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}