spark MigratableResolver 源码
spark MigratableResolver 代码
文件路径：/core/src/main/scala/org/apache/spark/shuffle/MigratableResolver.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.annotation.{Experimental, Since}
import org.apache.spark.network.buffer.ManagedBuffer
import org.apache.spark.network.client.StreamCallbackWithID
import org.apache.spark.serializer.SerializerManager
import org.apache.spark.storage.BlockId
/**
* :: Experimental ::
* An experimental trait to allow Spark to migrate shuffle blocks.
*/
@Experimental
@Since("3.1.0")
trait MigratableResolver {
/**
* Get the shuffle ids that are stored locally. Used for block migrations.
*/
def getStoredShuffles(): Seq[ShuffleBlockInfo]
/**
* Write a provided shuffle block as a stream. Used for block migrations.
* Up to the implementation to support STORAGE_REMOTE_SHUFFLE_MAX_DISK
*/
def putShuffleBlockAsStream(blockId: BlockId, serializerManager: SerializerManager):
StreamCallbackWithID
/**
* Get the blocks for migration for a particular shuffle and map.
*/
def getMigrationBlocks(shuffleBlockInfo: ShuffleBlockInfo): List[(BlockId, ManagedBuffer)]
}
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