spark TorrentBroadcastFactory 源码

2022-10-20
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spark TorrentBroadcastFactory 代码

文件路径：/core/src/main/scala/org/apache/spark/broadcast/TorrentBroadcastFactory.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.broadcast

import scala.reflect.ClassTag

import org.apache.spark.SparkConf

/**
 * A [[org.apache.spark.broadcast.Broadcast]] implementation that uses a BitTorrent-like
 * protocol to do a distributed transfer of the broadcasted data to the executors. Refer to
 * [[org.apache.spark.broadcast.TorrentBroadcast]] for more details.
 */
private[spark] class TorrentBroadcastFactory extends BroadcastFactory {

  override def initialize(isDriver: Boolean, conf: SparkConf): Unit = { }

  override def newBroadcast[T: ClassTag](
      value_ : T,
      isLocal: Boolean,
      id: Long,
      serializedOnly: Boolean = false): Broadcast[T] = {
    new TorrentBroadcast[T](value_, id, serializedOnly)
  }

  override def stop(): Unit = { }

  /**
   * Remove all persisted state associated with the torrent broadcast with the given ID.
   * @param removeFromDriver Whether to remove state from the driver.
   * @param blocking Whether to block until unbroadcasted
   */
  override def unbroadcast(id: Long, removeFromDriver: Boolean, blocking: Boolean): Unit = {
    TorrentBroadcast.unpersist(id, removeFromDriver, blocking)
  }
}

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