Github user JoshRosen commented on the pull request:

    https://github.com/apache/spark/pull/4741#issuecomment-75722148
  
    LGTM; this is a good catch.  It looks like this issue is present in the 
1.2.x as well, since there's no`stageIdToActiveJobIds.remove()` call there, 
either.  JobProgressListener has a test that is designed to prevent memory 
leaks in these collections, but it looks like the test trivially passed for 
this collection because it didn't involve a workload that caused the collection 
to be populated in the first place.


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