Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4021#issuecomment-76543201
> Actually, we won't leak accumulators on executors because we clear the
thread-local between tasks.
At this point, I should have spotted that it doesn't make sense to store
WeakReferences if those references are going to be destroyed at the end of
tasks anyways.
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