path: root/core/src/main/scala/org/apache/spark/ShuffleFetcher.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

import org.apache.spark.serializer.Serializer

private[spark] abstract class ShuffleFetcher {

  /**
   * Fetch the shuffle outputs for a given ShuffleDependency.
   * @return An iterator over the elements of the fetched shuffle outputs.
   */
  def fetch[T](
      shuffleId: Int,
      reduceId: Int,
      context: TaskContext,
      serializer: Serializer = SparkEnv.get.serializer): Iterator[T]

  /** Stop the fetcher */
  def stop() {}
}