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.replication.regionserver;
20
21 import org.apache.hadoop.classification.InterfaceAudience;
22 import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
23 import org.apache.hadoop.hbase.replication.regionserver.MetricsReplicationSource;
24
25 /**
26 * This class is for maintaining the various replication statistics for a sink and publishing them
27 * through the metrics interfaces.
28 */
29 @InterfaceAudience.Private
30 public class MetricsSink {
31
32 public static final String SINK_AGE_OF_LAST_APPLIED_OP = "sink.ageOfLastAppliedOp";
33 public static final String SINK_APPLIED_BATCHES = "sink.appliedBatches";
34 public static final String SINK_APPLIED_OPS = "sink.appliedOps";
35
36 private MetricsReplicationSource rms;
37 private long lastTimestampForAge = System.currentTimeMillis();
38
39 public MetricsSink() {
40 rms = CompatibilitySingletonFactory.getInstance(MetricsReplicationSource.class);
41 }
42
43 /**
44 * Set the age of the last applied operation
45 *
46 * @param timestamp The timestamp of the last operation applied.
47 * @return the age that was set
48 */
49 public long setAgeOfLastAppliedOp(long timestamp) {
50 lastTimestampForAge = timestamp;
51 long age = System.currentTimeMillis() - lastTimestampForAge;
52 rms.setGauge(SINK_AGE_OF_LAST_APPLIED_OP, age);
53 return age;
54 }
55
56 /**
57 * Refreshing the age makes sure the value returned is the actual one and
58 * not the one set a replication time
59 * @return refreshed age
60 */
61 public long refreshAgeOfLastAppliedOp() {
62 return setAgeOfLastAppliedOp(lastTimestampForAge);
63 }
64
65 /**
66 * Convience method to change metrics when a batch of operations are applied.
67 *
68 * @param batchSize
69 */
70 public void applyBatch(long batchSize) {
71 rms.incCounters(SINK_APPLIED_BATCHES, 1);
72 rms.incCounters(SINK_APPLIED_OPS, batchSize);
73 }
74
75 }