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;
022import org.apache.hadoop.hbase.ServerName;
023import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 *
029 * Reorder network packets on a random regionserver.
030 */
031public class ReorderPacketsCommandAction extends TCCommandAction {
032  private static final Logger LOG = LoggerFactory.getLogger(ReorderPacketsCommandAction.class);
033  private final float ratio;
034  private final long duration;
035  private final long delay;
036
037  /**
038   * Reorder network packets on a random regionserver.
039   *
040   * @param ratio the ratio of packets reordered
041   * @param duration the time this issue persists in milliseconds
042   * @param delay the delay between reordered and non-reordered packets in milliseconds
043   * @param timeout the timeout for executing required commands on the region server in milliseconds
044   * @param network network interface the regionserver uses for communication
045   */
046  public ReorderPacketsCommandAction(float ratio, long duration, long delay, long timeout,
047      String network) {
048    super(timeout, network);
049    this.ratio = ratio;
050    this.duration = duration;
051    this.delay = delay;
052  }
053
054  @Override protected Logger getLogger() {
055    return LOG;
056  }
057
058  protected void localPerform() throws IOException {
059    getLogger().info("Starting to execute ReorderPacketsCommandAction");
060    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(getCurrentServers());
061    String hostname = server.getHostname();
062
063    try {
064      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(ADD));
065      Thread.sleep(duration);
066    } catch (InterruptedException e) {
067      getLogger().debug("Failed to run the command for the full duration", e);
068    } finally {
069      clusterManager.execSudoWithRetries(hostname, timeout, getCommand(DELETE));
070    }
071
072    getLogger().info("Finished to execute ReorderPacketsCommandAction");
073  }
074
075  private String getCommand(String operation){
076    return String.format("tc qdisc %s dev %s root netem delay %sms reorder %s%% 50%%",
077        operation, network, delay, ratio * 100);
078  }
079}