Github user mbonaci commented on the pull request:
https://github.com/apache/spark/pull/11143#issuecomment-190808475
IMHO option 1 is cleaner.
Users who have to postpone upgrading Kafka brokers have the option of using
older versions of Spark.
When Kafka went from 0.8 to 0.9, they did not leave the old high and low
level consumer APIs around just because there are users that use them. If you
want to upgrade to Kafka 0.9 you'll have to refactor your consumer clients to
work with 0.9 API, simple as that.
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