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https://issues.apache.org/jira/browse/SPARK-13281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15142453#comment-15142453
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Sean Owen commented on SPARK-13281:
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I think that's fine. Better to fail fast. Any other places where we just warn
on an operation that's inherently invalid could use a similar treatment
> Switch broadcast of RDD to exception from warning
> -------------------------------------------------
>
> Key: SPARK-13281
> URL: https://issues.apache.org/jira/browse/SPARK-13281
> Project: Spark
> Issue Type: Improvement
> Reporter: holdenk
> Priority: Trivial
>
> In the comments we log a warning when a user tries to broadcast an RDD for
> compatibility with old programs which may have broadcast RDDs without using
> the resulting broadcast variable. Since we're moving to 2.0 it seems like now
> would be a good opportunity to replace that warning with an exception rather
> than depend on the developer finding the warning message.
> Related to https://issues.apache.org/jira/browse/SPARK-5063
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