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Re: upstream keepalive - call for testing

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File Name File Size   Posted by Date  
upstream.patch 2.3 KB open | download Matthieu Tourne 08/12/2011 Read message
ngx_http_upstream_keepalive.patch 542 bytes open | download Matthieu Tourne 08/12/2011 Read message
upstream.patch 2.6 KB open | download Matthieu Tourne 08/12/2011 Read message
Matthieu Tourne
August 12, 2011 05:14PM
Also, if I was planning on having a lot of different connections using the
upstream keepalive module.
Would it make sense to convert the queues into rbtrees for faster lookup ?

Thank you!

Matthieu.

On Fri, Aug 12, 2011 at 12:59 PM, Maxim Dounin <mdounin@mdounin.ru> wrote:

> Hello!
>
> On Fri, Aug 12, 2011 at 12:32:26PM -0700, Matthieu Tourne wrote:
>
> > Hi all,
> >
> > I think I have found a small issue, if we're using proxy_pass to talk to
> an
> > origin that doesn't support keep alives.
> > The origin will return a HTTP header "Connection: close", and terminate
> the
> > connection (TCP FIN).
> > We don't take this into account, and assume there is a keep-alive
> connection
> > available.
> > The next time the connection is used, it won't be part of a valid TCP
> > stream, and the origin server will send a TCP RST.
>
> Yes, I'm aware of this, thank you. Actually, this is harmless:
> upstream keepalive module should detect connection was closed
> while keeping it, and even if it wasn't able to do so - nginx will
> re-try sending request if sending to cached connection fails.
>
> > This can be simulated with 2 nginx instances, one acting as a reverse
> proxy
> > with keep alive connection. And the other using the directive
> > keepalive_timeout 0; (which will always terminate connections right
> away).
> >
> > The patches attached take into account the response of the origin, and
> > should fix this issue.
>
> I'm planing to add similar patch, thanks.
>
> Maxim Dounin
>
> >
> > Matthieu.
> >
> > On Mon, Aug 8, 2011 at 2:36 AM, SplitIce <mat999@gmail.com> wrote:
> >
> > > Oh and I havent been able to reproduce the crash, I tried for a while
> but
> > > gave up. if it happens again ill build with debugging and restart
> howeaver
> > > so far its been 36hours without issues (under a significant amount of
> > > traffic)
> > >
> > >
> > > On Mon, Aug 8, 2011 at 7:35 PM, SplitIce <mat999@gmail.com> wrote:
> > >
> > >> 50ms per HTTP request (taken from firebug and chrome resource panel)
> as
> > >> the time it takes the html to load from request to arrival.
> > >> 200ms is the time saved by when the http starts transfering to me
> > >> (allowing other resources to begin downloading before the HTML
> completes),
> > >> previously the html only started transfering after the full request
> was
> > >> downloaded to the proxy server (due to buffering)
> > >>
> > >> HTTP to talk to the backends (between countries)
> > >>
> > >> The node has a 30-80ms ping time between the backend and frontend.
> > >> (Russia->Germany, Sweden->NL, Ukraine->Germany/NL etc)
> > >>
> > >> On Mon, Aug 8, 2011 at 7:22 PM, Maxim Dounin <mdounin@mdounin.ru>
> wrote:
> > >>
> > >>> Hello!
> > >>>
> > >>> On Mon, Aug 08, 2011 at 02:44:12PM +1000, SplitIce wrote:
> > >>>
> > >>> > Been testing this on my servers now for 2 days now, handling
> > >>> approximately
> > >>> > 100mbit of constant traffic (3x20mbit, 1x40mbit).
> > >>> >
> > >>> > Havent noticed any large bugs, had an initial crash on one of the
> > >>> > servers however havent been able to replicate. The servers are a
> > >>> mixture of
> > >>> > openvz, XEN and one vmware virtualised containers running debian
> lenny
> > >>> or
> > >>> > squeeze,
> > >>>
> > >>> By "crash" you mean nginx segfault? If yes, it would be great to
> > >>> track it down (either to fix problem in keepalive patch or to
> > >>> prove it's unrelated problem).
> > >>>
> > >>> > Speed increases from this module are decent, approximately 50ms
