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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.master.balancer;
20  
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.classification.InterfaceAudience;
24  import org.apache.hadoop.hbase.Chore;
25  import org.apache.hadoop.hbase.HBaseIOException;
26  import org.apache.hadoop.hbase.master.HMaster;
27  
28  /**
29   * Chore that will call HMaster.balance{@link org.apache.hadoop.hbase.master.HMaster#balance()} when
30   * needed.
31   */
32  @InterfaceAudience.Private
33  public class BalancerChore extends Chore {
34    private static final Log LOG = LogFactory.getLog(BalancerChore.class);
35  
36    private final HMaster master;
37  
38    public BalancerChore(HMaster master) {
39      super(master.getServerName() + "-BalancerChore",
40          master.getConfiguration().getInt("hbase.balancer.period", 300000),
41          master);
42      this.master = master;
43    }
44  
45    @Override
46    protected void chore() {
47      try {
48        master.balance();
49      } catch (HBaseIOException e) {
50        LOG.error("Failed to balance.", e);
51      }
52    }
53  }