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https://issues.apache.org/jira/browse/LOG4J2-3153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on LOG4J2-3153 started by Carter Kozak.
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> FixedDateFormat performs poorly with a PreciseClock
> ---------------------------------------------------
>
> Key: LOG4J2-3153
> URL: https://issues.apache.org/jira/browse/LOG4J2-3153
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.14.1
> Reporter: Carter Kozak
> Assignee: Carter Kozak
> Priority: Major
>
> Enabling a PreciseClock with microsecond precision (default on jdk9+) results
> in substantially worse performance in DatePatternConverter using a
> FixedDateFormat which doesn't rely on microsecond precision.
> The cached value is invalidated every time the microsecond clock changes.
> This is correct when the clock uses microsecond precision, however many
> configurations (including the default) use only millisecond precision, so we
> can reuse the cached value many times longer.
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