| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.mapreduce.task.reduce; |
| |
| import java.io.InputStream; |
| import java.io.IOException; |
| |
| import java.util.Comparator; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import org.apache.hadoop.mapred.Reporter; |
| |
| import org.apache.hadoop.mapreduce.TaskAttemptID; |
| |
| @InterfaceAudience.LimitedPrivate({"MapReduce"}) |
| @InterfaceStability.Unstable |
| public abstract class MapOutput<K, V> { |
| private static AtomicInteger ID = new AtomicInteger(0); |
| |
| private final int id; |
| private final TaskAttemptID mapId; |
| private final long size; |
| private final boolean primaryMapOutput; |
| |
| public MapOutput(TaskAttemptID mapId, long size, boolean primaryMapOutput) { |
| this.id = ID.incrementAndGet(); |
| this.mapId = mapId; |
| this.size = size; |
| this.primaryMapOutput = primaryMapOutput; |
| } |
| |
| public boolean isPrimaryMapOutput() { |
| return primaryMapOutput; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj instanceof MapOutput) { |
| return id == ((MapOutput)obj).id; |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return id; |
| } |
| |
| public TaskAttemptID getMapId() { |
| return mapId; |
| } |
| |
| public long getSize() { |
| return size; |
| } |
| |
| public abstract void shuffle(MapHost host, InputStream input, |
| long compressedLength, |
| long decompressedLength, |
| ShuffleClientMetrics metrics, |
| Reporter reporter) throws IOException; |
| |
| public abstract void commit() throws IOException; |
| |
| public abstract void abort(); |
| |
| public abstract String getDescription(); |
| |
| public String toString() { |
| return "MapOutput(" + mapId + ", " + getDescription() + ")"; |
| } |
| |
| public static class MapOutputComparator<K, V> |
| implements Comparator<MapOutput<K, V>> { |
| public int compare(MapOutput<K, V> o1, MapOutput<K, V> o2) { |
| if (o1.id == o2.id) { |
| return 0; |
| } |
| |
| if (o1.size < o2.size) { |
| return -1; |
| } else if (o1.size > o2.size) { |
| return 1; |
| } |
| |
| if (o1.id < o2.id) { |
| return -1; |
| } else { |
| return 1; |
| |
| } |
| } |
| } |
| |
| } |