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https://issues.apache.org/jira/browse/KAFKA-7076?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16517658#comment-16517658
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Dhruvil Shah commented on KAFKA-7076:
-------------------------------------
PR is here: https://github.com/apache/kafka/pull/5254
> Broker startup could be inefficient when using old message format
> -----------------------------------------------------------------
>
> Key: KAFKA-7076
> URL: https://issues.apache.org/jira/browse/KAFKA-7076
> Project: Kafka
> Issue Type: Bug
> Reporter: Dhruvil Shah
> Assignee: Dhruvil Shah
> Priority: Major
>
> During broker startup, we call `Log#recoverSegment` when we find corrupted
> indexes, for segments beyond the last check-pointed recovery point, and for
> any ".swap" segments created by log cleaner. One of the things
> `Log#recoverSegments` does is to build up the producer state, starting from
> any previous snapshot file that is available. For logs using message formats
> older than V2, we could skip building up this producer state which would
> essentially speed up recovery.
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