Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/4887#issuecomment-77295859
@andrewor14 , i thinks is not duplicate.
Put a memory_and_disk level block.
1) Try to put in memory store, unroll fails. 2) Put into disk success. 3)
return values through get(blockID).
SPARK-6156 is aim to resolve not try to cache block again in process 3
SPARK-6157 is aim to resolve that situation that have two RDD cache in one
Stage, both tow RDD storage level is memory_and_disk.
first RDD(large), put memory unroll fails, then put disk success, it will
hold an "unroll memory" part.
second RDD(small), also want to put in memory, but may first RDD hold its
unroll memory(may large), then second RDD cant put in memory again, may it in
actually could.
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