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/*
* 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.hash
import org.apache.spark._
import org.apache.spark.shuffle._
/**
* A ShuffleManager using hashing, that creates one output file per reduce partition on each
* mapper (possibly reusing these across waves of tasks).
*/
private[spark] class HashShuffleManager(conf: SparkConf) extends ShuffleManager with Logging {
if (!conf.getBoolean("spark.shuffle.spill", true)) {
logWarning(
"spark.shuffle.spill was set to false, but this configuration is ignored as of Spark 1.6+." +
" Shuffle will continue to spill to disk when necessary.")
}
private val fileShuffleBlockResolver = new FileShuffleBlockResolver(conf)
override val shortName: String = "hash"
/* Register a shuffle with the manager and obtain a handle for it to pass to tasks. */
override def registerShuffle[K, V, C](
shuffleId: Int,
numMaps: Int,
dependency: ShuffleDependency[K, V, C]): ShuffleHandle = {
new BaseShuffleHandle(shuffleId, numMaps, dependency)
}
/**
* Get a reader for a range of reduce partitions (startPartition to endPartition-1, inclusive).
* Called on executors by reduce tasks.
*/
override def getReader[K, C](
handle: ShuffleHandle,
startPartition: Int,
endPartition: Int,
context: TaskContext): ShuffleReader[K, C] = {
new BlockStoreShuffleReader(
handle.asInstanceOf[BaseShuffleHandle[K, _, C]], startPartition, endPartition, context)
}
/** Get a writer for a given partition. Called on executors by map tasks. */
override def getWriter[K, V](handle: ShuffleHandle, mapId: Int, context: TaskContext)
: ShuffleWriter[K, V] = {
new HashShuffleWriter(
shuffleBlockResolver, handle.asInstanceOf[BaseShuffleHandle[K, V, _]], mapId, context)
}
/** Remove a shuffle's metadata from the ShuffleManager. */
override def unregisterShuffle(shuffleId: Int): Boolean = {
shuffleBlockResolver.removeShuffle(shuffleId)
}
override def shuffleBlockResolver: FileShuffleBlockResolver = {
fileShuffleBlockResolver
}
/** Shut down this ShuffleManager. */
override def stop(): Unit = {
shuffleBlockResolver.stop()
}
}
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