Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/3527#issuecomment-65028176
I believe it is only 1 bit, not byte, per block. Further I would estimate
compression on largely uniform data to be at least around 10x. So your
example would ideally only use around 1.2MB.
Anyway, you can arbitrarily multiply the number of partitions to
demonstrate the issue. 1mil by 1mil is still a tough cookie to crack, but
we don't really want users to have to meddle with frame sizes.
Having this check is fine, of course, whether or not users should have to
change it.
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