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 org.apache.hadoop.hbase.ServerName;
021import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
022import org.apache.hadoop.hbase.zookeeper.ZKServerTool;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026/**
027 * Action that restarts a random zookeeper node.
028 */
029public class RestartRandomZKNodeAction extends RestartActionBaseAction {
030  private static final Logger LOG = LoggerFactory.getLogger(RestartRandomZKNodeAction.class);
031
032  public RestartRandomZKNodeAction(long sleepTime) {
033    super(sleepTime);
034  }
035
036  @Override
037  protected Logger getLogger() {
038    return LOG;
039  }
040
041  @Override
042  public void perform() throws Exception {
043    getLogger().info("Performing action: Restart random zookeeper node");
044    ServerName server =
045      PolicyBasedChaosMonkey.selectRandomItem(ZKServerTool.readZKNodes(getConf()));
046    restartZKNode(server, sleepTime);
047  }
048}