001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.master.balancer;
019
020import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
021import org.apache.yetus.audience.InterfaceAudience;
022
023/**
024 * This metrics balancer uses extended source for stochastic load balancer to report its related
025 * metrics to JMX. For details, refer to HBASE-13965
026 */
027@InterfaceAudience.Private
028public class MetricsStochasticBalancer extends MetricsBalancer {
029  /**
030   * Use the stochastic source instead of the default source.
031   */
032  private MetricsStochasticBalancerSource stochasticSource = null;
033
034  public MetricsStochasticBalancer() {
035    initSource();
036  }
037
038  /**
039   * This function overrides the initSource in the MetricsBalancer, use
040   * MetricsStochasticBalancerSource instead of the MetricsBalancerSource.
041   */
042  @Override
043  protected void initSource() {
044    stochasticSource =
045      CompatibilitySingletonFactory.getInstance(MetricsStochasticBalancerSource.class);
046  }
047
048  @Override
049  public void balanceCluster(long time) {
050    stochasticSource.updateBalanceCluster(time);
051  }
052
053  @Override
054  public void incrMiscInvocations() {
055    stochasticSource.incrMiscInvocations();
056  }
057
058  /**
059   * Updates the balancer status tag reported to JMX
060   */
061  @Override
062  public void balancerStatus(boolean status) {
063    stochasticSource.updateBalancerStatus(status);
064  }
065
066  /**
067   * Updates the number of metrics reported to JMX
068   */
069  public void updateMetricsSize(int size) {
070    stochasticSource.updateMetricsSize(size);
071  }
072
073  /**
074   * Reports stochastic load balancer costs to JMX
075   */
076  public void updateStochasticCost(String tableName, String costFunctionName,
077    String costFunctionDesc, Double value) {
078    stochasticSource.updateStochasticCost(tableName, costFunctionName, costFunctionDesc, value);
079  }
080}