Github user mccheah commented on the pull request:

    https://github.com/apache/spark/pull/8007#issuecomment-131915844
  
    Got it - was hoping GetExecutorLossReason wouldn't be called more than 
once. That is what's allowing me to clean up the map there.
    
    In general I may have been overly paranoid in this PR to attempt to clean 
up data structures by removing items from maps. I'm not sure what the 
ramifications are of having the maps keep filling up however - presumably that 
would cause problems for really long-running Spark Contexts. If anyone has any 
better suggestions on cleanup logic, that would be appreciated.


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