spark ShuffleBlockResolver 源码
spark ShuffleBlockResolver 代码
文件路径：/core/src/main/scala/org/apache/spark/shuffle/ShuffleBlockResolver.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 org.apache.spark.network.buffer.ManagedBuffer
import org.apache.spark.network.shuffle.MergedBlockMeta
import org.apache.spark.storage.{BlockId, ShuffleMergedBlockId}
private[spark]
/**
* Implementers of this trait understand how to retrieve block data for a logical shuffle block
* identifier (i.e. map, reduce, and shuffle). Implementations may use files or file segments to
* encapsulate shuffle data. This is used by the BlockStore to abstract over different shuffle
* implementations when shuffle data is retrieved.
*/
trait ShuffleBlockResolver {
type ShuffleId = Int
/**
* Retrieve the data for the specified block.
*
* When the dirs parameter is None then use the disk manager's local directories. Otherwise,
* read from the specified directories.
*
* If the data for that block is not available, throws an unspecified exception.
*/
def getBlockData(blockId: BlockId, dirs: Option[Array[String]] = None): ManagedBuffer
/**
* Retrieve a list of BlockIds for a given shuffle map. Used to delete shuffle files
* from the external shuffle service after the associated executor has been removed.
*/
def getBlocksForShuffle(shuffleId: Int, mapId: Long): Seq[BlockId] = {
Seq.empty
}
/**
* Retrieve the data for the specified merged shuffle block as multiple chunks.
*/
def getMergedBlockData(
blockId: ShuffleMergedBlockId,
dirs: Option[Array[String]]): Seq[ManagedBuffer]
/**
* Retrieve the meta data for the specified merged shuffle block.
*/
def getMergedBlockMeta(
blockId: ShuffleMergedBlockId,
dirs: Option[Array[String]]): MergedBlockMeta
def stop(): Unit
}
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