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Posted to log4j-dev@logging.apache.org by "Remko Popma (JIRA)" <ji...@apache.org> on 2014/09/08 13:34:28 UTC

[jira] [Updated] (LOG4J2-812) Performance optimization: avoid use of synchronized SimpleDateFormat in Dat​ePatternCo​nverter 

     [ https://issues.apache.org/jira/browse/LOG4J2-812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Remko Popma updated LOG4J2-812:
-------------------------------
    Assignee: Remko Popma
     Summary: Performance optimization: avoid use of synchronized SimpleDateFormat in Dat​ePatternCo​nverter   (was: Blocking state: org.apache​.loggin.lo​g4j.core.p​attern.Dat​ePatternCo​nverter )

> Performance optimization: avoid use of synchronized SimpleDateFormat in Dat​ePatternCo​nverter 
> -----------------------------------------------------------------------------------------------
>
>                 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
>            Assignee: Remko Popma
>
> Threads seem to be blocking on class org.apache​.loggin.lo​g4j.core.p​attern.Dat​ePatternCo​nverter. 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:
> -------------
> Ralph Goers ralph.goers@dslextreme.com 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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