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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.MetricMutableCounterLong;
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 MetricMutableCounterLong appendCount;
36    private final MetricMutableCounterLong slowAppendCount;
37    private final MetricHistogram syncTimeHisto;
38  
39  
40    public MetricsWALSourceImpl() {
41      this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
42    }
43  
44    public MetricsWALSourceImpl(String metricsName,
45                                String metricsDescription,
46                                String metricsContext,
47                                String metricsJmxContext) {
48      super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
49  
50      //Create and store the metrics that will be used.
51      appendTimeHisto = this.getMetricsRegistry().newHistogram(APPEND_TIME, APPEND_TIME_DESC);
52      appendSizeHisto = this.getMetricsRegistry().newHistogram(APPEND_SIZE, APPEND_SIZE_DESC);
53      appendCount = this.getMetricsRegistry().newCounter(APPEND_COUNT, APPEND_COUNT_DESC, 0l);
54      slowAppendCount = this.getMetricsRegistry().newCounter(SLOW_APPEND_COUNT, SLOW_APPEND_COUNT_DESC, 0l);
55      syncTimeHisto = this.getMetricsRegistry().newHistogram(SYNC_TIME, SYNC_TIME_DESC);
56    }
57  
58    @Override
59    public void incrementAppendSize(long size) {
60      appendSizeHisto.add(size);
61    }
62  
63    @Override
64    public void incrementAppendTime(long time) {
65      appendTimeHisto.add(time);
66    }
67  
68    @Override
69    public void incrementAppendCount() {
70      appendCount.incr();
71    }
72  
73    @Override
74    public void incrementSlowAppendCount() {
75      slowAppendCount.incr();
76    }
77  
78    @Override
79    public void incrementSyncTime(long time) {
80      syncTimeHisto.add(time);
81    }
82  }