From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: A barrage of unexplained timeouts
Date: Thu, 22 Aug 2013 17:05:31 +0000 [thread overview]
Message-ID: <20130822170531.GA14711@dcvr.yhbt.net> (raw)
In-Reply-To: <1377177042.425819917@apps.rackspace.com>
nick@auger.net wrote:
> "Eric Wong" <normalperson@yhbt.net> said:
> > Jimmy Soho <jimmy.soho@gmail.com> wrote:
> >> Is a response send back by rails / unicorn fully buffered by nginx? Or
> >> is a unicorn worker blocked until the response is confirmed to have
> >> been successfully received by the client?
> >
> > nginx fully buffers both requests and responses by default.
> > Which leads us to...
> >
> >> Aside: how do you protect your unicorn workers against a barrage of
> >> client requests that eat the response veeeeeery sloooooooowly?
> >
> > That's the whole point of using nginx with unicorn. nginx shields
> > unicorn from slow clients.
> Is it possible that the behavior could be related to nginx? Nginx
> hanging onto the connection too long from the worker, so that the
> worker never makes it back into the pool and eventually get's killed
> for not checking in?
Unlikely. That'd be a serious bug in nginx since nginx was originally
designed to do this buffering since the earliest versions. Which
version of nginx are you running? Can you be sure "proxy_buffering off"
is _not_ set anywhere?
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prev parent reply other threads:[~2013-08-22 17:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 14:47 A barrage of unexplained timeouts nick
2013-08-20 16:37 ` Eric Wong
2013-08-20 17:27 ` nick
2013-08-20 17:40 ` Eric Wong
2013-08-20 18:11 ` nick
2013-08-20 18:49 ` Eric Wong
2013-08-20 20:03 ` nick
2013-08-20 20:42 ` Eric Wong
2013-08-20 21:19 ` nick
2013-08-20 21:32 ` Eric Wong
2013-08-21 13:33 ` nick
2013-08-22 2:32 ` Jimmy Soho
2013-08-22 4:09 ` Eric Wong
2013-08-22 13:10 ` nick
2013-08-22 17:05 ` Eric Wong [this message]
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