Github user willb commented on the pull request:
https://github.com/apache/spark/pull/189#issuecomment-38340085
The Python accumulators still work on master and with the changes from #143
(which serializes the closure at closure cleaning but doesn't use the
serialized value for anything).
As far as I can tell, accumulators in general still work after this change;
at least all of the non-pyspark tests that use accumulators all still work
after this change (I have been re-running `JavaAPISuite`, `AccumulatorSuite`,
`DistributedSuite`, `ReplSuite`, and `AsyncRDDActionsSuite` individually while
experimenting with this).
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