[logback-user] How can I monitor the actual size of the asyncappender queue?

[KARR, DAVID]

Ok, that’s perfect, thanks.

From: logback-user <logback-user-bounces at qos.ch> On Behalf Of haobo liu
Sent: Friday, May 28, 2021 6:01 PM
To: logback users list <logback-user at qos.ch>
Subject: Re: [logback-user] How can I monitor the actual size of the asyncappender queue?

The code like

LoggerContext loggerContext  = (LoggerContext) LoggerFactory.getILoggerFactory();
ch.qos.logback.classic.Logger logger = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
AsyncAppender sync = (AsyncAppender) logger.getAppender("async");
int numberOfElementsInQueue = sync.getNumberOfElementsInQueue();

KARR, DAVID <dk068x at att.com<mailto:dk068x at att.com>> 于2021年5月28日周五 下午11:09写道：
Thanks for replying, but I think you’re missing the point.  I’m well aware of how to define an AsyncAppender.  I’m investigating how to properly monitor the size of the queue.

From: logback-user <logback-user-bounces at qos.ch<mailto:logback-user-bounces at qos.ch>> On Behalf Of haobo liu
Sent: Thursday, May 27, 2021 11:52 PM
To: logback users list <logback-user at qos.ch<mailto:logback-user at qos.ch>>
Subject: Re: [logback-user] How can I monitor the actual size of the asyncappender queue?

in xml the name like
<appender name="async" class="ch.qos.logback.classic.AsyncAppender">
    <queueSize>500</queueSize>
    <discardingThreshold>0</discardingThreshold>
    <appender-ref ref="info"/>
</appender>

KARR, DAVID <dk068x at att.com<mailto:dk068x at att.com>> 于2021年5月28日周五 下午1:32写道：

KARR, DAVID <dk068x at att.com<mailto:dk068x at att.com>> 于2021年5月28日周五 下午1:32写道：
> -----Original Message-----
> From: logback-user <logback-user-bounces at qos.ch<mailto:logback-user-bounces at qos.ch>> On Behalf Of haobo liu
> Sent: Thursday, May 27, 2021 6:30 PM
> To: logback users list <logback-user at qos.ch<mailto:logback-user at qos.ch>>
> Subject: Re: [logback-user] How can I monitor the actual size of the
> asyncappender queue?
>
> maybe ch.qos.logback.core.AsyncAppenderBase#getNumberOfElementsInQueue
>  or hack the code add a volatile variable (bad idea)

Ok, then the next question is how do I access this from code?  I see that Logger's base hierarchy has a "getAppender(String)" method.  What is the input parameter for that?

Once I solve that, I guess I have to think about whether it makes sense to write occasional log messages that print the current queue size (which would obviously go into the queue).  I wonder if I can render it in a JMX property?

> KARR, DAVID <dk068x at att.com<mailto:dk068x at att.com>> 于2021年5月28日周五 上午12:02写道：
> >
> > I believe I now understand the basic mechanics of the AsyncAppender
> queue, and the tradeoffs of having it small or large.
> >
> > What's not obvious to me is how I can monitor the utilization of the
> queue, perhaps in a load test.  I did notice there is a "listener"
> mechanism, and one example I believe illustrates how I can detect when
> logs are dropped because the queue is full, but I want to get an idea of
> how well the queue size is being utilized, or how close it's getting to
> being full.
> > _______________________________________________
> > logback-user mailing list
> > logback-user at qos.ch<mailto:logback-user at qos.ch>
> >
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