[logback-dev] [JIRA] Resolved: (LBCLASSIC-317) Improve reconfigure performance

Ceki Gulcu (JIRA) noreply-jira at qos.ch
Tue Jan 10 17:32:26 CET 2012

     [ http://jira.qos.ch/browse/LBCLASSIC-317?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ceki Gulcu resolved LBCLASSIC-317.

    Resolution: Won't Fix

For performance reasons, the check to see the required amount of time has elapsed is skipped 15 times out of 16. Only once in 16 times does the code check to see if sufficient time has elapsed before checking the timestamp of the config file. 

> Improve reconfigure performance
> -------------------------------
>                 Key: LBCLASSIC-317
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-317
>             Project: logback-classic
>          Issue Type: Improvement
>          Components: Other
>    Affects Versions: 1.0.0
>         Environment: N/A
>            Reporter: David J. M. Karlsen
>            Assignee: Logback dev list
> Looking at the code http://logback.qos.ch/xref/ch/qos/logback/classic/turbo/ReconfigureOnChangeFilter.html it seems like the reconfigure stuff is checked at every 16th logger use.
> Wouldn't it be better to save the timestamp of the configuration file, and instead of number of invocations, measure the time since last reconfig, and check the delta until "now", and if it has passed, check the file timestamp again if it is newer.
> In a busy application 16 log statements will be called very often, so by using a period of let's say 30 seconds would save a lot of checking?

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