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https://issues.apache.org/jira/browse/LOG4J2-423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma updated LOG4J2-423:
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Attachment: (was: jconsole2.png)
> Provide a means to inspect queue usage for Async Loggers and Async Appender
> ---------------------------------------------------------------------------
>
> Key: LOG4J2-423
> URL: https://issues.apache.org/jira/browse/LOG4J2-423
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders, Core
> Affects Versions: 2.0-beta9
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.0-rc1
>
> Attachments: jconsole1.png, jconsole2.png
>
>
> There are scenarios where logging (even asynchronous logging) can become a
> performance bottleneck for the application; specifically, during a burst of
> activity the application may produce log events faster than the appender can
> consume them. If such a burst continues long enough, the queue that is used
> to pass log events from the producing (application) thread to the consuming
> (appender) thread may fill up.
> Note that the queues used by AsyncLoggers and by AsyncAppenders are both
> bounded queues. Once this queue is full, the producer can only add log events
> at the same speed that the appender can consume them. So from that point the
> application becomes IO-bound.
> The correct size of the queue is both application and environment dependent.
> At what rate do events arrive during a burst? How long does a burst continue?
> How fast can the consumer take events off the queue?
> In order to be able to tune the queue size, users need a way to sample the
> queue usage: at the time of the snapshot, how many events are in the queue
> waiting to be processed? (In concurrent scenarios the answer to this question
> is pretty much always out of date, but it is still useful to help determine a
> good queue size.)
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