001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver.handler;
019
020import java.io.IOException;
021import java.util.concurrent.atomic.AtomicInteger;
022import org.apache.hadoop.hbase.Server;
023import org.apache.hadoop.hbase.ServerName;
024import org.apache.hadoop.hbase.SplitLogCounters;
025import org.apache.hadoop.hbase.SplitLogTask;
026import org.apache.hadoop.hbase.coordination.SplitLogWorkerCoordination;
027import org.apache.hadoop.hbase.executor.EventHandler;
028import org.apache.hadoop.hbase.executor.EventType;
029import org.apache.hadoop.hbase.regionserver.SplitLogWorker.TaskExecutor;
030import org.apache.hadoop.hbase.regionserver.SplitLogWorker.TaskExecutor.Status;
031import org.apache.hadoop.hbase.util.CancelableProgressable;
032import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
033import org.apache.yetus.audience.InterfaceAudience;
034import org.slf4j.Logger;
035import org.slf4j.LoggerFactory;
036
037/**
038 * Handles log splitting a wal Used by the zk-based distributed log splitting. Created by
039 * ZKSplitLogWorkerCoordination.
040 * @deprecated since 2.4.0 and in 3.0.0, to be removed in 4.0.0, replaced by procedure-based
041 *             distributed WAL splitter, see SplitWALManager
042 */
043@Deprecated
044@InterfaceAudience.Private
045public class WALSplitterHandler extends EventHandler {
046  private static final Logger LOG = LoggerFactory.getLogger(WALSplitterHandler.class);
047  private final ServerName serverName;
048  private final CancelableProgressable reporter;
049  private final AtomicInteger inProgressTasks;
050  private final TaskExecutor splitTaskExecutor;
051  private final SplitLogWorkerCoordination.SplitTaskDetails splitTaskDetails;
052  private final SplitLogWorkerCoordination coordination;
053
054  public WALSplitterHandler(final Server server, SplitLogWorkerCoordination coordination,
055    SplitLogWorkerCoordination.SplitTaskDetails splitDetails, CancelableProgressable reporter,
056    AtomicInteger inProgressTasks, TaskExecutor splitTaskExecutor) {
057    super(server, EventType.RS_LOG_REPLAY);
058    this.splitTaskDetails = splitDetails;
059    this.coordination = coordination;
060    this.reporter = reporter;
061    this.inProgressTasks = inProgressTasks;
062    this.inProgressTasks.incrementAndGet();
063    this.serverName = server.getServerName();
064    this.splitTaskExecutor = splitTaskExecutor;
065  }
066
067  @Override
068  public void process() throws IOException {
069    long startTime = EnvironmentEdgeManager.currentTime();
070    Status status = null;
071    try {
072      status = this.splitTaskExecutor.exec(splitTaskDetails.getWALFile(), reporter);
073      switch (status) {
074        case DONE:
075          coordination.endTask(new SplitLogTask.Done(this.serverName),
076            SplitLogCounters.tot_wkr_task_done, splitTaskDetails);
077          break;
078        case PREEMPTED:
079          SplitLogCounters.tot_wkr_preempt_task.increment();
080          LOG.warn("task execution preempted " + splitTaskDetails.getWALFile());
081          break;
082        case ERR:
083          if (server != null && !server.isStopped()) {
084            coordination.endTask(new SplitLogTask.Err(this.serverName),
085              SplitLogCounters.tot_wkr_task_err, splitTaskDetails);
086            break;
087          }
088          // if the RS is exiting then there is probably a tons of stuff
089          // that can go wrong. Resign instead of signaling error.
090          // $FALL-THROUGH$
091        case RESIGNED:
092          if (server != null && server.isStopped()) {
093            LOG.info("task execution interrupted because worker is exiting "
094              + splitTaskDetails.toString());
095          }
096          coordination.endTask(new SplitLogTask.Resigned(this.serverName),
097            SplitLogCounters.tot_wkr_task_resigned, splitTaskDetails);
098          break;
099      }
100    } finally {
101      LOG.info("Worker " + serverName + " done with task " + splitTaskDetails.toString() + " in "
102        + (EnvironmentEdgeManager.currentTime() - startTime) + "ms. Status = " + status);
103      this.inProgressTasks.decrementAndGet();
104    }
105  }
106}