Mohit Anchlia created LOG4J2-812:
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Summary: Blocking state:
org.apache.loggin.log4j.core.pattern.DatePatternConverter
Key: LOG4J2-812
URL: https://issues.apache.org/jira/browse/LOG4J2-812
Project: Log4j 2
Issue Type: Bug
Affects Versions: 2.0.2
Reporter: Mohit Anchlia
Threads seem to be blocking on class
org.apache.loggin.log4j.core.pattern.DatePatternConverter. It's short
lived but is visible in profiler. It also is adding on to CPU. Here is the mail
conversation on the mailing list:
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Ralph Goers [email protected] via logging.apache.org
4:28 PM (10 minutes ago)
to Log4J
The converter uses a SimpleDateFormat which is not thread safe and so is
synchronized. I am sure there might be minor optimizations that could be done
to this
What I would do is modify DatePatternConverter to
a) use Java 8’s java.time.format.DateTimeFormatter if running on Java 8
b) use Joda Time’s DateTimeFormat if it is present.
c) create a pool of SimpleDateFormat objects and use those.
Please create a Jira issue for this.
Ralph
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