRequest extends
+  public  static final class DispatchMergingRegionsRequest extends
       org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3 implements
-      // @@protoc_insertion_point(message_implements:hbase.pb.MergeTableRegionsRequest)
-      MergeTableRegionsRequestOrBuilder {
-    // Use MergeTableRegionsRequest.newBuilder() to construct.
-    private MergeTableRegionsRequest(org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      // @@protoc_insertion_point(message_implements:hbase.pb.DispatchMergingRegionsRequest)
+      DispatchMergingRegionsRequestOrBuilder {
+    // Use DispatchMergingRegionsRequest.newBuilder() to construct.
+    private DispatchMergingRegionsRequest(org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
       super(builder);
     }
-    private MergeTableRegionsRequest() {
-      region_ = java.util.Collections.emptyList();
+    private DispatchMergingRegionsRequest() {
       forcible_ = false;
       nonceGroup_ = 0L;
       nonce_ = 0L;
@@ -5590,7 +5591,7 @@ public final class MasterProtos {
     getUnknownFields() {
       return this.unknownFields;
     }
-    private MergeTableRegionsRequest(
+    private DispatchMergingRegionsRequest(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
@@ -5614,26 +5615,43 @@ public final class MasterProtos {
               break;
             }
             case 10: {
-              if (!((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
-                region_ = new java.util.ArrayList<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier>();
-                mutable_bitField0_ |= 0x00000001;
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder subBuilder = null;
+              if (((bitField0_ & 0x00000001) == 0x00000001)) {
+                subBuilder = regionA_.toBuilder();
               }
-              region_.add(
-                  input.readMessage(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.PARSER, extensionRegistry));
+              regionA_ = input.readMessage(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.PARSER, extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom(regionA_);
+                regionA_ = subBuilder.buildPartial();
+              }
+              bitField0_ |= 0x00000001;
+              break;
+            }
+            case 18: {
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder subBuilder = null;
+              if (((bitField0_ & 0x00000002) == 0x00000002)) {
+                subBuilder = regionB_.toBuilder();
+              }
+              regionB_ = input.readMessage(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.PARSER, extensionRegistry);
+              if (subBuilder != null) {
+                subBuilder.mergeFrom(regionB_);
+                regionB_ = subBuilder.buildPartial();
+              }
+              bitField0_ |= 0x00000002;
               break;
             }
             case 24: {
-              bitField0_ |= 0x00000001;
+              bitField0_ |= 0x00000004;
               forcible_ = input.readBool();
               break;
             }
             case 32: {
-              bitField0_ |= 0x00000002;
+              bitField0_ |= 0x00000008;
               nonceGroup_ = input.readUInt64();
               break;
             }
             case 40: {
-              bitField0_ |= 0x00000004;
+              bitField0_ |= 0x00000010;
               nonce_ = input.readUInt64();
               break;
             }
@@ -5645,59 +5663,63 @@ public final class MasterProtos {
         throw new org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException(
             e).setUnfinishedMessage(this);
       } finally {
-        if (((mutable_bitField0_ & 0x00000001) == 0x00000001)) {
-          region_ = java.util.Collections.unmodifiableList(region_);
-        }
         this.unknownFields = unknownFields.build();
         makeExtensionsImmutable();
       }
     }
     public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
         getDescriptor() {
-      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsRequest_descriptor;
+      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsRequest_descriptor;
     }
 
     protected org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
         internalGetFieldAccessorTable() {
-      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsRequest_fieldAccessorTable
+      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsRequest_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
-              org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.Builder.class);
+              org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.Builder.class);
     }
 
     private int bitField0_;
-    public static final int REGION_FIELD_NUMBER = 1;
-    private java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier> region_;
+    public static final int REGION_A_FIELD_NUMBER = 1;
+    private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier regionA_;
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    public java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier> getRegionList() {
-      return region_;
+    public boolean hasRegionA() {
+      return ((bitField0_ & 0x00000001) == 0x00000001);
     }
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    public java.util.List<? extends org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>
-        getRegionOrBuilderList() {
-      return region_;
+    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionA() {
+      return regionA_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionA_;
     }
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
      */
-    public int getRegionCount() {
-      return region_.size();
+    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionAOrBuilder() {
+      return regionA_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionA_;
     }
+
+    public static final int REGION_B_FIELD_NUMBER = 2;
+    private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier regionB_;
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
      */
-    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegion(int index) {
-      return region_.get(index);
+    public boolean hasRegionB() {
+      return ((bitField0_ & 0x00000002) == 0x00000002);
     }
     /**
-     * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
      */
-    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionOrBuilder(
-        int index) {
-      return region_.get(index);
+    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionB() {
+      return regionB_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionB_;
+    }
+    /**
+     * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
+     */
+    public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionBOrBuilder() {
+      return regionB_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionB_;
     }
 
