Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4234#issuecomment-72004495
@ankurdave Hm, so I looked again and quickly realized the things being
cached are `Graph`s, and they consist of several RDDs. It's possible to add
several `count()` methods for vertices and edges. There could be a generic
`materialize()` method which internally counts. Both add an API method to an
`abstract` class here. That works although might be viewed as overkill? or just
what has to be done? wanted to check before I take a shot at it. This may be
outside my expertise as I haven't worked with graphx.
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