Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12395#issuecomment-213920665
This looks good as a simple guard against typos ("500" instead of "500m")
that are otherwise a little obscure to a new user. It parallels similar checks
in the new memory manager. Although it'd be cleaner if both used `require`,
it's not a big deal.
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