spark MapOutputCommitMessage 源码
spark MapOutputCommitMessage 代码
文件路径：/core/src/main/java/org/apache/spark/shuffle/api/metadata/MapOutputCommitMessage.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.api.metadata;
import java.util.Optional;
import org.apache.spark.annotation.Private;
/**
* :: Private ::
* Represents the result of writing map outputs for a shuffle map task.
* <p>
* Partition lengths represents the length of each block written in the map task. This can
* be used for downstream readers to allocate resources, such as in-memory buffers.
* <p>
* Map output writers can choose to attach arbitrary metadata tags to register with a
* shuffle output tracker (a module that is currently yet to be built in a future
* iteration of the shuffle storage APIs).
*/
@Private
public final class MapOutputCommitMessage {
private final long[] partitionLengths;
private final Optional<MapOutputMetadata> mapOutputMetadata;
private MapOutputCommitMessage(
long[] partitionLengths, Optional<MapOutputMetadata> mapOutputMetadata) {
this.partitionLengths = partitionLengths;
this.mapOutputMetadata = mapOutputMetadata;
}
public static MapOutputCommitMessage of(long[] partitionLengths) {
return new MapOutputCommitMessage(partitionLengths, Optional.empty());
}
public static MapOutputCommitMessage of(
long[] partitionLengths, MapOutputMetadata mapOutputMetadata) {
return new MapOutputCommitMessage(partitionLengths, Optional.of(mapOutputMetadata));
}
public long[] getPartitionLengths() {
return partitionLengths;
}
public Optional<MapOutputMetadata> getMapOutputMetadata() {
return mapOutputMetadata;
}
}
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