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