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

David J. M. Karlsen (JIRA) noreply-jira at qos.ch
Tue Jan 10 14:47:26 CET 2012

    [ http://jira.qos.ch/browse/LBCLASSIC-317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12344#action_12344 ] 

David J. M. Karlsen commented on LBCLASSIC-317:

And my assumptions about performance is from the page:
which says "Given that ReconfigureOnChangeFilter is invoked every time any logger is invoked, the filter is performance critical. In order to improve performance, instead of checking whether to scan or not on every logger invocation, ReconfigureOnChangeFilter is in reality "alive" only once every 16 logging operations. In short, when a configuration file changes, it will be automatically reloaded after a delay determined by the scanning period and several logger invocations. "

> 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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