Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/189#issuecomment-39613507
It's fine to add a commit. Our merge script will rebase your branch and
squash it into a single patch at the end.
For the Python accumulators, it would be good to understand why it
happened. We can leave serializing out of runJob but perhaps we can also modify
the Python accumulator class to fix it.
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