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https://issues.apache.org/jira/browse/SPARK-573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-573:
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Component/s: Spark Core
> Clarify semantics of the parallelized closures
> ----------------------------------------------
>
> Key: SPARK-573
> URL: https://issues.apache.org/jira/browse/SPARK-573
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: tjhunter
>
> I do not think there is any guideline about which features of scala are
> allowed/forbidden in the closure that gets sent to the remote nodes. Two
> examples I have are a return statement and updating mutable variables of
> singletons.
> Ideally, a compiler plugin could give an error at compile time, but a good
> error message at run time would be good also.
> Are there any other cases that should not be allowed?
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