Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/11919#issuecomment-212917172
Yeah by default the factors RDDs are persisted in memory... or if not at
least memory_disk. I guess having that small additional cost and actually
cleaning up the shuffle deps and not ultimately eating all the disk space and
crashing the program, is the lesser of evils :)
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