spark ShuffleWriter 源码
spark ShuffleWriter 代码
文件路径：/core/src/main/scala/org/apache/spark/shuffle/ShuffleWriter.scala
/*
* 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
import java.io.IOException
import org.apache.spark.scheduler.MapStatus
/**
* Obtained inside a map task to write out records to the shuffle system.
*/
private[spark] abstract class ShuffleWriter[K, V] {
/** Write a sequence of records to this task's output */
@throws[IOException]
def write(records: Iterator[Product2[K, V]]): Unit
/** Close this writer, passing along whether the map completed */
def stop(success: Boolean): Option[MapStatus]
/** Get the lengths of each partition */
def getPartitionLengths(): Array[Long]
}
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