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 * <p>
010 * http://www.apache.org/licenses/LICENSE-2.0
011 * <p>
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 org.apache.hadoop.hbase.ServerName;
022import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
023import org.apache.hadoop.hbase.zookeeper.ZKServerTool;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026
027/**
028 * Action that restarts a random zookeeper node.
029 */
030public class RestartRandomZKNodeAction extends RestartActionBaseAction {
031  private static final Logger LOG = LoggerFactory.getLogger(RestartRandomZKNodeAction.class);
032
033  public RestartRandomZKNodeAction(long sleepTime) {
034    super(sleepTime);
035  }
036
037  @Override
038  public void perform() throws Exception {
039    LOG.info("Performing action: Restart random zookeeper node");
040    ServerName server = PolicyBasedChaosMonkey.selectRandomItem(
041        ZKServerTool.readZKNodes(getConf()));
042    restartZKNode(server, sleepTime);
043  }
044}