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}