spark LocalDiskSingleSpillMapOutputWriter 源码
spark LocalDiskSingleSpillMapOutputWriter 代码
文件路径：/core/src/main/java/org/apache/spark/shuffle/sort/io/LocalDiskSingleSpillMapOutputWriter.java
/*
* 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.spark.shuffle.sort.io;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import org.apache.spark.shuffle.IndexShuffleBlockResolver;
import org.apache.spark.shuffle.api.SingleSpillShuffleMapOutputWriter;
import org.apache.spark.util.Utils;
public class LocalDiskSingleSpillMapOutputWriter
implements SingleSpillShuffleMapOutputWriter {
private final int shuffleId;
private final long mapId;
private final IndexShuffleBlockResolver blockResolver;
public LocalDiskSingleSpillMapOutputWriter(
int shuffleId,
long mapId,
IndexShuffleBlockResolver blockResolver) {
this.shuffleId = shuffleId;
this.mapId = mapId;
this.blockResolver = blockResolver;
}
@Override
public void transferMapSpillFile(
File mapSpillFile,
long[] partitionLengths,
long[] checksums) throws IOException {
// The map spill file already has the proper format, and it contains all of the partition data.
// So just transfer it directly to the destination without any merging.
File outputFile = blockResolver.getDataFile(shuffleId, mapId);
File tempFile = Utils.tempFileWith(outputFile);
Files.move(mapSpillFile.toPath(), tempFile.toPath());
blockResolver
.writeMetadataFileAndCommit(shuffleId, mapId, partitionLengths, checksums, tempFile);
}
}
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