Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/855#issuecomment-43968654
Yes, i agree with @mridulm This should not be done automatically for all
checkpoints, as it is necessary to keep them around across spark invocations.
For example, with Spark Streaming saves intermediate state datasets as
checkpoints and relies on them to recover from driver failures.
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