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 }