Carter Kozak created LOG4J2-3153:
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Summary: 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
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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