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.commons.lang3.RandomUtils;
024import org.apache.hadoop.hbase.HBaseTestingUtility;
025import org.apache.hadoop.hbase.HRegionInfo;
026import org.apache.hadoop.hbase.TableName;
027import org.apache.hadoop.hbase.client.Admin;
028import org.slf4j.Logger;
029import org.slf4j.LoggerFactory;
030
031/**
032 * Action to merge regions of a table.
033 */
034public class MergeRandomAdjacentRegionsOfTableAction extends Action {
035  private static final Logger LOG =
036      LoggerFactory.getLogger(MergeRandomAdjacentRegionsOfTableAction.class);
037  private final TableName tableName;
038  private final long sleepTime;
039
040  public MergeRandomAdjacentRegionsOfTableAction(TableName tableName) {
041    this(-1, tableName);
042  }
043
044  public MergeRandomAdjacentRegionsOfTableAction(int sleepTime, TableName tableName) {
045    this.tableName = tableName;
046    this.sleepTime = sleepTime;
047  }
048
049  @Override
050  public void perform() throws Exception {
051    HBaseTestingUtility util = context.getHBaseIntegrationTestingUtility();
052    Admin admin = util.getAdmin();
053
054    LOG.info("Performing action: Merge random adjacent regions of table " + tableName);
055    List<HRegionInfo> regions = admin.getTableRegions(tableName);
056    if (regions == null || regions.size() < 2) {
057      LOG.info("Table " + tableName + " doesn't have enough regions to merge");
058      return;
059    }
060
061    int i = RandomUtils.nextInt(0, regions.size() - 1);
062    HRegionInfo a = regions.get(i++);
063    HRegionInfo b = regions.get(i);
064    LOG.debug("Merging " + a.getRegionNameAsString() + " and " + b.getRegionNameAsString());
065
066    // Don't try the merge if we're stopping
067    if (context.isStopping()) {
068      return;
069    }
070
071    try {
072      admin.mergeRegionsAsync(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
073    } catch (Exception ex) {
074      LOG.warn("Merge failed, might be caused by other chaos: " + ex.getMessage());
075    }
076    if (sleepTime > 0) {
077      Thread.sleep(sleepTime);
078    }
079  }
080}