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 */
018package org.apache.hadoop.hbase.chaos.actions;
019
020import java.io.IOException;
021import org.apache.hadoop.hbase.ServerName;
022import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026/**
027 * Reorder network packets on a random regionserver.
028 */
029public class ReorderPacketsCommandAction extends TCCommandAction {
030  private static final Logger LOG = LoggerFactory.getLogger(ReorderPacketsCommandAction.class);
031  private final float ratio;
032  private final long duration;
033  private final long delay;
034
035  /**
036   * Reorder network packets on a random regionserver.
037   * @param ratio    the ratio of packets reordered
038   * @param duration the time this issue persists in milliseconds
039   * @param delay    the delay between reordered and non-reordered packets in milliseconds
040   * @param timeout  the timeout for executing required commands on the region server in
041   *                 milliseconds
042   * @param network  network interface the regionserver uses for communication
043   */
044  public ReorderPacketsCommandAction(float ratio, long duration, long delay, long timeout,
045    String network) {
046    super(timeout, network);
047    this.ratio = ratio;
048    this.duration = duration;
049    this.delay = delay;
050  }
051
052  @Override
053  protected Logger getLogger() {
054    return LOG;
055  }
056
057  protected void localPerform() throws IOException {
058    getLogger().info("Starting to execute ReorderPacketsCommandAction");
059    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getCurrentServers());
060    String hostname = server.getHostname();
061
062    try {
063      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(ADD));
064      Thread.sleep(duration);
065    } catch (InterruptedException e) {
066      getLogger().debug("Failed to run the command for the full duration", e);
067    } finally {
068      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(DELETE));
069    }
070
071    getLogger().info("Finished to execute ReorderPacketsCommandAction");
072  }
073
074  private String getCommand(String operation) {
075    return String.format("tc qdisc %s dev %s root netem delay %sms reorder %s%% 50%%", operation,
076      network, delay, ratio * 100);
077  }
078}