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[jetty-users] Threading issue with AsyncListener.onTimeout
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Jetty version: 9.3.8, Java Version 1.8.0_73
I noticed that the .onTimeout-Method is executed in a Thread called
Scheduler-<some number> instead of the qtp-threads other method
(onStart/onComplete) are called.
Since it seems there are only a small number of Scheduler Threads (in my
installation I found that there seem one per connector + one other) if
some work blocks in onTimeout the server gets unresponsive at least in
respect to other timout events.
Since I have not found much about the jetty Scheduler-Threads (only that
there is some kind of Scheduler-Service) I'd liek to ask:
- What are they used for and how many of them would one expect?
- Can I configure the Number of Threads available, maybe with another
Threadpool?
- Is it desired that onTimeout is executed in this (spare) Threads?
- If yes why is it not executed in the qtp like other event methods?
I tried to force the work back to the qtp-thread by using:
event.getAsyncContext().getRequest().setAttribute("Timeout", true);
event.getAsyncContext().dispatch();
in the onTimeout. But this only calls onComplete on my listener and
never reaches my servlet again.
Thanks for any hints :-)