MINOR: Note that formatted storage directories are not forward-compatible#22429
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chia7712 merged 1 commit intoJun 7, 2026
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Follow-up to #20707, which unified bootstrap metadata into the KRaft
zero checkpoint. As a side effect, a directory produced by a newer
kafka-storagetool can no longer be started by an older Kafka broker —even if
--release-versionwas set to an older version at format time.The flag only chooses the initial feature levels; the on-disk checkpoint
layout itself is dictated by the tool's own code version.
Reviewers: Chia-Ping Tsai chia7712@gmail.com