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 /**
22 * This interface extends the basic metrics balancer source to add a function
23 * to report metrics that related to stochastic load balancer. The purpose is to
24 * offer an insight to the internal cost calculations that can be useful to tune
25 * the balancer. For details, refer to HBASE-13965
26 */
27 public interface MetricsStochasticBalancerSource extends MetricsBalancerSource {
28
29 /**
30 * Updates the number of metrics reported to JMX
31 */
32 public void updateMetricsSize(int size);
33
34 /**
35 * Reports stochastic load balancer costs to JMX
36 */
37 public void updateStochasticCost(String tableName, String costFunctionName,
38 String costFunctionDesc, Double value);
39 }