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From ericl <...@git.apache.org>
Subject [GitHub] spark pull request #13152: [SPARK-15353] [CORE] Making peer selection for bl...
Date Thu, 04 Aug 2016 22:43:38 GMT
Github user ericl commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13152#discussion_r73615717
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/BlockReplicationPrioritization.scala
---
    @@ -0,0 +1,76 @@
    +/*
    + * 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.storage
    +
    +import scala.util.Random
    +
    +import org.apache.spark.annotation.DeveloperApi
    +import org.apache.spark.internal.Logging
    +
    +/**
    + * ::DeveloperApi::
    + * BlockReplicationPrioritization provides logic for prioritizing a sequence of peers
for
    + * replicating blocks
    + */
    +@DeveloperApi
    +trait BlockReplicationPrioritization {
    +
    +  /**
    +   * Method to prioritize a bunch of candidate peers of a block
    +   *
    +   * @param blockManagerId Id of the current BlockManager for self identification
    +   * @param peers A list of peers of a BlockManager
    +   * @param peersReplicatedTo Set of peers already replicated to
    +   * @param blockId BlockId of the block being replicated. This can be used as a source
of
    +   *                randomness if needed.
    +   * @return A prioritized list of peers. Lower the index of a peer, higher its priority
    +   */
    +  def prioritize(blockManagerId: BlockManagerId,
    +    peers: Seq[BlockManagerId],
    +    peersReplicatedTo: Set[BlockManagerId],
    +    blockId: BlockId): Seq[BlockManagerId]
    +}
    +
    +@DeveloperApi
    +class DefaultBlockReplicationPrioritization
    +  extends BlockReplicationPrioritization
    +  with Logging {
    +
    +  /**
    +   * Method to prioritize a bunch of candidate peers of a block. This is a basic implementation,
    +   * that just makes sure we put blocks on different hosts, if possible
    +   *
    +   * @param blockManagerId Id of the current BlockManager for self identification
    +   * @param peers A list of peers of a BlockManager
    +   * @param peersReplicatedTo Set of peers already replicated to
    +   * @param blockId BlockId of the block being replicated. This can be used as a source
of
    +   *                randomness if needed.
    +   * @return A prioritized list of peers. Lower the index of a peer, higher its priority
    +   */
    +  override def prioritize(blockManagerId: BlockManagerId,
    --- End diff --
    
    style


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