* graceful shutdown @ 2011-05-01 20:52 Mike Perham [not found] ` <BANLkTimZtpKWjyRa0M9habiw1npXdMkUBQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 0 siblings, 1 reply; 2+ messages in thread From: Mike Perham @ 2011-05-01 20:52 UTC (permalink / raw) To: Rainbows! list I've got a multithreaded system, some threads are responding to web requests, others are performing background/async tasks. Is there any way to implement graceful shutdown with Rainbows? Currently I have a blocking SIGQUIT shutdown hook for my async task library: https://github.com/mperham/girl_friday/blob/master/lib/girl_friday.rb#L55 Will this work? Is this all that's really needed? _______________________________________________ Rainbows! mailing list - rainbows-talk-GrnCvJ7WPxnNLxjTenLetw@public.gmane.org http://rubyforge.org/mailman/listinfo/rainbows-talk Do not quote signatures (like this one) or top post when replying ^ permalink raw reply [flat|nested] 2+ messages in thread
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* Re: graceful shutdown [not found] ` <BANLkTimZtpKWjyRa0M9habiw1npXdMkUBQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> @ 2011-05-01 21:51 ` Eric Wong 0 siblings, 0 replies; 2+ messages in thread From: Eric Wong @ 2011-05-01 21:51 UTC (permalink / raw) To: Rainbows! list Mike Perham <mperham-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > I've got a multithreaded system, some threads are responding to web > requests, others are performing background/async tasks. Is there any > way to implement graceful shutdown with Rainbows? Currently I have a > blocking SIGQUIT shutdown hook for my async task library: > > https://github.com/mperham/girl_friday/blob/master/lib/girl_friday.rb#L55 > > Will this work? Is this all that's really needed? No, install an at_exit block instead. Rainbows! itself relies on SIGQUIT for graceful shutdown, so your trap would conflict with that. There are some caveats since Rainbows! won't wait forever for graceful shutdowns, either. The Unicorn/Rainbows! master process defaults the "timeout"[1] parameter to 60s. If an at_exit handler takes a long time, increase the "timeout" directive. The "timeout" directive affects how long the master process will wait for a worker process to gracefully exit after a SIQQUIT is sent. If the timeout expires after SIGQUIT, the master will assume the worker is non-responsive/stuck and send a SIGKILL to finish the worker off. By definition of a graceful shutdown, Rainbows! will also try to wait until all currently running requests are complete, too[2]. Having a long keepalive_timeout (default is only 5s) also affects the time it takes to shutdown[3]. [1] http://unicorn.bogomips.org/Unicorn/Configurator.html#method-i-timeout [2] this is a huge pain for infinite endpoints like http://raindrops-demo.bogomips.org/tail/0.0.0.0%3A80.txt :< [3] It's not consistent across concurrency options right now and not easy to fix consistently. -- Eric Wong _______________________________________________ Rainbows! mailing list - rainbows-talk-GrnCvJ7WPxnNLxjTenLetw@public.gmane.org http://rubyforge.org/mailman/listinfo/rainbows-talk Do not quote signatures (like this one) or top post when replying ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2011-05-01 21:52 UTC | newest] Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-05-01 20:52 graceful shutdown Mike Perham [not found] ` <BANLkTimZtpKWjyRa0M9habiw1npXdMkUBQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2011-05-01 21:51 ` Eric Wong
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