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 java.util.concurrent.ThreadLocalRandom;
022import org.apache.hadoop.hbase.HBaseTestingUtility;
023import org.apache.hadoop.hbase.TableName;
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 to merge regions of a table.
031 */
032public class MergeRandomAdjacentRegionsOfTableAction extends Action {
033  private static final Logger LOG =
034    LoggerFactory.getLogger(MergeRandomAdjacentRegionsOfTableAction.class);
035  private final TableName tableName;
036  private final long sleepTime;
037
038  public MergeRandomAdjacentRegionsOfTableAction(TableName tableName) {
039    this(-1, tableName);
040  }
041
042  public MergeRandomAdjacentRegionsOfTableAction(int sleepTime, TableName tableName) {
043    this.tableName = tableName;
044    this.sleepTime = sleepTime;
045  }
046
047  @Override
048  protected Logger getLogger() {
049    return LOG;
050  }
051
052  @Override
053  public void perform() throws Exception {
054    HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
055    Admin admin = util.getAdmin();
056
057    getLogger().info("Performing action: Merge random adjacent regions of table " + tableName);
058    List<RegionInfo> regions = admin.getRegions(tableName);
059    if (regions == null || regions.size() < 2) {
060      getLogger().info("Table " + tableName + " doesn't have enough regions to merge");
061      return;
062    }
063
064    int i = ThreadLocalRandom.current().nextInt(regions.size() - 1);
065    RegionInfo a = regions.get(i++);
066    RegionInfo b = regions.get(i);
067    getLogger().debug("Merging " + a.getRegionNameAsString() + " and " + b.getRegionNameAsString());
068
069    // Don't try the merge if we're stopping
070    if (context.isStopping()) {
071      return;
072    }
073
074    try {
075      admin.mergeRegionsAsync(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false).get();
076    } catch (Exception ex) {
077      getLogger().warn("Merge failed, might be caused by other chaos: " + ex.getMessage());
078    }
079    if (sleepTime > 0) {
080      Thread.sleep(sleepTime);
081    }
082  }
083}