     public static final int FORCIBLE_FIELD_NUMBER = 3;
@@ -5706,7 +5728,7 @@ public final class MasterProtos {
      * <code>optional bool forcible = 3 [default = false];</code>
      */
     public boolean hasForcible() {
-      return ((bitField0_ & 0x00000001) == 0x00000001);
+      return ((bitField0_ & 0x00000004) == 0x00000004);
     }
     /**
      * <code>optional bool forcible = 3 [default = false];</code>
@@ -5721,7 +5743,7 @@ public final class MasterProtos {
      * <code>optional uint64 nonce_group = 4 [default = 0];</code>
      */
     public boolean hasNonceGroup() {
-      return ((bitField0_ & 0x00000002) == 0x00000002);
+      return ((bitField0_ & 0x00000008) == 0x00000008);
     }
     /**
      * <code>optional uint64 nonce_group = 4 [default = 0];</code>
@@ -5736,7 +5758,7 @@ public final class MasterProtos {
      * <code>optional uint64 nonce = 5 [default = 0];</code>
      */
     public boolean hasNonce() {
-      return ((bitField0_ & 0x00000004) == 0x00000004);
+      return ((bitField0_ & 0x00000010) == 0x00000010);
     }
     /**
      * <code>optional uint64 nonce = 5 [default = 0];</code>
@@ -5751,11 +5773,21 @@ public final class MasterProtos {
       if (isInitialized == 1) return true;
       if (isInitialized == 0) return false;
 
-      for (int i = 0; i < getRegionCount(); i++) {
-        if (!getRegion(i).isInitialized()) {
-          memoizedIsInitialized = 0;
-          return false;
-        }
+      if (!hasRegionA()) {
+        memoizedIsInitialized = 0;
+        return false;
+      }
+      if (!hasRegionB()) {
+        memoizedIsInitialized = 0;
+        return false;
+      }
+      if (!getRegionA().isInitialized()) {
+        memoizedIsInitialized = 0;
+        return false;
+      }
+      if (!getRegionB().isInitialized()) {
+        memoizedIsInitialized = 0;
+        return false;
       }
       memoizedIsInitialized = 1;
       return true;
@@ -5763,16 +5795,19 @@ public final class MasterProtos {
 
     public void writeTo(org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      for (int i = 0; i < region_.size(); i++) {
-        output.writeMessage(1, region_.get(i));
-      }
       if (((bitField0_ & 0x00000001) == 0x00000001)) {
-        output.writeBool(3, forcible_);
+        output.writeMessage(1, getRegionA());
       }
       if (((bitField0_ & 0x00000002) == 0x00000002)) {
-        output.writeUInt64(4, nonceGroup_);
+        output.writeMessage(2, getRegionB());
       }
       if (((bitField0_ & 0x00000004) == 0x00000004)) {
+        output.writeBool(3, forcible_);
+      }
+      if (((bitField0_ & 0x00000008) == 0x00000008)) {
+        output.writeUInt64(4, nonceGroup_);
+      }
+      if (((bitField0_ & 0x00000010) == 0x00000010)) {
         output.writeUInt64(5, nonce_);
       }
       unknownFields.writeTo(output);
@@ -5783,19 +5818,23 @@ public final class MasterProtos {
       if (size != -1) return size;
 
       size = 0;
-      for (int i = 0; i < region_.size(); i++) {
+      if (((bitField0_ & 0x00000001) == 0x00000001)) {
         size += org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream
-          .computeMessageSize(1, region_.get(i));
+          .computeMessageSize(1, getRegionA());
       }
-      if (((bitField0_ & 0x00000001) == 0x00000001)) {
+      if (((bitField0_ & 0x00000002) == 0x00000002)) {
+        size += org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream
+          .computeMessageSize(2, getRegionB());
+      }
+      if (((bitField0_ & 0x00000004) == 0x00000004)) {
         size += org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream
           .computeBoolSize(3, forcible_);
       }
-      if (((bitField0_ & 0x00000002) == 0x00000002)) {
+      if (((bitField0_ & 0x00000008) == 0x00000008)) {
         size += org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream
           .computeUInt64Size(4, nonceGroup_);
       }
-      if (((bitField0_ & 0x00000004) == 0x00000004)) {
+      if (((bitField0_ & 0x00000010) == 0x00000010)) {
         size += org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedOutputStream
           .computeUInt64Size(5, nonce_);
       }
@@ -5810,14 +5849,22 @@ public final class MasterProtos {
       if (obj == this) {
        return true;
       }
-      if (!(obj instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest)) {
+      if (!(obj instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest)) {
         return super.equals(obj);
       }
-      org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest other = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest) obj;
+      org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest other = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest) obj;
 
       boolean result = true;
-      result = result && getRegionList()
-          .equals(other.getRegionList());
+      result = result && (hasRegionA() == other.hasRegionA());
+      if (hasRegionA()) {
+        result = result && getRegionA()
+            .equals(other.getRegionA());
+      }
+      result = result && (hasRegionB() == other.hasRegionB());
+      if (hasRegionB()) {
+        result = result && getRegionB()
+            .equals(other.getRegionB());
+      }
       result = result && (hasForcible() == other.hasForcible());
       if (hasForcible()) {
         result = result && (getForcible()
@@ -5844,9 +5891,13 @@ public final class MasterProtos {
       }
       int hash = 41;
       hash = (19 * hash) + getDescriptor().hashCode();
-      if (getRegionCount() > 0) {
-        hash = (37 * hash) + REGION_FIELD_NUMBER;
-        hash = (53 * hash) + getRegionList().hashCode();
+      if (hasRegionA()) {
+        hash = (37 * hash) + REGION_A_FIELD_NUMBER;
+        hash = (53 * hash) + getRegionA().hashCode();
+      }
+      if (hasRegionB()) {
+        hash = (37 * hash) + REGION_B_FIELD_NUMBER;
+        hash = (53 * hash) + getRegionB().hashCode();
       }
       if (hasForcible()) {
         hash = (37 * hash) + FORCIBLE_FIELD_NUMBER;
@@ -5868,58 +5919,58 @@ public final class MasterProtos {
       return hash;
     }
 
