Github user srowen commented on the issue:
https://github.com/apache/spark/pull/21488
Yes, good argument. Having been burned in the past (actually, by Kafka and
ZK changes, though that's in the past), I'm aware that even compiling against
version B instead of A, with no library code changes, may still mean the
library no longer runs against version A. Changing exception signatures is also
sometimes a problem.
It may not be the case here, unlikely, but do want to think this through
fully. Yes differences like
https://github.com/apache/kafka/commit/a4c292173618e22b3f99ab8615c6b585c7688a40
are what I am worried about.
Still I have no concrete example of this type of problem in the wild.
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