Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/1082#issuecomment-50252530
What's the use-case for just retrieving only the ids of the persistent
RDDs? If you want to check whether a particular RDD has been persisted, you
can use the `getStorageLevel()` method that's already present in both the Java
and Python APIs.
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