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https://issues.apache.org/jira/browse/KAFKA-1379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16065471#comment-16065471
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Andrew Olson commented on KAFKA-1379:
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[~hachikuji] Jason, could you confirm if this bug has been fixed? According to
http://kafka.apache.org/documentation.html#upgrade_10_1_breaking it appears so.
> Partition reassignment resets clock for time-based retention
> ------------------------------------------------------------
>
> Key: KAFKA-1379
> URL: https://issues.apache.org/jira/browse/KAFKA-1379
> Project: Kafka
> Issue Type: Bug
> Components: log
> Reporter: Joel Koshy
>
> Since retention is driven off mod-times reassigned partitions will result in
> data that has been on a leader to be retained for another full retention
> cycle. E.g., if retention is seven days and you reassign partitions on the
> sixth day then those partitions will remain on the replicas for another
> seven days.
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