Troubles shutting Janus down about janus-gateway

[lminiero]

Yes, it's a known issue. It's the libmicrohttpd MHD_stop_daemon method that occasionally gets stuck, because of some internal pthread_join clearing connections that never return.

[lminiero]

You can read the post I wrote on their ML here:

http://lists.gnu.org/archive/html/libmicrohttpd/2014-04/msg00017.html

[nschoe]

Hum okay.
Sorry for that.

Good job.

[nschoe]

Just a little update : I don't know if this s because I switched to the websockets implementation rather than the RESTful, but it seems I don't have that shutting-down probem anymore. One CTRL+C is enough to shut down Janus.
Or maybe they fixed the problem, but I don't recall libmicrohttpd getting an update (though I can't guarantee there hasn't been one either).

[lminiero]

If you're just using websockets, you're never passing through MHD and so
are never creating a connection either. The issue sometime arises when
getting rid of stale connection objects/threads.
Il 29/lug/2014 09:01 "nschoe" [email protected] ha scritto:

Just a little update : I don't know if this s because I switched to the
websockets implementation rather than the RESTful, but it seems I don't
have that shutting-down probem anymore. One CTRL+C is enough to shut down
Janus.
Or maybe they fixed the problem, but I don't recall libmicrohttpd getting
an update (though I can't guarantee there hasn't been one either).

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[lminiero]

Closing as it's MHD related.

[MichaelB76]

@lminiero - Found this issue after debugging the hang on MHD_stop_daemon, would this be worth adding to the FAQ maybe? Running 'apachectl graceful' from a terminal kicks it back into life, we are using this as a work around at the moment.

[lminiero]

@MichaelB76 thanks for the tip, although I don't think it's always related to that as IIRC sometimes this can happen even when no proxy is involved.

[ploxiln]

I think Chrome tends to open connections pre-emptively, and sometimes never actually has enough requests to use them; I've seen odd (harmless) error messages related to that in other software which receives http requests from Chrome.

I never seem to have this problem with janus, and maybe it's because in my setup, the browser doesn't make http requests directly to janus, it goes through a separate "api" application, which makes the http requests to janus.

[MichaelB76]

Yes, I don't think the problem is related to use of Apache either, that's just a work-around we've found when using it as a proxy. It's interesting that it kicks the library back into life. Another thing I've seen in the past, although I can't seem to reproduce it now, is that attempting a new connection to Janus while it is shutting down sometime causes MHD_stop_daemon() to unhang and return.

[lminiero]

I think that's what MHD_quiesce_daemon was supposed to prevent, but it caused much more frequent hangs at shutdown and so we removed those calls.