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.io.IOException; 022 023import org.apache.hadoop.hbase.ServerName; 024import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey; 025import org.slf4j.Logger; 026import org.slf4j.LoggerFactory; 027 028/** 029 * 030 * Fill the disk on a random regionserver. 031 */ 032public class FillDiskCommandAction extends SudoCommandAction { 033 private static final Logger LOG = LoggerFactory.getLogger(FillDiskCommandAction.class); 034 private long size; 035 private long duration; 036 private String path; 037 038 /** 039 * Fill the disk on a random regionserver. 040 * Please note that the file will be created regardless of the set duration or timeout. 041 * So please use timeout and duration big enough to avoid complication caused by retries. 042 * 043 * @param size size of the generated file in MB or fill the disk if set to 0 044 * @param duration the time this issue persists in milliseconds 045 * @param path the path to the generated file 046 * @param timeout the timeout for executing required commands on the region server in milliseconds 047 */ 048 public FillDiskCommandAction(long size, long duration, String path, long timeout) { 049 super(timeout); 050 this.size = size; 051 this.duration = duration; 052 this.path = path; 053 } 054 055 protected void localPerform() throws IOException { 056 LOG.info("Starting to execute FillDiskCommandAction"); 057 ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getCurrentServers()); 058 String hostname = server.getHostname(); 059 060 try { 061 clusterManager.execSudo(hostname, duration, getFillCommand()); 062 } catch (IOException ex) { 063 LOG.info("Potential timeout. We try to stop the dd process on target machine"); 064 clusterManager.execSudoWithRetries(hostname, timeout, getStopCommand()); 065 throw ex; 066 } finally { 067 clusterManager.execSudoWithRetries(hostname, timeout, getClearCommand()); 068 LOG.info("Finished to execute FillDiskCommandAction"); 069 } 070 } 071 072 private String getFillCommand(){ 073 if (size == 0){ 074 return String.format("dd if=/dev/urandom of=%s/garbage bs=1M iflag=fullblock", path); 075 } 076 return String.format("dd if=/dev/urandom of=%s/garbage bs=1M count=%s iflag=fullblock", 077 path, size); 078 } 079 080 private String getClearCommand(){ 081 return String.format("rm -f %s/garbage", path); 082 } 083 084 private String getStopCommand() { 085 return String.format("killall dd"); 086 } 087}