Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/7160#issuecomment-117785223
@ilganeli I'm not sure whether this is a safe change. If the old ones are
not deleted from block managers, new RDDs might not be able to cache or have to
downgrade the storage level. Since it is hard to tell when the next caching
happens, we set blocking to true to be safe. It would be great if you can share
some benchmark results, so we can easily see the trade-off and decide.
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