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ByteString data)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ByteString data,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(byte[] data)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(byte[] data)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         byte[] data,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(java.io.InputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         java.io.InputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseDelimitedFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseDelimitedFrom(java.io.InputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseDelimitedFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseDelimitedFrom(
         java.io.InputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
@@ -5931,7 +5982,7 @@ public final class MasterProtos {
     public static Builder newBuilder() {
       return DEFAULT_INSTANCE.toBuilder();
     }
-    public static Builder newBuilder(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest prototype) {
+    public static Builder newBuilder(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest prototype) {
       return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
     }
     public Builder toBuilder() {
@@ -5948,28 +5999,28 @@ public final class MasterProtos {
     /**
      * <pre>
      **
-     * Merging the specified regions in a table.
+     * Dispatch merging the specified regions.
      * </pre>
      *
-     * Protobuf type {@code hbase.pb.MergeTableRegionsRequest}
+     * Protobuf type {@code hbase.pb.DispatchMergingRegionsRequest}
      */
     public static final class Builder extends
         org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
-        // @@protoc_insertion_point(builder_implements:hbase.pb.MergeTableRegionsRequest)
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequestOrBuilder {
+        // @@protoc_insertion_point(builder_implements:hbase.pb.DispatchMergingRegionsRequest)
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequestOrBuilder {
       public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
           getDescriptor() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsRequest_descriptor;
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsRequest_descriptor;
       }
 
       protected org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
           internalGetFieldAccessorTable() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsRequest_fieldAccessorTable
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsRequest_fieldAccessorTable
             .ensureFieldAccessorsInitialized(
-                org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.Builder.class);
+                org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.Builder.class);
       }
 
-      // Construct using org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.newBuilder()
+      // Construct using org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.newBuilder()
       private Builder() {
         maybeForceBuilderInitialization();
       }
@@ -5982,66 +6033,80 @@ public final class MasterProtos {
       private void maybeForceBuilderInitialization() {
         if (org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
                 .alwaysUseFieldBuilders) {
-          getRegionFieldBuilder();
+          getRegionAFieldBuilder();
+          getRegionBFieldBuilder();
         }
       }
       public Builder clear() {
         super.clear();
-        if (regionBuilder_ == null) {
-          region_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000001);
+        if (regionABuilder_ == null) {
+          regionA_ = null;
         } else {
-          regionBuilder_.clear();
+          regionABuilder_.clear();
+        }
+        bitField0_ = (bitField0_ & ~0x00000001);
+        if (regionBBuilder_ == null) {
+          regionB_ = null;
+        } else {
+          regionBBuilder_.clear();
         }
-        forcible_ = false;
         bitField0_ = (bitField0_ & ~0x00000002);
-        nonceGroup_ = 0L;
+        forcible_ = false;
         bitField0_ = (bitField0_ & ~0x00000004);
-        nonce_ = 0L;
+        nonceGroup_ = 0L;
         bitField0_ = (bitField0_ & ~0x00000008);
+        nonce_ = 0L;
+        bitField0_ = (bitField0_ & ~0x00000010);
         return this;
       }
 
       public org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
           getDescriptorForType() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsRequest_descriptor;
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsRequest_descriptor;
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest getDefaultInstanceForType() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.getDefaultInstance();
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.getDefaultInstance();
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest build() {
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest result = buildPartial();
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest build() {
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest result = buildPartial();
         if (!result.isInitialized()) {
           throw newUninitializedMessageException(result);
         }
         return result;
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest buildPartial() {
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest result = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest(this);
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest buildPartial() {
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest result = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest(this);
         int from_bitField0_ = bitField0_;
         int to_bitField0_ = 0;
-        if (regionBuilder_ == null) {
-          if (((bitField0_ & 0x00000001) == 0x00000001)) {
-            region_ = java.util.Collections.unmodifiableList(region_);
-            bitField0_ = (bitField0_ & ~0x00000001);
-          }
-          result.region_ = region_;
+        if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
+          to_bitField0_ |= 0x00000001;
+        }
+        if (regionABuilder_ == null) {
+          result.regionA_ = regionA_;
         } else {
-          result.region_ = regionBuilder_.build();
+          result.regionA_ = regionABuilder_.build();
         }
         if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
-          to_bitField0_ |= 0x00000001;
+          to_bitField0_ |= 0x00000002;
+        }
+        if (regionBBuilder_ == null) {
+          result.regionB_ = regionB_;
+        } else {
+          result.regionB_ = regionBBuilder_.build();
         }
-        result.forcible_ = forcible_;
         if (((from_bitField0_ & 0x00000004) == 0x00000004)) {
-          to_bitField0_ |= 0x00000002;
+          to_bitField0_ |= 0x00000004;
         }
-        result.nonceGroup_ = nonceGroup_;
+        result.forcible_ = forcible_;
         if (((from_bitField0_ & 0x00000008) == 0x00000008)) {
-          to_bitField0_ |= 0x00000004;
+          to_bitField0_ |= 0x00000008;
+        }
+        result.nonceGroup_ = nonceGroup_;
+        if (((from_bitField0_ & 0x00000010) == 0x00000010)) {
+          to_bitField0_ |= 0x00000010;
         }
         result.nonce_ = nonce_;
         result.bitField0_ = to_bitField0_;
@@ -6076,41 +6141,21 @@ public final class MasterProtos {
         return (Builder) super.addRepeatedField(field, value);
       }
       public Builder mergeFrom(org.apache.hadoop.hbase.shaded.com.google.protobuf.Message other) {
-        if (other instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest) {
-          return mergeFrom((org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest)other);
+        if (other instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest) {
+          return mergeFrom((org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest)other);
         } else {
           super.mergeFrom(other);
           return this;
         }
       }
 
