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 }