001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.balancer;
019
020import java.util.ArrayList;
021import java.util.List;
022import org.apache.hadoop.hbase.master.RegionPlan;
023import org.apache.yetus.audience.InterfaceAudience;
024
025import org.apache.hbase.thirdparty.com.google.common.collect.HashMultimap;
026import org.apache.hbase.thirdparty.com.google.common.collect.Multimaps;
027
028@InterfaceAudience.Private
029public class MoveBatchAction extends BalanceAction {
030  private final List<MoveRegionAction> moveActions;
031
032  MoveBatchAction(List<MoveRegionAction> moveActions) {
033    super(Type.MOVE_BATCH);
034    this.moveActions = moveActions;
035  }
036
037  @Override
038  BalanceAction undoAction() {
039    List<MoveRegionAction> undoMoves = new ArrayList<>(getMoveActions().size());
040    for (int i = getMoveActions().size() - 1; i >= 0; i--) {
041      MoveRegionAction move = getMoveActions().get(i);
042      undoMoves
043        .add(new MoveRegionAction(move.getRegion(), move.getToServer(), move.getFromServer()));
044    }
045    return new MoveBatchAction(undoMoves);
046  }
047
048  @Override
049  List<RegionPlan> toRegionPlans(BalancerClusterState cluster) {
050    List<RegionPlan> mbRegionPlans = new ArrayList<>(getMoveActions().size());
051    for (MoveRegionAction moveRegionAction : getMoveActions()) {
052      mbRegionPlans.add(new RegionPlan(cluster.regions[moveRegionAction.getRegion()],
053        cluster.servers[moveRegionAction.getFromServer()],
054        cluster.servers[moveRegionAction.getToServer()]));
055    }
056    return mbRegionPlans;
057  }
058
059  @Override
060  long getStepCount() {
061    return moveActions.size();
062  }
063
064  public HashMultimap<Integer, Integer> getServerToRegionsToRemove() {
065    return moveActions.stream().collect(Multimaps.toMultimap(MoveRegionAction::getFromServer,
066      MoveRegionAction::getRegion, HashMultimap::create));
067  }
068
069  public HashMultimap<Integer, Integer> getServerToRegionsToAdd() {
070    return moveActions.stream().collect(Multimaps.toMultimap(MoveRegionAction::getToServer,
071      MoveRegionAction::getRegion, HashMultimap::create));
072  }
073
074  List<MoveRegionAction> getMoveActions() {
075    return moveActions;
076  }
077}