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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  package org.apache.hadoop.hbase.master.cleaner;
19  
20  import org.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  import org.apache.hadoop.classification.InterfaceAudience;
23  import org.apache.hadoop.conf.Configuration;
24  import org.apache.hadoop.fs.FileStatus;
25  import org.apache.hadoop.hbase.HBaseInterfaceAudience;
26  import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
27  
28  /**
29   * HFile cleaner that uses the timestamp of the hfile to determine if it should be deleted. By
30   * default they are allowed to live for {@value #DEFAULT_TTL}
31   */
32  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
33  public class TimeToLiveHFileCleaner extends BaseHFileCleanerDelegate {
34  
35    public static final Log LOG = LogFactory.getLog(TimeToLiveHFileCleaner.class.getName());
36    public static final String TTL_CONF_KEY = "hbase.master.hfilecleaner.ttl";
37    // default ttl = 5 minutes
38    public static final long DEFAULT_TTL = 60000 * 5;
39    // Configured time a hfile can be kept after it was moved to the archive
40    private long ttl;
41  
42    @Override
43    public void setConf(Configuration conf) {
44      this.ttl = conf.getLong(TTL_CONF_KEY, DEFAULT_TTL);
45      super.setConf(conf);
46    }
47  
48    @Override
49    public boolean isFileDeletable(FileStatus fStat) {
50      long currentTime = EnvironmentEdgeManager.currentTime();
51      long time = fStat.getModificationTime();
52      long life = currentTime - time;
53      if (LOG.isTraceEnabled()) {
54        LOG.trace("HFile life:" + life + ", ttl:" + ttl + ", current:" + currentTime + ", from: "
55            + time);
56      }
57      if (life < 0) {
58        LOG.warn("Found a hfile (" + fStat.getPath() + ") newer than current time (" + currentTime
59            + " < " + time + "), probably a clock skew");
60        return false;
61      }
62      return life > ttl;
63    }
64  }