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