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 */
018
019package org.apache.hadoop.hbase.chaos.actions;
020
021import java.io.IOException;
022import java.util.Collection;
023import java.util.Collections;
024import java.util.List;
025
026import org.apache.commons.lang3.RandomUtils;
027import org.apache.hadoop.hbase.HRegionInfo;
028import org.apache.hadoop.hbase.ServerName;
029import org.apache.hadoop.hbase.TableName;
030import org.apache.hadoop.hbase.chaos.factories.MonkeyConstants;
031import org.apache.hadoop.hbase.client.Admin;
032import org.apache.hadoop.hbase.client.RegionInfo;
033import org.slf4j.Logger;
034import org.slf4j.LoggerFactory;
035
036/**
037* Action that tries to move every region of a table.
038*/
039public class MoveRegionsOfTableAction extends Action {
040  private static final Logger LOG =
041      LoggerFactory.getLogger(MoveRegionsOfTableAction.class);
042  private final long sleepTime;
043  private final TableName tableName;
044  private final long maxTime;
045
046  public MoveRegionsOfTableAction(TableName tableName) {
047    this(-1, MonkeyConstants.DEFAULT_MOVE_REGIONS_MAX_TIME, tableName);
048  }
049
050  public MoveRegionsOfTableAction(long sleepTime, long maxSleepTime, TableName tableName) {
051    this.sleepTime = sleepTime;
052    this.tableName = tableName;
053    this.maxTime = maxSleepTime;
054  }
055
056  @Override
057  public void perform() throws Exception {
058    if (sleepTime > 0) {
059      Thread.sleep(sleepTime);
060    }
061
062    Admin admin = this.context.getHBaseIntegrationTestingUtility().getAdmin();
063    ServerName[] servers = getServers(admin);
064
065    LOG.info("Performing action: Move regions of table {}", tableName);
066    List<HRegionInfo> regions = admin.getTableRegions(tableName);
067    if (regions == null || regions.isEmpty()) {
068      LOG.info("Table {} doesn't have regions to move", tableName);
069      return;
070    }
071
072    Collections.shuffle(regions);
073
074    long start = System.currentTimeMillis();
075    for (HRegionInfo regionInfo:regions) {
076
077      // Don't try the move if we're stopping
078      if (context.isStopping()) {
079        return;
080      }
081
082      moveRegion(admin, servers, regionInfo);
083      if (sleepTime > 0) {
084        Thread.sleep(sleepTime);
085      }
086
087      // put a limit on max num regions. Otherwise, this won't finish
088      // with a sleep time of 10sec, 100 regions will finish in 16min
089      if (System.currentTimeMillis() - start > maxTime) {
090        break;
091      }
092    }
093  }
094
095  static ServerName [] getServers(Admin admin) throws IOException {
096    Collection<ServerName> serversList = admin.getRegionServers();
097    return serversList.toArray(new ServerName[serversList.size()]);
098  }
099
100  static void moveRegion(Admin admin, ServerName [] servers, RegionInfo regionInfo) {
101    try {
102      ServerName destServerName = servers[RandomUtils.nextInt(0, servers.length)];
103      LOG.debug("Moving {} to {}", regionInfo.getRegionNameAsString(), destServerName);
104      admin.move(regionInfo.getEncodedNameAsBytes(), destServerName);
105    } catch (Exception ex) {
106      LOG.warn("Move failed, might be caused by other chaos: {}", ex.getMessage());
107    }
108  }
109}