hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/LogRoller.java

   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 package org.apache.hadoop.hbase.regionserver;
  20
  21 import java.util.List;
  22 import java.util.Map;
  23
  24 import org.apache.hadoop.hbase.wal.AbstractWALRoller;
  25 import org.apache.hadoop.hbase.wal.WAL;
  26 import org.apache.yetus.audience.InterfaceAudience;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 /**
  31  * Runs periodically to determine if the WAL should be rolled.
  32  *
  33  * NOTE: This class extends Thread rather than Chore because the sleep time
  34  * can be interrupted when there is something to do, rather than the Chore
  35  * sleep time which is invariant.
  36  *
  37  * TODO: change to a pool of threads
  38  */
  39 @InterfaceAudience.Private
  40 public class LogRoller extends AbstractWALRoller<RegionServerServices> {
  41   private static final Logger LOG = LoggerFactory.getLogger(LogRoller.class);
  42
  43   public LogRoller(RegionServerServices services) {
  44     super("LogRoller", services.getConfiguration(), services);
  45   }
  46
  47   protected void scheduleFlush(String encodedRegionName, List<byte[]> families) {
  48     RegionServerServices services = this.abortable;
  49     HRegion r = (HRegion) services.getRegion(encodedRegionName);
  50     if (r == null) {
  51       LOG.warn("Failed to schedule flush of {}, because it is not online on us", encodedRegionName);
  52       return;
  53     }
  54     FlushRequester requester = services.getFlushRequester();
  55     if (requester == null) {
  56       LOG.warn("Failed to schedule flush of {}, region={}, because FlushRequester is null",
  57         encodedRegionName, r);
  58       return;
  59     }
  60     // flush specified stores to clean old logs
  61     requester.requestFlush(r, families, FlushLifeCycleTracker.DUMMY);
  62   }
  63
  64   Map<WAL, RollController> getWalNeedsRoll() {
  65     return this.wals;
  66   }
  67 }