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From Benjamin Jaton <benjamin.ja...@gmail.com>
Subject Re: How to have a separate log file for a thread and all sub threads?
Date Wed, 24 Apr 2019 05:12:50 GMT
> If you want all the threads in a “job” then I would create the parent
thread with its own thread group and use the thread group name in the
lookup.

But how do I assign the thread group to threads that 3rd party libraries
create? I don't think child threads naturally inherit the ThreadGroup of
their parents.

On Tue, Apr 23, 2019 at 8:36 PM Ralph Goers <ralph.goers@dslextreme.com>
wrote:

> I think the solution is pretty simple. The RoutingAppender doesn’t only
> work with the ThreadContext. It works using a lookup. So if you were to use
> a ThreadLookup that used ${{thread:id}} you would get a new Appender for
> each thread id. To be honest, I am not sure why we haven’t created a
> ThreadLookup before. I could easily see multiple places were the thread id,
> name, priority or ThreadGroup name might want to be used.
>
> If you want all the threads in a “job” then I would create the parent
> thread with its own thread group and use the thread group name in the
> lookup.
>
> Ralph
>
> > On Apr 23, 2019, at 5:06 PM, Benjamin Jaton <benjamin.jaton@gmail.com>
> wrote:
> >
> > Hello,
> >
> > Several times I've been in a situation where in a given JVM I am trying
> to
> > run distinct jobs in separate threads, who themselves might spawn their
> own
> > threads.
> > In those situations I usually want the logging of each job in a separate
> > log file, and that has proven to be difficult.
> >
> > Log4j2 has a routing appender that allows to create a separate appender
> for
> > each job given that you can provide a routing key that's unique for each
> > job. But what key to use for this?
> > I've been using a ThreadContext variable that I set at the level of the
> job
> > thread, and any child thread that I have control over.
> >
> > But the problem is that I don't always have control over this. Sometimes
> > third party APIs let you feed a custom ThreadFactory, sometimes they
> don't.
> > When they don't, I can't set that ThreadContext variable and part of the
> > job logging will be misrouted to a different appender.
> >
> > Is there a way to work around this so that there is 1 log file for each
> job
> > that would gather all the logging of the sub threads?
> >
> > Thanks,
> > Benjamin
>
>
>
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