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From mateiz <...@git.apache.org>
Subject [GitHub] spark pull request: (WIP) SPARK-2045 Sort-based shuffle
Date Fri, 25 Jul 2014 07:17:27 GMT
Github user mateiz commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1499#discussion_r15388684
  
    --- Diff: core/src/main/scala/org/apache/spark/shuffle/sort/SortShuffleManager.scala ---
    @@ -0,0 +1,80 @@
    +/*
    + * 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.sort
    +
    +import java.io.{DataInputStream, FileInputStream}
    +
    +import org.apache.spark.shuffle._
    +import org.apache.spark.{TaskContext, ShuffleDependency}
    +import org.apache.spark.shuffle.hash.HashShuffleReader
    +import org.apache.spark.storage.{DiskBlockManager, FileSegment, ShuffleBlockId}
    +
    +private[spark] class SortShuffleManager extends ShuffleManager {
    +  /**
    +   * 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] = {
    +    // We currently use the same block store shuffle fetcher as the hash-based shuffle.
    +    new HashShuffleReader(
    +      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 SortShuffleWriter(handle.asInstanceOf[BaseShuffleHandle[K, V, _]], mapId, context)
    +  }
    +
    +  /** Remove a shuffle's metadata from the ShuffleManager. */
    +  override def unregisterShuffle(shuffleId: Int): Unit = {}
    --- End diff --
    
    Alright, fixed this in the latest commit.


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