Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/4293#issuecomment-72509826
Updated patch adds instructions on how to avoid the exception and extends
behavior to `NewHadoopRDD`.
My opinion is still that this deserves an Exception rather than a warning.
It's not a groupByKey kind of situation where there is a more performant choice
- users that cache RDDs in this way face fundamental correctness issues. If
I'm missing legitimate uses for this of course I take it back.
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