Hi, I would like to start the vote for KIP-268:
https://cwiki.apache.org/confluence/display/KAFKA/KIP-268%3A+Simplify+Kafka+Streams+Rebalance+Metadata+Upgrade PR https://github.com/apache/kafka/pull/4636 contains the fixes to upgrade from metadata version 1 to 2. Some tests are still missing but I'll add them asap. For "version probing" including new metadata version 3 I plan to do a follow-up PR after PR-4636 is merged. -Matthias
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