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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.hadoop.hbase.CompatibilitySingletonFactory;
22  
23  /**
24   * This metrics balancer uses extended source for stochastic load balancer
25   * to report its related metrics to JMX. For details, refer to HBASE-13965
26   */
27  public class MetricsStochasticBalancer extends MetricsBalancer {
28    /**
29     * Use the stochastic source instead of the default source.
30     */
31    private MetricsStochasticBalancerSource stochasticSource = null;
32  
33    public MetricsStochasticBalancer() {
34      initSource();
35    }
36  
37    /**
38     * This function overrides the initSource in the MetricsBalancer, use
39     * MetricsStochasticBalancerSource instead of the MetricsBalancerSource.
40     */
41    @Override
42    protected void initSource() {
43      stochasticSource =
44          CompatibilitySingletonFactory.getInstance(MetricsStochasticBalancerSource.class);
45    }
46  
47    @Override
48    public void balanceCluster(long time) {
49      stochasticSource.updateBalanceCluster(time);
50    }
51  
52    @Override
53    public void incrMiscInvocations() {
54      stochasticSource.incrMiscInvocations();
55    }
56  
57    /**
58     * Updates the number of metrics reported to JMX
59     */
60    public void updateMetricsSize(int size) {
61      stochasticSource.updateMetricsSize(size);
62    }
63  
64    /**
65     * Reports stochastic load balancer costs to JMX
66     */
67    public void updateStochasticCost(String tableName, String costFunctionName,
68        String costFunctionDesc, Double value) {
69      stochasticSource.updateStochasticCost(tableName, costFunctionName, costFunctionDesc, value);
70    }
71  }