> from
> > >>> the
> > >>> > request time and the HTTP download starts 200ms earler resulting in
> a
> > >>> 150ms
> > >>> > quicker load time on average.
> > >>>
> > >>> Sounds cool, but I don't really understand what "50ms from the
> > >>> request time" and "download starts 200ms earler" actually means.
> > >>> Could you please elaborate?
> > >>>
> > >>> And, BTW, do you use proxy or fastcgi to talk to backends?
> > >>>
> > >>> Maxim Dounin
> > >>>
> > >>> >
> > >>> > all in all, seems good.
> > >>> >
> > >>> > Thanks for all your hard work Maxim.
> > >>> >
> > >>> > On Thu, Aug 4, 2011 at 4:51 PM, Maxim Dounin <mdounin@mdounin.ru>
> > >>> wrote:
> > >>> >
> > >>> > > Hello!
> > >>> > >
> > >>> > > On Wed, Aug 03, 2011 at 05:06:56PM -0700, Matthieu Tourne wrote:
> > >>> > >
> > >>> > > > Hi,
> > >>> > > >
> > >>> > > > I'm trying to use keepalive http connections for proxy_pass
> > >>> directives
> > >>> > > > containing variables.
> > >>> > > > Currently it only works for named upstream blocks.
> > >>> > > >
> > >>> > > > I'm wondering what would be the easiest way,
> > >>> > > > maybe setting peer->get to ngx_http_upstream_get_keepalive_peer
> and
> > >>> > > > kp->original_get_peer to
> ngx_http_upstream_get_round_robin_peer()
> > >>> towards
> > >>> > > > the end of ngx_http_create_round_robin_peer().
> > >>> > > > If I can figure how to set kp->conf to something sane this
> might
> > >>> work :)
> > >>> > > >
> > >>> > > > Thoughts ?
> > >>> > >
> > >>> > > You may try to pick one from upstream's main conf upstreams
> > >>> > > array (e.g. one from first found upstream with init set to
> > >>> > > ngx_http_upstream_init_keepalive). Dirty, but should work.
> > >>> > >
> > >>> > > Maxim Dounin
> > >>> > >
> > >>> > > >
> > >>> > > > Thank you,
> > >>> > > > Matthieu.
> > >>> > > >
> > >>> > > > On Tue, Aug 2, 2011 at 10:21 PM, SplitIce <mat999@gmail.com>
> > >>> wrote:
> > >>> > > >
> > >>> > > > > Ive been testing this on my localhost and one of my live
> servers
> > >>> (http
> > >>> > > > > backend) for a good week now, I haven't had any issues that I
> > >>> have
> > >>> > > noticed
> > >>> > > > > as of yet.
> > >>> > > > >
> > >>> > > > > Servers are Debian Lenny and Debian Squeeze (oldstable,
> stable)
> > >>> > > > >
> > >>> > > > > Hoping it will make it into the developer (1.1.x) branch soon
> :)
> > >>> > > > >
> > >>> > > > >
> > >>> > > > > On Wed, Aug 3, 2011 at 1:57 PM, liseen <liseen.wan@gmail.com
> >
> > >>> wrote:
> > >>> > > > >
> > >>> > > > >> Hi
> > >>> > > > >>
> > >>> > > > >> Could nginx keepalive work with HealthCheck? Does Maxim
> Dounin
> > >>> have
> > >>> > > a
> > >>> > > > >> support plan?
> > >>> > > > >>
> > >>> > > > >>
> > >>> > > > >>
> > >>> > > > >> On Wed, Aug 3, 2011 at 3:09 AM, David Yu <
> > >>> david.yu.ftw@gmail.com>
> > >>> > > wrote:
> > >>> > > > >>
> > >>> > > > >>>
> > >>> > > > >>>
> > >>> > > > >>> On Wed, Aug 3, 2011 at 2:47 AM, Maxim Dounin <
> > >>> mdounin@mdounin.ru>
> > >>> > > wrote:
> > >>> > > > >>>
> > >>> > > > >>>> Hello!
> > >>> > > > >>>>
> > >>> > > > >>>> On Wed, Aug 03, 2011 at 01:53:30AM +0800, David Yu wrote:
> > >>> > > > >>>>
> > >>> > > > >>>> > On Wed, Aug 3, 2011 at 1:50 AM, Maxim Dounin <
> > >>> mdounin@mdounin.ru>
> > >>> > > > >>>> wrote:
> > >>> > > > >>>> >
> > >>> > > > >>>> > > Hello!
> > >>> > > > >>>> > >
> > >>> > > > >>>> > > On Wed, Aug 03, 2011 at 01:42:13AM +0800, David Yu
> wrote:
> > >>> > > > >>>> > >
> > >>> > > > >>>> > > > On Wed, Aug 3, 2011 at 1:36 AM, Maxim Dounin <
> > >>> > > mdounin@mdounin.ru>
> > >>> > > > >>>> wrote:
> > >>> > > > >>>> > > >
> > >>> > > > >>>> > > > > Hello!
> > >>> > > > >>>> > > > >
> > >>> > > > >>>> > > > > On Tue, Aug 02, 2011 at 04:24:45PM +0100, António
> P.
> > >>> P.
> > >>> > > Almeida
> > >>> > > > >>>> wrote:
> > >>> > > > >>>> > > > >
> > >>> > > > >>>> > > > > > On 1 Ago 2011 17h07 WEST, mdounin@mdounin.ruwrote:
> > >>> > > > >>>> > > > > >
