Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/4167#issuecomment-72139397
Hi TD, AFAIK StorageLevel `MEMORY_AND_DISK_SER` has no difference to
`MEMORY_ONLY_SER` if memory is enough, BM will only put data into memory, and
only spill to disk when memory is not enough.
Besides all the receiver's default storage level is
`MEMORY_AND_DISK_SER_2`, if performance is the first consideration, why not
`MEMORY_ONLY_SER_2`?
Actually the behavior of `DISK` will only be triggered when memory is not
enough, so I think for normal case, the performance should be same to
`MEMORY_ONLY_SER`
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