[jira] [Resolved] (SPARK-573) Clarify semantics of the parallelized closures

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-573.
-----------------------------
    Resolution: Won't Fix

> 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
>            Priority: Minor
>
> 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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