Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4886#issuecomment-93378547
@suyanNone from the description I'm still not sure I understand why this is
needed. It seems reasonable to try again to put the data into memory, later, if
it is intended to be stored in memory. The call from `CacheManager` now always
skips putting data into memory, since the modified `if` condition becomes
always true because `isDiskToMemory == !level.isMemory`. I think this is not
the right change, based on what I understand.
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