Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1056#discussion_r14864917
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/BlockManagerMasterActor.scala ---
    @@ -129,7 +128,7 @@ class BlockManagerMasterActor(val isLocal: Boolean, 
conf: SparkConf, listenerBus
         case ExpireDeadHosts =>
           expireDeadHosts()
     
    -    case HeartBeat(blockManagerId) =>
    +    case BlockManagerHeartbeat(blockManagerId) =>
    --- End diff --
    
    It seems that this is no longer an actual heartbeat, i.e. we used to 
receive this from executors, but now we receive this from the driver to check 
whether this block manager exists.


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