aliehsaeedii commented on PR #23065:
URL: https://github.com/apache/kafka/pull/23065#issuecomment-5253951237
Thanks for picking this up — I'm closing this in favour of #23075.
Note that this ticket was already assigned to me and actively in progress,
so please check the assignee and comment before opening a PR next time.
The substantive issue: 4.3 has the dsl.store.format config but not the
headers-aware suppress buffer, so both sides tag records V3 while writing
different layouts — meaning a downgrade mismatch is silently misread, not
rejected, and "rejoins, processes, closes cleanly" won't catch it. That plus
the Ducktape test never having been run is why I'm taking it from here; #23075
adds an explicit restore-rejection check and is green on both directions.
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