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Posted to jira@kafka.apache.org by "kevin-wu24 (via GitHub)" <gi...@apache.org> on 2025/09/17 17:04:01 UTC

Re: [PR] KAFKA-18028: the effective kraft version of --no-initial-controllers should be 1 rather than 0 [kafka]

kevin-wu24 commented on PR #17836:
URL: https://github.com/apache/kafka/pull/17836#issuecomment-3303865385

   Hi @chia7712 @FrankYang0529, when a node sets `--no-initial-controllers`, the idea is that the node does not know what kraft.version the cluster should be running. 
   
   Therefore, the flag should be a no-op, and the "effective kraft version" of a node setting this flag should be 0, not 1. The reason for this is because we can format a node with a old MV that does not support kraft.version=1. In this case, setting `--no-initial-controllers` causes formatting to fail, even though it should not.
   
   Filed https://issues.apache.org/jira/browse/KAFKA-19719 to fix.


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