Github user tdas commented on the pull request: https://github.com/apache/spark/pull/11143#issuecomment-182136221 @markgrover What is the compatibility story of Kafka 0.8 and 0.9 with existing Kafka installations? If Kafka 0.9 client API is not supposed to back compatible with Kafka 0.8 installations, then upgrading SS to use 0.9 is not a good idea.
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