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http://jira.qos.ch/browse/LBCLASSIC-316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ceki Gulcu reassigned LBCLASSIC-316:
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Assignee: Ceki Gulcu (was: Logback dev list)
> SiftingAppender and the lifecycle of created appenders
> ------------------------------------------------------
>
> Key: LBCLASSIC-316
> URL: http://jira.qos.ch/browse/LBCLASSIC-316
> Project: logback-classic
> Issue Type: Improvement
> Components: appender
> Affects Versions: 1.0.0
> Environment: servlet container
> Reporter: Guus Bloemsma
> Assignee: Ceki Gulcu
>
> I'm using SiftingAppender to create logfiles per servlet request. I wrote a
> servlet filter to add session and request id's into MDC. A custom appender
> (nested into SiftingAppender) buffers all logging events. Only when a WARN or
> ERROR occurred it writes all of them at the end of the servlet request to yet
> another nested appender. Logback made this surprisingly easy!
> This all works fine except for one little problem. The SiftingAppender
> creates a new custom appender for each request. It uses a AppenderTrackerImpl
> to keep track of them. That AppenderTrackerImpl holds on to those appenders
> for half an hour even though it is guaranteed that they won't be needed after
> the request. That is a lot of unused appenders!
> Being able to configure that timeout per SiftingAppender would be one
> solution.
> Another way would be to make the method
> ch.qos.logback.core.sift.AppenderTrackerImpl.isEntryStale(Entry, long) check
> whether the appender in the entry is stopped. In that case it should be
> treated as stale as well. My custom appender would simply stop itself once it
> is no longer used.
> BTW, I understand that I'm kind of abusing SiftingAppender. Maybe I should
> just make my own...
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