Github user aarondav commented on the pull request: https://github.com/apache/incubator-spark/pull/605#issuecomment-35454755 Ah, got it. I actually didn't realize that StorageLevel.scala is the Scala version, and StorageLevels is the Java version (clear naming scheme we got going there). So from the beginning this was just intended as the Java API to the storage levels. Makes sense, thanks
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