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

    https://github.com/apache/spark/pull/2944#discussion_r19521370
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/BlockManagerMasterActor.scala ---
    @@ -412,6 +415,17 @@ class BlockManagerMasterActor(val isLocal: Boolean, 
conf: SparkConf, listenerBus
           Seq.empty
         }
       }
    +
    +  private def getActorSystemHostPortForExecutor(executorId: String): 
Option[(String, Int)] = {
    --- End diff --
    
    This verbosely-named method is the big "hack" for enabling driver -> 
executor RPC.  Basically, I needed to have a way to address the remote 
`ExecutorActor` from the driver.  Here, we rely on the fact that every executor 
registers a BlockManager actor with the BlockManagerMasterActor and that there 
is only one actor system per executor / driver.


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