spark ShuffleReader 源码
spark ShuffleReader 代码
文件路径：/core/src/main/scala/org/apache/spark/shuffle/ShuffleReader.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
/**
* Obtained inside a reduce task to read combined records from the mappers.
*/
private[spark] trait ShuffleReader[K, C] {
/** Read the combined key-values for this reduce task */
def read(): Iterator[Product2[K, C]]
/**
* Close this reader.
* TODO: Add this back when we make the ShuffleReader a developer API that others can implement
* (at which point this will likely be necessary).
*/
// def stop(): Unit
}
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