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.chaos.actions;
019
020import java.util.List;
021import org.apache.hadoop.hbase.HBaseTestingUtility;
022import org.apache.hadoop.hbase.TableName;
023import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
024import org.apache.hadoop.hbase.client.Admin;
025import org.apache.hadoop.hbase.client.RegionInfo;
026import org.slf4j.Logger;
027import org.slf4j.LoggerFactory;
028
029/**
030 * Action that tries to move a random region of a table.
031 */
032public class MoveRandomRegionOfTableAction extends Action {
033  private static final Logger LOG = LoggerFactory.getLogger(MoveRandomRegionOfTableAction.class);
034  private final long sleepTime;
035  private final TableName tableName;
036
037  public MoveRandomRegionOfTableAction(TableName tableName) {
038    this(-1, tableName);
039  }
040
041  public MoveRandomRegionOfTableAction(long sleepTime, TableName tableName) {
042    this.sleepTime = sleepTime;
043    this.tableName = tableName;
044  }
045
046  @Override
047  protected Logger getLogger() {
048    return LOG;
049  }
050
051  @Override
052  public void perform() throws Exception {
053    if (sleepTime > 0) {
054      Thread.sleep(sleepTime);
055    }
056
057    HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
058    Admin admin = util.getAdmin();
059
060    getLogger().info("Performing action: Move random region of table " + tableName);
061    List<RegionInfo> regions = admin.getRegions(tableName);
062    if (regions == null || regions.isEmpty()) {
063      getLogger().info("Table " + tableName + " doesn't have regions to move");
064      return;
065    }
066
067    RegionInfo region = PolicyBasedChaosMonkey.selectRandomItem(regions.toArray(new RegionInfo[0]));
068    getLogger().debug("Move random region {}", region.getRegionNameAsString());
069    // Use facility over in MoveRegionsOfTableAction...
070    MoveRegionsOfTableAction.moveRegion(admin, MoveRegionsOfTableAction.getServers(admin), region,
071      getLogger());
072    if (sleepTime > 0) {
073      Thread.sleep(sleepTime);
074    }
075  }
076}