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 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
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.ClusterMetrics;
022import org.apache.hadoop.hbase.ServerName;
023
024/**
025* Action that tries to restart the HRegionServer holding Meta.
026*/
027public class RestartRsHoldingMetaAction extends RestartActionBaseAction {
028  public RestartRsHoldingMetaAction(long sleepTime) {
029    super(sleepTime);
030  }
031  @Override
032  public void perform() throws Exception {
033    LOG.info("Performing action: Restart region server holding META");
034    ServerName server = cluster.getServerHoldingMeta();
035    if (server == null) {
036      LOG.warn("No server is holding hbase:meta right now.");
037      return;
038    }
039    ClusterMetrics clusterStatus = cluster.getClusterMetrics();
040    if (server.equals(clusterStatus.getMasterName())) {
041      // Master holds the meta, so restart the master.
042      restartMaster(server, sleepTime);
043    } else {
044      restartRs(server, sleepTime);
045    }
046  }
047}