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