Github user ijuma commented on the issue:
https://github.com/apache/spark/pull/21488
Yes, Kafka clients 0.10.2 and higher support brokers from 0.10.0 and higher
if the protocols being used are available in that version. Since we only
changed test code in this PR, upgrading to 2.0.0 is safe.
If Spark were to use the AdminClient create topics, then the brokers would
have to be 0.10.1 or higher. Other admin protocols like config management were
added in more recent versions and so on.
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