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https://issues.apache.org/jira/browse/KAFKA-3802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15364439#comment-15364439
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ASF GitHub Bot commented on KAFKA-3802:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1497
> log mtimes reset on broker restart
> ----------------------------------
>
> Key: KAFKA-3802
> URL: https://issues.apache.org/jira/browse/KAFKA-3802
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.9.0.1
> Reporter: Andrew Otto
> Fix For: 0.10.0.1
>
>
> Folks over in
> http://mail-archives.apache.org/mod_mbox/kafka-users/201605.mbox/%3CCAO8=cz0ragjad1acx4geqcwj+rkd1gmdavkjwytwthkszfg...@mail.gmail.com%3E
> are commenting about this issue.
> In 0.9, any data log file that was on
> disk before the broker has it's mtime modified to the time of the broker
> restart.
> This causes problems with log retention, as all the files then look like
> they contain recent data to kafka. We use the default log retention of 7
> days, but if all the files are touched at the same time, this can cause us
> to retain up to 2 weeks of log data, which can fill up our disks.
> This happens *most* of the time, but seemingly not all. We have seen broker
> restarts where mtimes were not changed.
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