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