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 * Action adds latency to communication on a random regionserver.
030 */
031public class DelayPacketsCommandAction extends TCCommandAction {
032  private static final Logger LOG = LoggerFactory.getLogger(DelayPacketsCommandAction.class);
033  private long delay;
034  private long duration;
035
036  /**
037   * Adds latency to communication on a random region server
038   *
039   * @param delay the latency wil be delay +/-50% in milliseconds
040   * @param duration the time this issue persists in milliseconds
041   * @param timeout the timeout for executing required commands on the region server in milliseconds
042   * @param network network interface the regionserver uses for communication
043   */
044  public DelayPacketsCommandAction(long delay, long duration, long timeout, String network) {
045    super(timeout, network);
046    this.delay = delay;
047    this.duration = duration;
048  }
049
050  protected void localPerform() throws IOException {
051    LOG.info("Starting to execute DelayPacketsCommandAction");
052    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getCurrentServers());
053    String hostname = server.getHostname();
054
055    try {
056      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(ADD));
057      Thread.sleep(duration);
058    } catch (InterruptedException e) {
059      LOG.debug("Failed to run the command for the full duration", e);
060    } finally {
061      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(DELETE));
062    }
063
064    LOG.info("Finished to execute DelayPacketsCommandAction");
065  }
066
067  private String getCommand(String operation){
068    return String.format("tc qdisc %s dev %s root netem delay %sms %sms",
069        operation, network, delay, delay/2);
070  }
071}