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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 java.io.InterruptedIOException;
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  import org.apache.hadoop.hbase.master.LoadBalancer;
29  
30  /**
31   * Chore that will feed the balancer the cluster status.
32   */
33  @InterfaceAudience.Private
34  public class ClusterStatusChore extends ScheduledChore {
35    private static final Log LOG = LogFactory.getLog(ClusterStatusChore.class);
36    private final HMaster master;
37    private final LoadBalancer balancer;
38  
39    public ClusterStatusChore(HMaster master, LoadBalancer balancer) {
40      super(master.getServerName() + "-ClusterStatusChore", master, master.getConfiguration().getInt(
41        "hbase.balancer.statusPeriod", 60000));
42      this.master = master;
43      this.balancer = balancer;
44    }
45  
46    @Override
47    protected void chore() {
48      try {
49        balancer.setClusterStatus(master.getClusterStatus());
50      } catch (InterruptedIOException e) {
51        LOG.warn("Ignoring interruption", e);
52      }
53    }
54  }