Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/925#issuecomment-123213630
In the master, I only serialize the user-defined accumulators but not the
Flink accumulators. As of this pull request, the accumulators are always
serialized even in local setups. Starting multiple actor systems did not solve
the problem because Akka always optimizes message passing in local one VM
setups, i.e. it does not serialize objects even across actor systems.
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