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https://issues.apache.org/jira/browse/LOG4J2-2423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carter Kozak closed LOG4J2-2423.
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Resolution: Not A Bug
Closing this out as I misunderstood the functionality.
> Rolled files are not deleted when a date is used in the pattern
> ---------------------------------------------------------------
>
> Key: LOG4J2-2423
> URL: https://issues.apache.org/jira/browse/LOG4J2-2423
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Reporter: Carter Kozak
> Assignee: Carter Kozak
> Priority: Major
>
> In my appender definition I set
> filePattern="app/log/trace.%d\{yyyy-MM-dd}-%i.log.gz"
> I would expect to see a maximum of 7 rolled trace logs, however I have
> accumulated over 30.
> While running in a debugger, in AbstractRolloverStrategy.getEligibleFiles I
> see filePattern set to "trace.2018-08-22-(\d+).log.\*". I would expect the
> date to be replaced to something along the lines of
> "trace.(\d+)\-(\d+)\-(\d+)\-(\d+).log.\*"
> Based on the documentation and javadoc this doesn't appear to be entirely
> unexpected, however it is odd that based on the presence of a date in the
> file pattern a default rolling file appender may create up to 7 total files,
> or up to 7 files per date pattern minimum interval.
> I'm curious if this has been discussed elsewhere that I may have missed, or
> if this is consistent with others expectation of DefaultRolloverStrategy. If
> so I will update the documentation to be clearer around this point.
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