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 }