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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    * <p>
10   * http://www.apache.org/licenses/LICENSE-2.0
11   * <p>
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.chaos.actions;
20  
21  import org.apache.hadoop.hbase.ServerName;
22  import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
23  import org.apache.hadoop.hbase.zookeeper.ZKServerTool;
24  
25  /**
26   * Action that restarts a random zookeeper node.
27   */
28  public class RestartRandomZKNodeAction extends RestartActionBaseAction {
29    public RestartRandomZKNodeAction(long sleepTime) {
30      super(sleepTime);
31    }
32  
33    @Override
34    public void perform() throws Exception {
35      LOG.info("Performing action: Restart random zookeeper node");
36      ServerName server = PolicyBasedChaosMonkey.selectRandomItem(
37          ZKServerTool.readZKNodes(getConf()));
38      restartZKNode(server, sleepTime);
39    }
40  }