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https://issues.apache.org/jira/browse/KAFKA-4907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15927231#comment-15927231
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Jiangjie Qin commented on KAFKA-4907:
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[~junrao] Are you referring to the log cleaner? The log cleaner seems using
different method and appends the message directly to the log without going
through the timestamp validation. So it seems not an issue?
> compacted topic shouldn't reject messages with old timestamp
> ------------------------------------------------------------
>
> Key: KAFKA-4907
> URL: https://issues.apache.org/jira/browse/KAFKA-4907
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.10.1.0
> Reporter: Jun Rao
>
> In LogValidator.validateTimestamp(), we check the validity of the timestamp
> in the message without checking whether the topic is compacted or not. This
> can cause messages to a compacted topic to be rejected when it shouldn't.
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