-      public Builder mergeFrom(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest other) {
-        if (other == org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest.getDefaultInstance()) return this;
-        if (regionBuilder_ == null) {
-          if (!other.region_.isEmpty()) {
-            if (region_.isEmpty()) {
-              region_ = other.region_;
-              bitField0_ = (bitField0_ & ~0x00000001);
-            } else {
-              ensureRegionIsMutable();
-              region_.addAll(other.region_);
-            }
-            onChanged();
-          }
-        } else {
-          if (!other.region_.isEmpty()) {
-            if (regionBuilder_.isEmpty()) {
-              regionBuilder_.dispose();
-              regionBuilder_ = null;
-              region_ = other.region_;
-              bitField0_ = (bitField0_ & ~0x00000001);
-              regionBuilder_ =
-                org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders ?
-                   getRegionFieldBuilder() : null;
-            } else {
-              regionBuilder_.addAllMessages(other.region_);
-            }
-          }
+      public Builder mergeFrom(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest other) {
+        if (other == org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest.getDefaultInstance()) return this;
+        if (other.hasRegionA()) {
+          mergeRegionA(other.getRegionA());
+        }
+        if (other.hasRegionB()) {
+          mergeRegionB(other.getRegionB());
         }
         if (other.hasForcible()) {
           setForcible(other.getForcible());
@@ -6127,10 +6172,17 @@ public final class MasterProtos {
       }
 
       public final boolean isInitialized() {
-        for (int i = 0; i < getRegionCount(); i++) {
-          if (!getRegion(i).isInitialized()) {
-            return false;
-          }
+        if (!hasRegionA()) {
+          return false;
+        }
+        if (!hasRegionB()) {
+          return false;
+        }
+        if (!getRegionA().isInitialized()) {
+          return false;
+        }
+        if (!getRegionB().isInitialized()) {
+          return false;
         }
         return true;
       }
@@ -6139,11 +6191,11 @@ public final class MasterProtos {
           org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
           org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws java.io.IOException {
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest parsedMessage = null;
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest parsedMessage = null;
         try {
           parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
         } catch (org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException e) {
-          parsedMessage = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest) e.getUnfinishedMessage();
+          parsedMessage = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest) e.getUnfinishedMessage();
           throw e.unwrapIOException();
         } finally {
           if (parsedMessage != null) {
@@ -6154,244 +6206,240 @@ public final class MasterProtos {
       }
       private int bitField0_;
 
