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.wal;
019
020import java.io.IOException;
021import java.io.InterruptedIOException;
022import java.util.ArrayList;
023import java.util.List;
024import java.util.Map;
025import java.util.concurrent.ConcurrentHashMap;
026import java.util.concurrent.ConcurrentMap;
027import java.util.concurrent.ExecutionException;
028import java.util.concurrent.Future;
029import java.util.concurrent.atomic.AtomicInteger;
030import org.apache.hadoop.fs.Path;
031import org.apache.hadoop.hbase.util.Bytes;
032import org.apache.hadoop.io.MultipleIOException;
033import org.apache.yetus.audience.InterfaceAudience;
034import org.slf4j.Logger;
035import org.slf4j.LoggerFactory;
036
037/**
038 * Class that manages the output streams from the log splitting process. Every region may have many
039 * recovered edits file. But the opening writers is bounded. Bounded means the output streams will
040 * be no more than the size of threadpool.
041 */
042@InterfaceAudience.Private
043class BoundedRecoveredEditsOutputSink extends AbstractRecoveredEditsOutputSink {
044  private static final Logger LOG = LoggerFactory.getLogger(BoundedRecoveredEditsOutputSink.class);
045
046  // Since the splitting process may create multiple output files, we need a map
047  // to track the output count of each region.
048  private ConcurrentMap<String, Long> regionEditsWrittenMap = new ConcurrentHashMap<>();
049  // Need a counter to track the opening writers.
050  private final AtomicInteger openingWritersNum = new AtomicInteger(0);
051
052  public BoundedRecoveredEditsOutputSink(WALSplitter walSplitter,
053    WALSplitter.PipelineController controller, EntryBuffers entryBuffers, int numWriters) {
054    super(walSplitter, controller, entryBuffers, numWriters);
055  }
056
057  @Override
058  public void append(EntryBuffers.RegionEntryBuffer buffer) throws IOException {
059    List<WAL.Entry> entries = buffer.entries;
060    if (entries.isEmpty()) {
061      LOG.warn("got an empty buffer, skipping");
062      return;
063    }
064    // The key point is create a new writer, write edits then close writer.
065    RecoveredEditsWriter writer = createRecoveredEditsWriter(buffer.tableName,
066      buffer.encodedRegionName, entries.get(0).getKey().getSequenceId());
067    if (writer != null) {
068      openingWritersNum.incrementAndGet();
069      writer.writeRegionEntries(entries);
070      regionEditsWrittenMap.compute(Bytes.toString(buffer.encodedRegionName),
071        (k, v) -> v == null ? writer.editsWritten : v + writer.editsWritten);
072      List<IOException> thrown = new ArrayList<>();
073      Path dst = closeRecoveredEditsWriter(writer, thrown);
074      splits.add(dst);
075      openingWritersNum.decrementAndGet();
076      if (!thrown.isEmpty()) {
077        throw MultipleIOException.createIOException(thrown);
078      }
079    }
080  }
081
082  @Override
083  public List<Path> close() throws IOException {
084    boolean isSuccessful = true;
085    try {
086      isSuccessful = finishWriterThreads(false);
087    } finally {
088      isSuccessful &= writeRemainingEntryBuffers();
089    }
090    return isSuccessful ? splits : null;
091  }
092
093  /**
094   * Write out the remaining RegionEntryBuffers and close the writers.
095   * @return true when there is no error.
096   */
097  private boolean writeRemainingEntryBuffers() throws IOException {
098    for (EntryBuffers.RegionEntryBuffer buffer : entryBuffers.buffers.values()) {
099      closeCompletionService.submit(() -> {
100        append(buffer);
101        return null;
102      });
103    }
104    boolean progressFailed = false;
105    try {
106      for (int i = 0, n = entryBuffers.buffers.size(); i < n; i++) {
107        Future<Void> future = closeCompletionService.take();
108        future.get();
109        if (!progressFailed && reporter != null && !reporter.progress()) {
110          progressFailed = true;
111        }
112      }
113    } catch (InterruptedException e) {
114      IOException iie = new InterruptedIOException();
115      iie.initCause(e);
116      throw iie;
117    } catch (ExecutionException e) {
118      throw new IOException(e.getCause());
119    } finally {
120      closeThreadPool.shutdownNow();
121    }
122    return !progressFailed;
123  }
124
125  @Override
126  public Map<String, Long> getOutputCounts() {
127    return regionEditsWrittenMap;
128  }
129
130  @Override
131  public int getNumberOfRecoveredRegions() {
132    return regionEditsWrittenMap.size();
133  }
134
135  @Override
136  public int getNumOpenWriters() {
137    return openingWritersNum.get();
138  }
139}