Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1772#issuecomment-51130759
Can we say that the accumulator update will be attemtped at least once? I
think this is the bigger concern for users... then for built-in accumulators we
can guarentee the update succeeds at least once. I suppose if users are writing
business logic around accumulators, they might actually want it to fail
explicitly.
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