sort/io/LocalDiskSingleSpillMapOutputWriter.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package org.apache.spark.shuffle.sort.io;
0019
0020 import java.io.File;
0021 import java.io.IOException;
0022 import java.nio.file.Files;
0023
0024 import org.apache.spark.shuffle.IndexShuffleBlockResolver;
0025 import org.apache.spark.shuffle.api.SingleSpillShuffleMapOutputWriter;
0026 import org.apache.spark.util.Utils;
0027
0028 public class LocalDiskSingleSpillMapOutputWriter
0029     implements SingleSpillShuffleMapOutputWriter {
0030
0031   private final int shuffleId;
0032   private final long mapId;
0033   private final IndexShuffleBlockResolver blockResolver;
0034
0035   public LocalDiskSingleSpillMapOutputWriter(
0036       int shuffleId,
0037       long mapId,
0038       IndexShuffleBlockResolver blockResolver) {
0039     this.shuffleId = shuffleId;
0040     this.mapId = mapId;
0041     this.blockResolver = blockResolver;
0042   }
0043
0044   @Override
0045   public void transferMapSpillFile(
0046       File mapSpillFile,
0047       long[] partitionLengths) throws IOException {
0048     // The map spill file already has the proper format, and it contains all of the partition data.
0049     // So just transfer it directly to the destination without any merging.
0050     File outputFile = blockResolver.getDataFile(shuffleId, mapId);
0051     File tempFile = Utils.tempFileWith(outputFile);
0052     Files.move(mapSpillFile.toPath(), tempFile.toPath());
0053     blockResolver.writeIndexFileAndCommit(shuffleId, mapId, partitionLengths, tempFile);
0054   }
0055 }