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https://issues.apache.org/jira/browse/KAFKA-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020332#comment-16020332
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ASF GitHub Bot commented on KAFKA-5186:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/3113
> Avoid expensive initialization of producer state when upgrading
> ---------------------------------------------------------------
>
> Key: KAFKA-5186
> URL: https://issues.apache.org/jira/browse/KAFKA-5186
> Project: Kafka
> Issue Type: Sub-task
> Components: clients, core, producer
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Blocker
> Labels: exactly-once
> Fix For: 0.11.0.0
>
>
> Currently the producer state is always loaded upon broker initialization. If
> we don't find a snapshot file to load from, then we scan the log segments
> from the beginning to rebuild the state. Of course, when users upgrade to the
> new version, there will be no snapshot file, so the upgrade could be quite
> intensive. It would be nice to avoid this by assuming instead that the
> absence of a snapshot file means that the producer state should start clean
> and we can avoid the expensive scanning.
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