-      private java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier> region_ =
-        java.util.Collections.emptyList();
-      private void ensureRegionIsMutable() {
-        if (!((bitField0_ & 0x00000001) == 0x00000001)) {
-          region_ = new java.util.ArrayList<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier>(region_);
-          bitField0_ |= 0x00000001;
-         }
-      }
-
-      private org.apache.hadoop.hbase.shaded.com.google.protobuf.RepeatedFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> regionBuilder_;
-
-      /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
-       */
-      public java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier> getRegionList() {
-        if (regionBuilder_ == null) {
-          return java.util.Collections.unmodifiableList(region_);
-        } else {
-          return regionBuilder_.getMessageList();
-        }
-      }
+      private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier regionA_ = null;
+      private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> regionABuilder_;
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public int getRegionCount() {
-        if (regionBuilder_ == null) {
-          return region_.size();
-        } else {
-          return regionBuilder_.getCount();
-        }
+      public boolean hasRegionA() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegion(int index) {
-        if (regionBuilder_ == null) {
-          return region_.get(index);
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionA() {
+        if (regionABuilder_ == null) {
+          return regionA_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionA_;
         } else {
-          return regionBuilder_.getMessage(index);
+          return regionABuilder_.getMessage();
         }
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder setRegion(
-          int index, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
-        if (regionBuilder_ == null) {
+      public Builder setRegionA(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
+        if (regionABuilder_ == null) {
           if (value == null) {
             throw new NullPointerException();
           }
-          ensureRegionIsMutable();
-          region_.set(index, value);
+          regionA_ = value;
           onChanged();
         } else {
-          regionBuilder_.setMessage(index, value);
+          regionABuilder_.setMessage(value);
         }
+        bitField0_ |= 0x00000001;
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder setRegion(
-          int index, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder builderForValue) {
-        if (regionBuilder_ == null) {
-          ensureRegionIsMutable();
-          region_.set(index, builderForValue.build());
+      public Builder setRegionA(
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder builderForValue) {
+        if (regionABuilder_ == null) {
+          regionA_ = builderForValue.build();
           onChanged();
         } else {
-          regionBuilder_.setMessage(index, builderForValue.build());
+          regionABuilder_.setMessage(builderForValue.build());
         }
+        bitField0_ |= 0x00000001;
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder addRegion(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
-        if (regionBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
+      public Builder mergeRegionA(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
+        if (regionABuilder_ == null) {
+          if (((bitField0_ & 0x00000001) == 0x00000001) &&
+              regionA_ != null &&
+              regionA_ != org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance()) {
+            regionA_ =
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.newBuilder(regionA_).mergeFrom(value).buildPartial();
+          } else {
+            regionA_ = value;
           }
-          ensureRegionIsMutable();
-          region_.add(value);
           onChanged();
         } else {
-          regionBuilder_.addMessage(value);
+          regionABuilder_.mergeFrom(value);
         }
+        bitField0_ |= 0x00000001;
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder addRegion(
-          int index, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
-        if (regionBuilder_ == null) {
-          if (value == null) {
-            throw new NullPointerException();
-          }
-          ensureRegionIsMutable();
-          region_.add(index, value);
+      public Builder clearRegionA() {
+        if (regionABuilder_ == null) {
+          regionA_ = null;
           onChanged();
         } else {
-          regionBuilder_.addMessage(index, value);
+          regionABuilder_.clear();
         }
+        bitField0_ = (bitField0_ & ~0x00000001);
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder addRegion(
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder builderForValue) {
-        if (regionBuilder_ == null) {
-          ensureRegionIsMutable();
-          region_.add(builderForValue.build());
-          onChanged();
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder getRegionABuilder() {
+        bitField0_ |= 0x00000001;
+        onChanged();
+        return getRegionAFieldBuilder().getBuilder();
+      }
+      /**
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
+       */
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionAOrBuilder() {
+        if (regionABuilder_ != null) {
+          return regionABuilder_.getMessageOrBuilder();
         } else {
-          regionBuilder_.addMessage(builderForValue.build());
+          return regionA_ == null ?
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionA_;
         }
-        return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_a = 1;</code>
        */
-      public Builder addRegion(
-          int index, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder builderForValue) {
-        if (regionBuilder_ == null) {
-          ensureRegionIsMutable();
-          region_.add(index, builderForValue.build());
-          onChanged();
-        } else {
-          regionBuilder_.addMessage(index, builderForValue.build());
+      private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> 
+          getRegionAFieldBuilder() {
+        if (regionABuilder_ == null) {
+          regionABuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>(
+                  getRegionA(),
+                  getParentForChildren(),
+                  isClean());
+          regionA_ = null;
         }
-        return this;
+        return regionABuilder_;
       }
+
+      private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier regionB_ = null;
+      private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> regionBBuilder_;
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public Builder addAllRegion(
-          java.lang.Iterable<? extends org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier> values) {
-        if (regionBuilder_ == null) {
-          ensureRegionIsMutable();
-          org.apache.hadoop.hbase.shaded.com.google.protobuf.AbstractMessageLite.Builder.addAll(
-              values, region_);
-          onChanged();
+      public boolean hasRegionB() {
+        return ((bitField0_ & 0x00000002) == 0x00000002);
+      }
+      /**
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
+       */
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier getRegionB() {
+        if (regionBBuilder_ == null) {
+          return regionB_ == null ? org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionB_;
         } else {
-          regionBuilder_.addAllMessages(values);
+          return regionBBuilder_.getMessage();
         }
-        return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public Builder clearRegion() {
-        if (regionBuilder_ == null) {
-          region_ = java.util.Collections.emptyList();
-          bitField0_ = (bitField0_ & ~0x00000001);
+      public Builder setRegionB(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
+        if (regionBBuilder_ == null) {
+          if (value == null) {
+            throw new NullPointerException();
+          }
+          regionB_ = value;
           onChanged();
         } else {
-          regionBuilder_.clear();
+          regionBBuilder_.setMessage(value);
         }
+        bitField0_ |= 0x00000002;
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public Builder removeRegion(int index) {
-        if (regionBuilder_ == null) {
-          ensureRegionIsMutable();
-          region_.remove(index);
+      public Builder setRegionB(
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder builderForValue) {
+        if (regionBBuilder_ == null) {
+          regionB_ = builderForValue.build();
           onChanged();
         } else {
-          regionBuilder_.remove(index);
+          regionBBuilder_.setMessage(builderForValue.build());
         }
+        bitField0_ |= 0x00000002;
         return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
-       */
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder getRegionBuilder(
-          int index) {
-        return getRegionFieldBuilder().getBuilder(index);
-      }
-      /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionOrBuilder(
-          int index) {
-        if (regionBuilder_ == null) {
-          return region_.get(index);  } else {
-          return regionBuilder_.getMessageOrBuilder(index);
+      public Builder mergeRegionB(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier value) {
+        if (regionBBuilder_ == null) {
+          if (((bitField0_ & 0x00000002) == 0x00000002) &&
+              regionB_ != null &&
+              regionB_ != org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance()) {
+            regionB_ =
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.newBuilder(regionB_).mergeFrom(value).buildPartial();
+          } else {
+            regionB_ = value;
+          }
+          onChanged();
+        } else {
+          regionBBuilder_.mergeFrom(value);
         }
+        bitField0_ |= 0x00000002;
+        return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public java.util.List<? extends org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>
-           getRegionOrBuilderList() {
-        if (regionBuilder_ != null) {
-          return regionBuilder_.getMessageOrBuilderList();
+      public Builder clearRegionB() {
+        if (regionBBuilder_ == null) {
+          regionB_ = null;
+          onChanged();
         } else {
-          return java.util.Collections.unmodifiableList(region_);
+          regionBBuilder_.clear();
         }
+        bitField0_ = (bitField0_ & ~0x00000002);
+        return this;
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder addRegionBuilder() {
-        return getRegionFieldBuilder().addBuilder(
-            org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance());
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder getRegionBBuilder() {
+        bitField0_ |= 0x00000002;
+        onChanged();
+        return getRegionBFieldBuilder().getBuilder();
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder addRegionBuilder(
-          int index) {
-        return getRegionFieldBuilder().addBuilder(
-            index, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance());
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder getRegionBOrBuilder() {
+        if (regionBBuilder_ != null) {
+          return regionBBuilder_.getMessageOrBuilder();
+        } else {
+          return regionB_ == null ?
+              org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.getDefaultInstance() : regionB_;
+        }
       }
       /**
-       * <code>repeated .hbase.pb.RegionSpecifier region = 1;</code>
+       * <code>required .hbase.pb.RegionSpecifier region_b = 2;</code>
        */
-      public java.util.List<org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder>
-           getRegionBuilderList() {
-        return getRegionFieldBuilder().getBuilderList();
-      }
-      private org.apache.hadoop.hbase.shaded.com.google.protobuf.RepeatedFieldBuilderV3<
-          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>
-          getRegionFieldBuilder() {
-        if (regionBuilder_ == null) {
-          regionBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.RepeatedFieldBuilderV3<
+      private org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
+          org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder> 
+          getRegionBFieldBuilder() {
+        if (regionBBuilder_ == null) {
+          regionBBuilder_ = new org.apache.hadoop.hbase.shaded.com.google.protobuf.SingleFieldBuilderV3<
               org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifier.Builder, org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RegionSpecifierOrBuilder>(
-                  region_,
-                  ((bitField0_ & 0x00000001) == 0x00000001),
+                  getRegionB(),
                   getParentForChildren(),
                   isClean());
-          region_ = null;
+          regionB_ = null;
         }
-        return regionBuilder_;
+        return regionBBuilder_;
       }
 
