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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.regionserver.wal;
20  
21  import org.apache.hadoop.classification.InterfaceAudience;
22  import org.apache.hadoop.hbase.metrics.BaseSourceImpl;
23  import org.apache.hadoop.metrics2.MetricHistogram;
24  import org.apache.hadoop.metrics2.lib.MutableCounterLong;
25  
26  
27  /**
28   * Class that transitions metrics from HLog's MetricsWAL into the metrics subsystem.
29   *
30   * Implements BaseSource through BaseSourceImpl, following the pattern.
31   */
32  @InterfaceAudience.Private
33  public class MetricsWALSourceImpl extends BaseSourceImpl implements MetricsWALSource {
34  
35    private final MetricHistogram appendSizeHisto;
36    private final MetricHistogram appendTimeHisto;
37    private final MetricHistogram syncTimeHisto;
38    private final MutableCounterLong appendCount;
39    private final MutableCounterLong slowAppendCount;
40  
41    public MetricsWALSourceImpl() {
42      this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
43    }
44  
45    public MetricsWALSourceImpl(String metricsName,
46                                String metricsDescription,
47                                String metricsContext,
48                                String metricsJmxContext) {
49      super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
50  
51      //Create and store the metrics that will be used.
52      appendTimeHisto = this.getMetricsRegistry().newHistogram(APPEND_TIME, APPEND_TIME_DESC);
53      appendSizeHisto = this.getMetricsRegistry().newHistogram(APPEND_SIZE, APPEND_SIZE_DESC);
54      appendCount = this.getMetricsRegistry().newCounter(APPEND_COUNT, APPEND_COUNT_DESC, 0l);
55      slowAppendCount = this.getMetricsRegistry().newCounter(SLOW_APPEND_COUNT, SLOW_APPEND_COUNT_DESC, 0l);
56      syncTimeHisto = this.getMetricsRegistry().newHistogram(SYNC_TIME, SYNC_TIME_DESC);
57    }
58  
59    @Override
60    public void incrementAppendSize(long size) {
61      appendSizeHisto.add(size);
62    }
63  
64    @Override
65    public void incrementAppendTime(long time) {
66      appendTimeHisto.add(time);
67    }
68  
69    @Override
70    public void incrementAppendCount() {
71      appendCount.incr();
72    }
73  
74    @Override
75    public void incrementSlowAppendCount() {
76      slowAppendCount.incr();
77    }
78  
79    @Override
80    public void incrementSyncTime(long time) {
81      syncTimeHisto.add(time);
82    }
83  }