Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/8237#issuecomment-132033574
We have rejected such ideas before because not generating an RDD in a batch
will actually cause problems in semantics of the downstream operations. For
example, if you are doing updateStateByKey with the kafka stream, it is
expected that the updatefunction will be called for each key in each batch
interval. If there is no RDD generated, then its not clear what the semantics
become. So I am against making this change.
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