Github user tillrohrmann commented on the pull request:
https://github.com/apache/flink/pull/925#issuecomment-123212399
Is it bad that the accumulators are not serialized in a local setup? If not
and you only want to test the serialization in a distributed setting, then you
can also simply start the testing cluster with multiple `ActorSystems`. This
should enforce serialization, if I'm not mistaken.
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