Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/3798#issuecomment-72759859
But of course there can be multiple implementations! For example, there is
both KafkaReceiver and ReliableKafkaReceiver. The second was introduced so that
the code path for existing uses is not disturbed when we are introducing
experimental code paths that are optionally enabled with flags. We never
envisioned that happening, but when it occur, we could do this because the
KafkaReceiver was not exposed, only the Receiver interface was exposed.
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