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