       private boolean forcible_ ;
@@ -6399,7 +6447,7 @@ public final class MasterProtos {
        * <code>optional bool forcible = 3 [default = false];</code>
        */
       public boolean hasForcible() {
-        return ((bitField0_ & 0x00000002) == 0x00000002);
+        return ((bitField0_ & 0x00000004) == 0x00000004);
       }
       /**
        * <code>optional bool forcible = 3 [default = false];</code>
@@ -6411,7 +6459,7 @@ public final class MasterProtos {
        * <code>optional bool forcible = 3 [default = false];</code>
        */
       public Builder setForcible(boolean value) {
-        bitField0_ |= 0x00000002;
+        bitField0_ |= 0x00000004;
         forcible_ = value;
         onChanged();
         return this;
@@ -6420,7 +6468,7 @@ public final class MasterProtos {
        * <code>optional bool forcible = 3 [default = false];</code>
        */
       public Builder clearForcible() {
-        bitField0_ = (bitField0_ & ~0x00000002);
+        bitField0_ = (bitField0_ & ~0x00000004);
         forcible_ = false;
         onChanged();
         return this;
@@ -6431,7 +6479,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce_group = 4 [default = 0];</code>
        */
       public boolean hasNonceGroup() {
-        return ((bitField0_ & 0x00000004) == 0x00000004);
+        return ((bitField0_ & 0x00000008) == 0x00000008);
       }
       /**
        * <code>optional uint64 nonce_group = 4 [default = 0];</code>
@@ -6443,7 +6491,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce_group = 4 [default = 0];</code>
        */
       public Builder setNonceGroup(long value) {
-        bitField0_ |= 0x00000004;
+        bitField0_ |= 0x00000008;
         nonceGroup_ = value;
         onChanged();
         return this;
@@ -6452,7 +6500,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce_group = 4 [default = 0];</code>
        */
       public Builder clearNonceGroup() {
-        bitField0_ = (bitField0_ & ~0x00000004);
+        bitField0_ = (bitField0_ & ~0x00000008);
         nonceGroup_ = 0L;
         onChanged();
         return this;
@@ -6463,7 +6511,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce = 5 [default = 0];</code>
        */
       public boolean hasNonce() {
-        return ((bitField0_ & 0x00000008) == 0x00000008);
+        return ((bitField0_ & 0x00000010) == 0x00000010);
       }
       /**
        * <code>optional uint64 nonce = 5 [default = 0];</code>
@@ -6475,7 +6523,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce = 5 [default = 0];</code>
        */
       public Builder setNonce(long value) {
-        bitField0_ |= 0x00000008;
+        bitField0_ |= 0x00000010;
         nonce_ = value;
         onChanged();
         return this;
@@ -6484,7 +6532,7 @@ public final class MasterProtos {
        * <code>optional uint64 nonce = 5 [default = 0];</code>
        */
       public Builder clearNonce() {
-        bitField0_ = (bitField0_ & ~0x00000008);
+        bitField0_ = (bitField0_ & ~0x00000010);
         nonce_ = 0L;
         onChanged();
         return this;
@@ -6500,46 +6548,46 @@ public final class MasterProtos {
       }
 
