Parkerhiphop opened a new pull request, #21470:
URL: https://github.com/apache/kafka/pull/21470
### Background
Currently, when a broker receives a `LeaderAndIsrRequest` for a partition it
does not yet host—most commonly during a partition reassignment or new topic
creation—it logs a high-severity ERROR message:
`ERROR [Broker id=$brokerId] Expected partition $tp with topic id $topicId
to exist, but it was missing. Creating...`
This message is misleading to operators as it implies a state of
inconsistency or data loss ("missing," "expected to exist"), when in fact the
behavior is a normal part of the partition lifecycle. During a move, the
destination broker is expected not to have the partition locally until the
transition begins.
### Changes:
1. Downgraded the log level from ERROR to INFO.
2. Updated the message string to focus on the action ("initializing") rather
than the "missing" state.
3. The new message is meant to neutral and accurately describes both
partition reassignment and initial topic creation scenarios.
### Impact:
Reduces "log noise" and prevents false-positive alerts in monitoring systems
that trigger on ERROR strings in the state.change.logger.
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