Github user nchammas commented on the pull request:
https://github.com/apache/spark/pull/1082#issuecomment-50351593
Hi folks, Kan asked me to comment here on my use case for this PySpark call
since I reported the [original JIRA
issue](https://issues.apache.org/jira/browse/SPARK-2141).
I actually don't have a strong use case myself, but rather reported the
issue after reading [this Spark User List
discussion](http://apache-spark-user-list.1001560.n3.nabble.com/list-of-persisted-rdds-tt7564.html)
and finding out that the Spark Scala API had this method but the Python API
didn't.
It appears that the desired use case discussed in that thread was for a way
to `unpersist()` all cached RDDs at once.
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