Github user harishreedharan commented on the pull request:
https://github.com/apache/spark/pull/8881#issuecomment-142656310
Looking at it again, @srowen is right. Returning `None` makes
`getOrCompute` think that no RDDs have been generated for a given time
(artifact of the fact that `None` is returned when a map has no value for a
key). So this really is case of returning an empty RDD from your function.
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