Github user harishreedharan commented on the pull request:

    https://github.com/apache/spark/pull/6508#issuecomment-106965307
  
    Offline discussion with @vanzin - why go to executor to get the info when 
we could get it from the driver?
    
    The reason I went with this approach was that `getBlockStatus` API in 
`BlockManagerMaster` suggests that the driver may not have the state of blocks 
on an executor(see: 
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/storage/BlockManagerMaster.scala#L157).
 If that API can be reliably used it might be better to just use that than talk 
to the executors. Anyone knows why that API may not return the block status of 
all blocks? 


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