> > >>> > > > >>>> > > > > > > Hello!
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > JFYI:
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > Last week I posted patch to nginx-devel@which
> > >>> adds
> > >>> > > > >>>> keepalive
> > >>> > > > >>>> > > > > > > support to various backends (as with upstream
> > >>> keepalive
> > >>> > > > >>>> module),
> > >>> > > > >>>> > > > > > > including fastcgi and http backends (this in
> turn
> > >>> means
> > >>> > > > >>>> nginx now
> > >>> > > > >>>> > > > > > > able to talk HTTP/1.1 to backends, in
> particular
> > >>> it now
> > >>> > > > >>>> > > > > > > understands chunked responses). Patch applies
> to
> > >>> 1.0.5
> > >>> > > and
> > >>> > > > >>>> 1.1.0.
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > Testing is appreciated.
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > You may find patch and description here:
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > >
> > >>> > > > >>>>
> > >>> > >
> http://mailman.nginx.org/pipermail/nginx-devel/2011-July/001057.html
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > Patch itself may be downloaded here:
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > >
> > >>> http://nginx.org/patches/patch-nginx-keepalive-full.txt
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > > Upstream keepalive module may be downloaded
> here:
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > > >
> http://mdounin.ru/hg/ngx_http_upstream_keepalive/
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>>
> > >>> http://mdounin.ru/files/ngx_http_upstream_keepalive-0.4.tar.gz
> > >>> > > > >>>> > > > > > >
> > >>> > > > >>>> > > > > >
> > >>> > > > >>>> > > > > > So *either* we use the patch or use the module..
> > >>> Correct?
> > >>> > > > >>>> > > > >
> > >>> > > > >>>> > > > > No, to keep backend connections alive you need
> module
> > >>> *and*
> > >>> > > > >>>> patch.
> > >>> > > > >>>> > > > > Patch provides foundation in nginx core for module
> to
> > >>> work
> > >>> > > with
> > >>> > > > >>>> > > > > fastcgi and http.
> > >>> > > > >>>> > > > >
> > >>> > > > >>>> > > > With a custom nginx upstream binary protocol, I
> believe
> > >>> > > > >>>> multiplexing will
> > >>> > > > >>>> > > > now be possible?
> > >>> > > > >>>> > >
> > >>> > > > >>>> > > ENOPARSE, sorry.
> > >>> > > > >>>> > >
> > >>> > > > >>>> > After some googling ...
> > >>> > > > >>>> > ENOPARSE is a nerdy term. It is one of the standard C
> > >>> library
> > >>> > > error
> > >>> > > > >>>> codes
> > >>> > > > >>>> > that can be set in the global variable "errno" and
> stands
> > >>> for
> > >>> > > Error No
> > >>> > > > >>>> > Parse. Since you didn't get it, I can thus conclude that
> > >>> unlike me
> > >>> > > you
> > >>> > > > >>>> are probably
> > >>> > > > >>>> > a normal, well adjusted human being ;-)
> > >>> > > > >>>>
> > >>> > > > >>>> Actually, this definition isn't true: there is no such
> error
> > >>> code,
> > >>> > > > >>>> it's rather imitation. The fact that author of definition
> > >>> claims
> > >>> > > > >>>> it's real error indicate that unlike me, he is normal,
> well
> > >>> > > > >>>> adjusted human being. ;)
> > >>> > > > >>>>
> > >>> > > > >>>> > Now I get it. Well adjusted I am.
> > >>> > > > >>>>
> > >>> > > > >>>> Now you may try to finally explain what you mean to ask in
> > >>> your
> > >>> > > > >>>> original message. Please keep in mind that your are
> talking
> > >>> to
> > >>> > > > >>>> somebody far from being normal and well adjusted. ;)
> > >>> > > > >>>>
> > >>> > > > >>>> Maxim Dounin
> > >>> > > > >>>>
> > >>> > > > >>>> p.s. Actually, I assume you are talking about fastcgi
> > >>> > > > >>>> multiplexing.
> > >>> > > > >>>
> > >>> > > > >>> Nope not fastcgi multiplexing. Multiplexing over a
> > >>> custom/efficient
> > >>> > > > >>> nginx binary protocol.
> > >>> > > > >>> Where requests sent to upstream include a unique id w/c the
> > >>> upstream
> > >>> > > will
