Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3259#issuecomment-63138054
@cristianopris I've updated this so that the TimerTask keeps a
[WeakReference](https://docs.oracle.com/javase/7/docs/api/java/lang/ref/WeakReference.html)
to `promise`, which I think should address that source of memory leaks.
Thanks to @andrewor14 for discussing this with me; based on our chat, I've
added several clarifying comments.
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