Github user willb commented on the pull request: https://github.com/apache/spark/pull/143#issuecomment-38189119 Thanks for the quick review, @kayousterhout! I think that the current state of the branch addresses all of the concerns you raised; sorry that I had to dig in a little more than I expected to verify how things were working in `DStream`. If anyone has further thoughts about making this a configurable option, please let me know. The approach I'm currently taking to [SPARK-729](https://spark-project.atlassian.net/browse/SPARK-729) depends on serializability checking happening in `ClosureCleaner.clean`, so if we did decide to make this checking optional it would affect when variable capture occurred if the option were disabled (as well as requiring that the serializability check go back in to `DAGScheduler`, at least conditionally, as mentioned above).
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