> > >>> > > > >>> also send on response.
> > >>> > > > >>> This allows for asychronous, out-of-bands, messaging.
> > >>> > > > >>> I believe this is what mongrel2 is trying to do now ...
> though
> > >>> as an
> > >>> > > http
> > >>> > > > >>> server, it is nowhere near as robust/stable as nginx.
> > >>> > > > >>> If nginx implements this (considering nginx already has a
> lot
> > >>> of
> > >>> > > market
> > >>> > > > >>> share), it certainly would bring more developers/users in
> > >>> (especially
> > >>> > > the
> > >>> > > > >>> ones needing async, out-of-bands request handling)
> > >>> > > > >>>
> > >>> > > > >>>
> > >>> > > > >>> Short answer is: no, it's still not possible.
> > >>> > > > >>>>
> > >>> > > > >>>> _______________________________________________
> > >>> > > > >>>> nginx mailing list
> > >>> > > > >>>> nginx@nginx.org
> > >>> > > > >>>> http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > > > >>>>
> > >>> > > > >>>
> > >>> > > > >>>
> > >>> > > > >>>
> > >>> > > > >>> --
> > >>> > > > >>> When the cat is away, the mouse is alone.
> > >>> > > > >>> - David Yu
> > >>> > > > >>>
> > >>> > > > >>> _______________________________________________
> > >>> > > > >>> nginx mailing list
> > >>> > > > >>> nginx@nginx.org
> > >>> > > > >>> http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > > > >>>
> > >>> > > > >>>
> > >>> > > > >>
> > >>> > > > >> _______________________________________________
> > >>> > > > >> nginx mailing list
> > >>> > > > >> nginx@nginx.org
> > >>> > > > >> http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > > > >>
> > >>> > > > >>
> > >>> > > > >
> > >>> > > > >
> > >>> > > > > --
> > >>> > > > > Warez Scene http://thewarezscene.org Free Rapidshare
> > >>> Downloads<
> > >>> > > http://www.nexusddl.com>
> > >>> > > > >
> > >>> > > > >
> > >>> > > > > _______________________________________________
> > >>> > > > > nginx mailing list
> > >>> > > > > nginx@nginx.org
> > >>> > > > > http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > > > >
> > >>> > > > >
> > >>> > >
> > >>> > > > _______________________________________________
> > >>> > > > nginx mailing list
> > >>> > > > nginx@nginx.org
> > >>> > > > http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > >
> > >>> > > _______________________________________________
> > >>> > > nginx mailing list
> > >>> > > nginx@nginx.org
> > >>> > > http://mailman.nginx.org/mailman/listinfo/nginx
> > >>> > >
> > >>> >
> > >>> >
> > >>> >
> > >>> > --
> > >>> > Warez Scene http://thewarezscene.org Free Rapidshare
> > >>> > Downloadshttp://www.nexusddl.com
> > >>>
> > >>> > _______________________________________________
> > >>> > nginx mailing list
> > >>> > nginx@nginx.org
> > >>> > http://mailman.nginx.org/mailman/listinfo/nginx
> > >>>
> > >>> _______________________________________________
> > >>> nginx mailing list
> > >>> nginx@nginx.org
> > >>> http://mailman.nginx.org/mailman/listinfo/nginx
> > >>>
> > >>
> > >>
> > >>
> > >> --
> > >> Warez Scene http://thewarezscene.org Free Rapidshare Downloads<
> http://www.nexusddl.com>
> > >>
> > >>
> > >
> > >
> > > --
> > > Warez Scene http://thewarezscene.org Free Rapidshare Downloads<
> http://www.nexusddl.com>
> > >
> > >
> > > _______________________________________________
> > > nginx mailing list
> > > nginx@nginx.org
> > > http://mailman.nginx.org/mailman/listinfo/nginx
> > >
> > >
>
>
>
> > _______________________________________________
> > nginx mailing list
> > nginx@nginx.org
> > http://mailman.nginx.org/mailman/listinfo/nginx
>
> _______________________________________________
> nginx mailing list
> nginx@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx
>
_______________________________________________
nginx mailing list
nginx@nginx.org
http://mailman.nginx.org/mailman/listinfo/nginx
Subject Author Posted

upstream keepalive - call for testing

Maxim Dounin August 01, 2011 12:10PM

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