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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.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    private final MutableCounterLong logRollRequested;
41    private final MutableCounterLong lowReplicationLogRollRequested;
42  
43    public MetricsWALSourceImpl() {
44      this(METRICS_NAME, METRICS_DESCRIPTION, METRICS_CONTEXT, METRICS_JMX_CONTEXT);
45    }
46  
47    public MetricsWALSourceImpl(String metricsName,
48                                String metricsDescription,
49                                String metricsContext,
50                                String metricsJmxContext) {
51      super(metricsName, metricsDescription, metricsContext, metricsJmxContext);
52  
53      //Create and store the metrics that will be used.
54      appendTimeHisto = this.getMetricsRegistry().newHistogram(APPEND_TIME, APPEND_TIME_DESC);
55      appendSizeHisto = this.getMetricsRegistry().newHistogram(APPEND_SIZE, APPEND_SIZE_DESC);
56      appendCount = this.getMetricsRegistry().newCounter(APPEND_COUNT, APPEND_COUNT_DESC, 0l);
57      slowAppendCount =
58          this.getMetricsRegistry().newCounter(SLOW_APPEND_COUNT, SLOW_APPEND_COUNT_DESC, 0l);
59      syncTimeHisto = this.getMetricsRegistry().newHistogram(SYNC_TIME, SYNC_TIME_DESC);
60      logRollRequested =
61          this.getMetricsRegistry().newCounter(ROLL_REQUESTED, ROLL_REQUESTED_DESC, 0L);
62      lowReplicationLogRollRequested = this.getMetricsRegistry()
63          .newCounter(LOW_REPLICA_ROLL_REQUESTED, LOW_REPLICA_ROLL_REQUESTED_DESC, 0L);
64    }
65  
66    @Override
67    public void incrementAppendSize(long size) {
68      appendSizeHisto.add(size);
69    }
70  
71    @Override
72    public void incrementAppendTime(long time) {
73      appendTimeHisto.add(time);
74    }
75  
76    @Override
77    public void incrementAppendCount() {
78      appendCount.incr();
79    }
80  
81    @Override
82    public void incrementSlowAppendCount() {
83      slowAppendCount.incr();
84    }
85  
86    @Override
87    public void incrementSyncTime(long time) {
88      syncTimeHisto.add(time);
89    }
90  
91    @Override
92    public void incrementLogRollRequested() {
93      logRollRequested.incr();
94    }
95  
96    @Override
97    public void incrementLowReplicationLogRoll() {
98      lowReplicationLogRollRequested.incr();
99    }
100 }