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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    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
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.ClusterStatus;
22  import org.apache.hadoop.hbase.ServerName;
23  
24  /**
25  * Action that tries to restart the HRegionServer holding Meta.
26  */
27  public class RestartRsHoldingMetaAction extends RestartActionBaseAction {
28    public RestartRsHoldingMetaAction(long sleepTime) {
29      super(sleepTime);
30    }
31    @Override
32    public void perform() throws Exception {
33      LOG.info("Performing action: Restart region server holding META");
34      ServerName server = cluster.getServerHoldingMeta();
35      if (server == null) {
36        LOG.warn("No server is holding hbase:meta right now.");
37        return;
38      }
39      ClusterStatus clusterStatus = cluster.getClusterStatus();
40      if (server.equals(clusterStatus.getMaster())) {
41        // Master holds the meta, so restart the master.
42        restartMaster(server, sleepTime);
43      } else {
44        restartRs(server, sleepTime);
45      }
46    }
47  }