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http://jira.qos.ch/browse/LBCLASSIC-254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ceki Gulcu reassigned LBCLASSIC-254:
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Assignee: Ceki Gulcu (was: Logback dev list)
> Performance improvement for LogbackMDCAdapter
> ---------------------------------------------
>
> Key: LBCLASSIC-254
> URL: http://jira.qos.ch/browse/LBCLASSIC-254
> Project: logback-classic
> Issue Type: Improvement
> Components: Other
> Affects Versions: 0.9.28
> Reporter: Michael Franz
> Assignee: Ceki Gulcu
> Attachments: LogbackMDCAdapter.java
>
>
> During performance analysis of our application the LogbackMDCAdapter showed
> up as a performance hotspot. This is because the application does relatively
> often replaces multiple entries in the MDC at ones, e.g. 6 removes/writes
> without any intermediate log statement. Also actual log messages that come
> through filtering before creating the LoggingEvent are relatively rare in
> production environments.
> I have reworked the implementation to improve the performance. The main idea
> is to defer cloning the internal Map as long possible. This patch increased
> overall application performance by about 10% in that test.
> Other application types were MDC changes are small and many LoggingEvent
> objects are created (calls to getPropertyMap()) should not be affected
> significantly.
> Note: I haven't check if my patch would reintroduce the #LBCLASSIC-183, but
> my subclasses of InheritableThreadLocal does not override the initialValue()
> method, so it could work.
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