HBASE-18991 Removed RegionMergeRequest

Signed-off-by: Chia-Ping Tsai <chia7712@gmail.com>

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionMergeRequest.java

@@ -1,112 +0,0 @@
-/**
- * Copyright The Apache Software Foundation
- *
- * 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.regionserver;
-
-import java.security.PrivilegedAction;
-
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.TableName;
-import org.apache.hadoop.hbase.client.RegionInfo;
-import org.apache.hadoop.hbase.client.RegionInfoBuilder;
-import org.apache.hadoop.hbase.regionserver.RegionServerServices.RegionStateTransitionContext;
-import org.apache.hadoop.hbase.security.User;
-import org.apache.yetus.audience.InterfaceAudience;
-
-import org.apache.hadoop.hbase.shaded.com.google.common.base.Preconditions;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
-
-/**
- * Handles processing region merges. Put in a queue, owned by HRegionServer.
- */
-// TODO:UNUSED: REMOVE!!!
-@InterfaceAudience.Private
-class RegionMergeRequest implements Runnable {
-  private static final Log LOG = LogFactory.getLog(RegionMergeRequest.class);
-  private final RegionInfo region_a;
-  private final RegionInfo region_b;
-  private final HRegionServer server;
-  private final boolean forcible;
-  private final User user;
-
-  RegionMergeRequest(Region a, Region b, HRegionServer hrs, boolean forcible,
-      long masterSystemTime, User user) {
-    Preconditions.checkNotNull(hrs);
-    this.region_a = a.getRegionInfo();
-    this.region_b = b.getRegionInfo();
-    this.server = hrs;
-    this.forcible = forcible;
-    this.user = user;
-  }
-
-  @Override
-  public String toString() {
-    return "MergeRequest,regions:" + region_a + ", " + region_b + ", forcible="
-        + forcible;
-  }
-
-  private void doMerge() {
-    boolean success = false;
-    //server.metricsRegionServer.incrMergeRequest();
-
-    if (user != null && user.getUGI() != null) {
-      user.getUGI().doAs (new PrivilegedAction<Void>() {
-        @Override
-        public Void run() {
-          requestRegionMerge();
-          return null;
-        }
-      });
-    } else {
-      requestRegionMerge();
-    }
-  }
-
-  private void requestRegionMerge() {
-    final TableName table = region_a.getTable();
-    if (!table.equals(region_b.getTable())) {
-      LOG.error("Can't merge regions from two different tables: " + region_a + ", " + region_b);
-      return;
-    }
-
-    // TODO: fake merged region for compat with the report protocol
-    final RegionInfo merged = RegionInfoBuilder.newBuilder(table).build();
-
-    // Send the split request to the master. the master will do the validation on the split-key.
-    // The parent region will be unassigned and the two new regions will be assigned.
-    // hri_a and hri_b objects may not reflect the regions that will be created, those objectes
-    // are created just to pass the information to the reportRegionStateTransition().
-    if (!server.reportRegionStateTransition(new RegionStateTransitionContext(
-        TransitionCode.READY_TO_MERGE, HConstants.NO_SEQNUM, -1, merged, region_a, region_b))) {
-      LOG.error("Unable to ask master to merge: " + region_a + ", " + region_b);
-    }
-  }
-
-  @Override
-  public void run() {
-    if (this.server.isStopping() || this.server.isStopped()) {
-      LOG.debug("Skipping merge because server is stopping="
-          + this.server.isStopping() + " or stopped=" + this.server.isStopped());
-      return;
-    }
-
-    doMerge();
-  }
-}