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.regionserver; 019 020import java.util.Collections; 021import java.util.Set; 022import java.util.concurrent.ConcurrentHashMap; 023import java.util.concurrent.TimeUnit; 024import org.apache.hadoop.hbase.metrics.BaseSourceImpl; 025import org.apache.hadoop.metrics2.MetricsCollector; 026import org.apache.hadoop.metrics2.MetricsRecordBuilder; 027import org.apache.hadoop.metrics2.impl.JmxCacheBuster; 028import org.apache.hadoop.metrics2.lib.MetricsExecutorImpl; 029import org.apache.yetus.audience.InterfaceAudience; 030import org.slf4j.Logger; 031import org.slf4j.LoggerFactory; 032 033@InterfaceAudience.Private 034public class MetricsRegionAggregateSourceImpl extends BaseSourceImpl 035 implements MetricsRegionAggregateSource { 036 037 private static final Logger LOG = LoggerFactory.getLogger(MetricsRegionAggregateSourceImpl.class); 038 039 private final MetricsExecutorImpl executor = new MetricsExecutorImpl(); 040 041 private final Set<MetricsRegionSource> regionSources = 042 Collections.newSetFromMap(new ConcurrentHashMap<MetricsRegionSource, Boolean>()); 043 044 public MetricsRegionAggregateSourceImpl() { 045 this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT); 046 } 047 048 public MetricsRegionAggregateSourceImpl(String metricsName, String metricsDescription, 049 String metricsContext, String metricsJmxContext) { 050 super(metricsName, metricsDescription, metricsContext, metricsJmxContext); 051 052 // Every few mins clean the JMX cache. 053 executor.getExecutor().scheduleWithFixedDelay(new Runnable() { 054 @Override 055 public void run() { 056 JmxCacheBuster.clearJmxCache(); 057 } 058 }, 5, 5, TimeUnit.MINUTES); 059 } 060 061 @Override 062 public void register(MetricsRegionSource source) { 063 regionSources.add(source); 064 clearCache(); 065 } 066 067 @Override 068 public void deregister(MetricsRegionSource toRemove) { 069 try { 070 regionSources.remove(toRemove); 071 } catch (Exception e) { 072 // Ignored. If this errors out it means that someone is double 073 // closing the region source and the region is already nulled out. 074 LOG.info("Error trying to remove " + toRemove + " from " + this.getClass().getSimpleName(), 075 e); 076 } 077 clearCache(); 078 } 079 080 private synchronized void clearCache() { 081 JmxCacheBuster.clearJmxCache(); 082 } 083 084 /** 085 * Yes this is a get function that doesn't return anything. Thanks Hadoop for breaking all 086 * expectations of java programmers. Instead of returning anything Hadoop metrics expects 087 * getMetrics to push the metrics into the collector. 088 * @param collector the collector 089 * @param all get all the metrics regardless of when they last changed. 090 */ 091 @Override 092 public void getMetrics(MetricsCollector collector, boolean all) { 093 MetricsRecordBuilder mrb = collector.addRecord(metricsName); 094 095 if (regionSources != null) { 096 for (MetricsRegionSource regionMetricSource : regionSources) { 097 if (regionMetricSource instanceof MetricsRegionSourceImpl) { 098 ((MetricsRegionSourceImpl) regionMetricSource).snapshot(mrb, all); 099 } 100 } 101 metricsRegistry.snapshot(mrb, all); 102 } 103 } 104}