1 /**
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 package org.apache.hadoop.hbase.regionserver.wal;
21
22 import org.apache.commons.logging.Log;
23 import org.apache.commons.logging.LogFactory;
24 import org.apache.hadoop.classification.InterfaceAudience;
25 import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
26 import org.apache.hadoop.util.StringUtils;
27
28
29 /**
30 * Class used to push numbers about the WAL into the metrics subsystem. This will take a
31 * single function call and turn it into multiple manipulations of the hadoop metrics system.
32 */
33 @InterfaceAudience.Private
34 public class MetricsWAL {
35 static final Log LOG = LogFactory.getLog(MetricsWAL.class);
36
37 private final MetricsWALSource source;
38
39 public MetricsWAL() {
40 source = CompatibilitySingletonFactory.getInstance(MetricsWALSource.class);
41 }
42
43 public void finishSync(long time) {
44 source.incrementSyncTime(time);
45 }
46
47 public void finishAppend(long time, long size) {
48
49 source.incrementAppendCount();
50 source.incrementAppendTime(time);
51 source.incrementAppendSize(size);
52
53 if (time > 1000) {
54 source.incrementSlowAppendCount();
55 LOG.warn(String.format("%s took %d ms appending an edit to hlog; len~=%s",
56 Thread.currentThread().getName(),
57 time,
58 StringUtils.humanReadableInt(size)));
59 }
60 }
61 }