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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.master.normalizer;
20  
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.hbase.CoordinatedStateException;
24  import org.apache.hadoop.hbase.ScheduledChore;
25  import org.apache.hadoop.hbase.classification.InterfaceAudience;
26  import org.apache.hadoop.hbase.master.HMaster;
27  
28  import java.io.IOException;
29  
30  /**
31   * Chore that will call {@link org.apache.hadoop.hbase.master.HMaster#normalizeRegions()}
32   * when needed.
33   */
34  @InterfaceAudience.Private
35  public class RegionNormalizerChore extends ScheduledChore {
36    private static final Log LOG = LogFactory.getLog(RegionNormalizerChore.class);
37  
38    private final HMaster master;
39  
40    public RegionNormalizerChore(HMaster master) {
41      super(master.getServerName() + "-RegionNormalizerChore", master,
42        master.getConfiguration().getInt("hbase.normalizer.period", 300000));
43      this.master = master;
44    }
45  
46    @Override
47    protected void chore() {
48      try {
49        master.normalizeRegions();
50      } catch (IOException | CoordinatedStateException e) {
51        LOG.error("Failed to normalize regions.", e);
52      }
53    }
54  }