Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/855#issuecomment-43917369
Why would you want to cleanup checkpoint data automatically since it is an
explicit user action ?
It can be used to persist computations between spark invocations.
I can see the need for adding the need to register to remove a checkpoint
when it can be safely gc'ed - but note that this need not happen (since gc need
not finish when called before app exit) which is same as this PR.
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