Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/4835#issuecomment-76548024
I still think that we should investigate / add that assertion, since
correctness of accumulators relies on the assumption that a deserialized task
has only one instance of an an accumulator with a given id, but it looks like
this issue existed prior to this recent WeakReference change; I'll roll back my
new assertion and follow up on that issue in a separate patch.
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