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;
023import org.slf4j.Logger;
024import org.slf4j.LoggerFactory;
025
026/**
027* Action that tries to restart the HRegionServer holding Meta.
028*/
029public class RestartRsHoldingMetaAction extends RestartActionBaseAction {
030  private static final Logger LOG =
031      LoggerFactory.getLogger(RestartRsHoldingMetaAction.class);
032
033  public RestartRsHoldingMetaAction(long sleepTime) {
034    super(sleepTime);
035  }
036  @Override
037  public void perform() throws Exception {
038    LOG.info("Performing action: Restart region server holding META");
039    ServerName server = cluster.getServerHoldingMeta();
040    if (server == null) {
041      LOG.warn("No server is holding hbase:meta right now.");
042      return;
043    }
044    ClusterMetrics clusterStatus = cluster.getClusterMetrics();
045    if (server.equals(clusterStatus.getMasterName())) {
046      // Master holds the meta, so restart the master.
047      restartMaster(server, sleepTime);
048    } else {
049      restartRs(server, sleepTime);
050    }
051  }
052}