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 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
26
27 /**
28 * Action that restarts a random zookeeper node.
29 */
30 public class RestartRandomZKNodeAction extends RestartActionBaseAction {
31 private static final Logger LOG = LoggerFactory.getLogger(RestartRandomZKNodeAction.class);
32
33 public RestartRandomZKNodeAction(long sleepTime) {
34 super(sleepTime);
35 }
36
37 @Override protected Logger getLogger() {
38 return LOG;
39 }
40
41 @Override
42 public void perform() throws Exception {
43 getLogger().info("Performing action: Restart random zookeeper node");
44 ServerName server = PolicyBasedChaosMonkey.selectRandomItem(
45 ZKServerTool.readZKNodes(getConf()));
46 restartZKNode(server, sleepTime);
47 }
48 }