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.concurrent.ConcurrentHashMap;
021import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
022import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
023import org.apache.hadoop.hbase.metrics.Interns;
024import org.apache.hadoop.metrics2.MetricsCollector;
025import org.apache.hadoop.metrics2.MetricsRecordBuilder;
026import org.apache.yetus.audience.InterfaceAudience;
027import org.slf4j.Logger;
028import org.slf4j.LoggerFactory;
029
030@InterfaceAudience.Private
031public class MetricsTableAggregateSourceImpl extends BaseSourceImpl
032  implements MetricsTableAggregateSource {
033
034  private static final Logger LOG = LoggerFactory.getLogger(MetricsTableAggregateSourceImpl.class);
035  private ConcurrentHashMap<String, MetricsTableSource> tableSources = new ConcurrentHashMap<>();
036
037  public MetricsTableAggregateSourceImpl() {
038    this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
039  }
040
041  public MetricsTableAggregateSourceImpl(String metricsName, String metricsDescription,
042    String metricsContext, String metricsJmxContext) {
043    super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
044  }
045
046  private void register(MetricsTableSource source) {
047    source.registerMetrics();
048  }
049
050  @Override
051  public void deleteTableSource(String table) {
052    try {
053      MetricsTableSource source = tableSources.remove(table);
054      if (source != null) {
055        source.close();
056      }
057    } catch (Exception e) {
058      // Ignored. If this errors out it means that someone is double
059      // closing the user source and the user metrics is already nulled out.
060      LOG.info("Error trying to remove " + table + " from " + getClass().getSimpleName(), e);
061    }
062  }
063
064  @Override
065  public MetricsTableSource getOrCreateTableSource(String table,
066    MetricsTableWrapperAggregate wrapper) {
067    MetricsTableSource source = tableSources.get(table);
068    if (source != null) {
069      return source;
070    }
071    MetricsTableSource newSource = CompatibilitySingletonFactory
072      .getInstance(MetricsRegionServerSourceFactory.class).createTable(table, wrapper);
073    return tableSources.computeIfAbsent(table, k -> {
074      // register the new metrics now
075      newSource.registerMetrics();
076      return newSource;
077    });
078  }
079
080  /**
081   * Yes this is a get function that doesn't return anything. Thanks Hadoop for breaking all
082   * expectations of java programmers. Instead of returning anything Hadoop metrics expects
083   * getMetrics to push the metrics into the collector.
084   * @param collector the collector
085   * @param all       get all the metrics regardless of when they last changed.
086   */
087  @Override
088  public void getMetrics(MetricsCollector collector, boolean all) {
089    MetricsRecordBuilder mrb = collector.addRecord(metricsName);
090    if (tableSources != null) {
091      for (MetricsTableSource tableMetricSource : tableSources.values()) {
092        if (tableMetricSource instanceof MetricsTableSourceImpl) {
093          ((MetricsTableSourceImpl) tableMetricSource).snapshot(mrb, all);
094        }
095      }
096      mrb.addGauge(Interns.info(NUM_TABLES, NUMBER_OF_TABLES_DESC), tableSources.size());
097      metricsRegistry.snapshot(mrb, all);
098    }
099  }
100}