 
-      // @@protoc_insertion_point(builder_scope:hbase.pb.MergeTableRegionsRequest)
+      // @@protoc_insertion_point(builder_scope:hbase.pb.DispatchMergingRegionsRequest)
     }
 
-    // @@protoc_insertion_point(class_scope:hbase.pb.MergeTableRegionsRequest)
-    private static final org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest DEFAULT_INSTANCE;
+    // @@protoc_insertion_point(class_scope:hbase.pb.DispatchMergingRegionsRequest)
+    private static final org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest DEFAULT_INSTANCE;
     static {
-      DEFAULT_INSTANCE = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest();
+      DEFAULT_INSTANCE = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest();
     }
 
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest getDefaultInstance() {
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest getDefaultInstance() {
       return DEFAULT_INSTANCE;
     }
 
-    @java.lang.Deprecated public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<MergeTableRegionsRequest>
-        PARSER = new org.apache.hadoop.hbase.shaded.com.google.protobuf.AbstractParser<MergeTableRegionsRequest>() {
-      public MergeTableRegionsRequest parsePartialFrom(
+    @java.lang.Deprecated public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<DispatchMergingRegionsRequest>
+        PARSER = new org.apache.hadoop.hbase.shaded.com.google.protobuf.AbstractParser<DispatchMergingRegionsRequest>() {
+      public DispatchMergingRegionsRequest parsePartialFrom(
           org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
           org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
           throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
-          return new MergeTableRegionsRequest(input, extensionRegistry);
+          return new DispatchMergingRegionsRequest(input, extensionRegistry);
       }
     };
 
-    public static org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<MergeTableRegionsRequest> parser() {
+    public static org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<DispatchMergingRegionsRequest> parser() {
       return PARSER;
     }
 
     @java.lang.Override
-    public org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<MergeTableRegionsRequest> getParserForType() {
+    public org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<DispatchMergingRegionsRequest> getParserForType() {
       return PARSER;
     }
 
-    public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsRequest getDefaultInstanceForType() {
+    public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsRequest getDefaultInstanceForType() {
       return DEFAULT_INSTANCE;
     }
 
   }
 
-  public interface MergeTableRegionsResponseOrBuilder extends
-      // @@protoc_insertion_point(interface_extends:hbase.pb.MergeTableRegionsResponse)
+  public interface DispatchMergingRegionsResponseOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:hbase.pb.DispatchMergingRegionsResponse)
       org.apache.hadoop.hbase.shaded.com.google.protobuf.MessageOrBuilder {
 
     /**
@@ -6552,17 +6600,17 @@ public final class MasterProtos {
     long getProcId();
   }
   /**
-   * Protobuf type {@code hbase.pb.MergeTableRegionsResponse}
+   * Protobuf type {@code hbase.pb.DispatchMergingRegionsResponse}
    */
-  public  static final class MergeTableRegionsResponse extends
+  public  static final class DispatchMergingRegionsResponse extends
       org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3 implements
-      // @@protoc_insertion_point(message_implements:hbase.pb.MergeTableRegionsResponse)
-      MergeTableRegionsResponseOrBuilder {
-    // Use MergeTableRegionsResponse.newBuilder() to construct.
-    private MergeTableRegionsResponse(org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
+      // @@protoc_insertion_point(message_implements:hbase.pb.DispatchMergingRegionsResponse)
+      DispatchMergingRegionsResponseOrBuilder {
+    // Use DispatchMergingRegionsResponse.newBuilder() to construct.
+    private DispatchMergingRegionsResponse(org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<?> builder) {
       super(builder);
     }
-    private MergeTableRegionsResponse() {
+    private DispatchMergingRegionsResponse() {
       procId_ = 0L;
     }
 
@@ -6571,7 +6619,7 @@ public final class MasterProtos {
     getUnknownFields() {
       return this.unknownFields;
     }
-    private MergeTableRegionsResponse(
+    private DispatchMergingRegionsResponse(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
@@ -6613,14 +6661,14 @@ public final class MasterProtos {
     }
     public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
         getDescriptor() {
-      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsResponse_descriptor;
+      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsResponse_descriptor;
     }
 
     protected org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
         internalGetFieldAccessorTable() {
-      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsResponse_fieldAccessorTable
+      return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsResponse_fieldAccessorTable
           .ensureFieldAccessorsInitialized(
-              org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.Builder.class);
+              org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.Builder.class);
     }
 
     private int bitField0_;
@@ -6677,10 +6725,10 @@ public final class MasterProtos {
       if (obj == this) {
        return true;
       }
-      if (!(obj instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse)) {
+      if (!(obj instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse)) {
         return super.equals(obj);
       }
-      org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse other = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse) obj;
+      org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse other = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse) obj;
 
       boolean result = true;
       result = result && (hasProcId() == other.hasProcId());
@@ -6709,58 +6757,58 @@ public final class MasterProtos {
       return hash;
     }
 
