Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12395#issuecomment-212851362
OK, so there's not actually a hard reason to enforce a minimum of 300MB --
it's not "accidentally" being enforced now. Indeed that's probably too high a
minimum. Hm. At least, we can put back the move of the 300MB constant since it
is really specific to the UnifiedMemoryManager. The classic memory manager path
could enforce a much lower minimum ... 32MB? something below which we think
Spark can't reasonably run and is almost surely an input typo.
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