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