Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/1391#issuecomment-48836527
correction: (and that is NOT very high as a fraction).
Tying on phones can suck :-)
To add to Sean's point: we definitely need to estimate this better.
I want to ensure we do that on the right parameters to minimize memory
waste while giving good out of the box behaviour
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