Github user steveblackmon commented on the pull request:
https://github.com/apache/incubator-streams/pull/133#issuecomment-63703331
In general, we need to ensure that all components and outbound datums are
serializable without exception. While it's possible to skirt this in the local
runtime, modules that don't conform are unusable with parallelism > 1 or in any
horizontally scalable runtime.
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