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ByteString data)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ByteString data,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(byte[] data)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(byte[] data)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         byte[] data,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
       return PARSER.parseFrom(data, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(java.io.InputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         java.io.InputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseDelimitedFrom(java.io.InputStream input)
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseDelimitedFrom(java.io.InputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseDelimitedFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseDelimitedFrom(
         java.io.InputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input)
         throws java.io.IOException {
       return org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3
           .parseWithIOException(PARSER, input);
     }
-    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse parseFrom(
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parseFrom(
         org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
         org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
         throws java.io.IOException {
@@ -6772,7 +6820,7 @@ public final class MasterProtos {
     public static Builder newBuilder() {
       return DEFAULT_INSTANCE.toBuilder();
     }
-    public static Builder newBuilder(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse prototype) {
+    public static Builder newBuilder(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse prototype) {
       return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
     }
     public Builder toBuilder() {
@@ -6787,25 +6835,25 @@ public final class MasterProtos {
       return builder;
     }
     /**
-     * Protobuf type {@code hbase.pb.MergeTableRegionsResponse}
+     * Protobuf type {@code hbase.pb.DispatchMergingRegionsResponse}
      */
     public static final class Builder extends
         org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
-        // @@protoc_insertion_point(builder_implements:hbase.pb.MergeTableRegionsResponse)
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponseOrBuilder {
+        // @@protoc_insertion_point(builder_implements:hbase.pb.DispatchMergingRegionsResponse)
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponseOrBuilder {
       public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
           getDescriptor() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsResponse_descriptor;
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsResponse_descriptor;
       }
 
       protected org.apache.hadoop.hbase.shaded.com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
           internalGetFieldAccessorTable() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsResponse_fieldAccessorTable
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsResponse_fieldAccessorTable
             .ensureFieldAccessorsInitialized(
-                org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.Builder.class);
+                org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.class, org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.Builder.class);
       }
 
-      // Construct using org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.newBuilder()
+      // Construct using org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.newBuilder()
       private Builder() {
         maybeForceBuilderInitialization();
       }
@@ -6829,23 +6877,23 @@ public final class MasterProtos {
 
       public org.apache.hadoop.hbase.shaded.com.google.protobuf.Descriptors.Descriptor
           getDescriptorForType() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_MergeTableRegionsResponse_descriptor;
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.internal_static_hbase_pb_DispatchMergingRegionsResponse_descriptor;
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse getDefaultInstanceForType() {
-        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse.getDefaultInstance();
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse getDefaultInstanceForType() {
+        return org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.getDefaultInstance();
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse build() {
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse result = buildPartial();
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse build() {
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse result = buildPartial();
         if (!result.isInitialized()) {
           throw newUninitializedMessageException(result);
         }
         return result;
       }
 
-      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse buildPartial() {
-        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse result = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse(this);
+      public org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse buildPartial() {
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse result = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse(this);
         int from_bitField0_ = bitField0_;
         int to_bitField0_ = 0;
         if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
@@ -6884,19 +6932,2515 @@ public final class MasterProtos {
         return (Builder) super.addRepeatedField(field, value);
       }
       public Builder mergeFrom(org.apache.hadoop.hbase.shaded.com.google.protobuf.Message other) {
-        if (other instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse) {
-          return mergeFrom((org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.MergeTableRegionsResponse)other);
+        if (other instanceof org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse) {
+          return mergeFrom((org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse other) {
+        if (other == org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse.getDefaultInstance()) return this;
+        if (other.hasProcId()) {
+          setProcId(other.getProcId());
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      public Builder mergeFrom(
+          org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
+          org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse) e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+      private int bitField0_;
+
+      private long procId_ ;
+      /**
+       * <code>optional uint64 proc_id = 1;</code>
+       */
+      public boolean hasProcId() {
+        return ((bitField0_ & 0x00000001) == 0x00000001);
+      }
+      /**
+       * <code>optional uint64 proc_id = 1;</code>
+       */
+      public long getProcId() {
+        return procId_;
+      }
+      /**
+       * <code>optional uint64 proc_id = 1;</code>
+       */
+      public Builder setProcId(long value) {
+        bitField0_ |= 0x00000001;
+        procId_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>optional uint64 proc_id = 1;</code>
+       */
+      public Builder clearProcId() {
+        bitField0_ = (bitField0_ & ~0x00000001);
+        procId_ = 0L;
+        onChanged();
+        return this;
+      }
+      public final Builder setUnknownFields(
+          final org.apache.hadoop.hbase.shaded.com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      public final Builder mergeUnknownFields(
+          final org.apache.hadoop.hbase.shaded.com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:hbase.pb.DispatchMergingRegionsResponse)
+    }
+
+    // @@protoc_insertion_point(class_scope:hbase.pb.DispatchMergingRegionsResponse)
+    private static final org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse();
+    }
+
+    public static org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos.DispatchMergingRegionsResponse getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    @java.lang.Deprecated public static final org.apache.hadoop.hbase.shaded.com.google.protobuf.Parser<DispatchMergingRegionsResponse>
+        PARSER = new org.apache.hadoop.hbase.shaded.com.google.protobuf.AbstractParser<DispatchMergingRegionsResponse>() {
+      public DispatchMergingRegionsResponse parsePartialFrom(
+          org.apache.hadoop.hbase.shaded.com.google.protobuf.CodedInputStream input,
+          org.apache.hadoop.hbase.shaded.com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws org.apache.hadoop.hbase.shaded.com.google.protobuf.InvalidProtocolBufferException {
+          return new DispatchMergingRegionsResponse(input, extensionRegistry);
+      }
+    };
+
+    public static org.apa

<TRUNCATED>

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