Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13152#discussion_r75426300
  
    --- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala 
---
    @@ -160,8 +163,25 @@ private[spark] class BlockManager(
         blockTransferService.init(this)
         shuffleClient.init(appId)
     
    -    blockManagerId = BlockManagerId(
    -      executorId, blockTransferService.hostName, blockTransferService.port)
    +    blockReplicationPrioritizer = {
    +      val priorityClass = conf.get(
    +        "spark.replication.topologyawareness.prioritizer",
    +        "org.apache.spark.storage.DefaultBlockReplicationPrioritization")
    +      val clazz = Utils.classForName(priorityClass)
    +      val ret = 
clazz.newInstance.asInstanceOf[BlockReplicationPrioritization]
    +      logInfo(s"Using $priorityClass for prioritizing peers")
    --- End diff --
    
    ```
    Using $priorityClass for block replication policy
    ```


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