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}