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.EnumSet;
025import java.util.List;
026
027import org.apache.commons.lang3.RandomUtils;
028import org.apache.hadoop.hbase.ClusterMetrics.Option;
029import org.apache.hadoop.hbase.HRegionInfo;
030import org.apache.hadoop.hbase.ServerName;
031import org.apache.hadoop.hbase.TableName;
032import org.apache.hadoop.hbase.chaos.factories.MonkeyConstants;
033import org.apache.hadoop.hbase.client.Admin;
034import org.apache.hadoop.hbase.client.RegionInfo;
035import org.apache.hadoop.hbase.util.Bytes;
036import org.slf4j.Logger;
037import org.slf4j.LoggerFactory;
038
039/**
040* Action that tries to move every region of a table.
041*/
042public class MoveRegionsOfTableAction extends Action {
043  private static final Logger LOG =
044      LoggerFactory.getLogger(MoveRegionsOfTableAction.class);
045  private final long sleepTime;
046  private final TableName tableName;
047  private final long maxTime;
048
049  public MoveRegionsOfTableAction(TableName tableName) {
050    this(-1, MonkeyConstants.DEFAULT_MOVE_REGIONS_MAX_TIME, tableName);
051  }
052
053  public MoveRegionsOfTableAction(long sleepTime, long maxSleepTime, TableName tableName) {
054    this.sleepTime = sleepTime;
055    this.tableName = tableName;
056    this.maxTime = maxSleepTime;
057  }
058
059  @Override
060  public void perform() throws Exception {
061    if (sleepTime > 0) {
062      Thread.sleep(sleepTime);
063    }
064
065    Admin admin = this.context.getHBaseIntegrationTestingUtility().getAdmin();
066    ServerName[] servers = getServers(admin);
067
068    LOG.info("Performing action: Move regions of table {}", tableName);
069    List<HRegionInfo> regions = admin.getTableRegions(tableName);
070    if (regions == null || regions.isEmpty()) {
071      LOG.info("Table {} doesn't have regions to move", tableName);
072      return;
073    }
074
075    Collections.shuffle(regions);
076
077    long start = System.currentTimeMillis();
078    for (HRegionInfo regionInfo:regions) {
079
080      // Don't try the move if we're stopping
081      if (context.isStopping()) {
082        return;
083      }
084
085      moveRegion(admin, servers, regionInfo);
086      if (sleepTime > 0) {
087        Thread.sleep(sleepTime);
088      }
089
090      // put a limit on max num regions. Otherwise, this won't finish
091      // with a sleep time of 10sec, 100 regions will finish in 16min
092      if (System.currentTimeMillis() - start > maxTime) {
093        break;
094      }
095    }
096  }
097
098  static ServerName [] getServers(Admin admin) throws IOException {
099    Collection<ServerName> serversList =
100        admin.getClusterMetrics(EnumSet.of(Option.LIVE_SERVERS)).getLiveServerMetrics().keySet();
101    return serversList.toArray(new ServerName[serversList.size()]);
102  }
103
104  static void moveRegion(Admin admin, ServerName [] servers, RegionInfo regionInfo) {
105    try {
106      String destServerName = servers[RandomUtils.nextInt(0, servers.length)].getServerName();
107      LOG.debug("Moving {} to {}", regionInfo.getRegionNameAsString(), destServerName);
108      admin.move(regionInfo.getEncodedNameAsBytes(), Bytes.toBytes(destServerName));
109    } catch (Exception ex) {
110      LOG.warn("Move failed, might be caused by other chaos: {}", ex.getMessage());
111    }
112  }
113}