Can you figure out when the error appears? Maybe it appears when the file is downloaded
from backend and written to cache (if you have one) or when serving from cache etc.

On 19 Sep 2014, at 14:46, shahzaib shahzaib <shahzaib.cb@gmail.com> wrote:

> Nope, it doesn't !!
>
> On Fri, Sep 19, 2014 at 3:42 PM, Roman Arutyunyan <arut@nginx.com> wrote:
> Will this error appear if you try this request again?
>
> On 17 Sep 2014, at 16:29, shahzaib shahzaib <shahzaib.cb@gmail.com> wrote:
>
> > Well, i again received the same error but its much improvement in time frame. If the error was occurring after each 5min, now the same error is occurring after 30~50min.
> >
> > The conclusion is, nginx-1.7.4 is not 100% bug free from this issue.
> >
> > 2014/09/17 17:22:48 [alert] 28559#0: *27961 zero size buf in output t:0 r:0 f:0 000000000477EE20 000000000477EE20-000000000477FE20 0000000000000000 0-0 while sending to client, client: 115.167.75.22, server: ldx.files.com, request: "GET /files/videos/2014/09/04/140984890338bc7-240.mp4 HTTP/1.1",
> >
> > [root@tw data]# nginx -V
> > nginx version: nginx/1.7.4
> > built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
> > configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --user=nginx --group=nginx --with-http_flv_module --with-http_mp4_module
> > You have mail in /var/spool/mail/root
> >
> >
> > Regards.
> > Shahzaib
> >
> > On Wed, Sep 17, 2014 at 4:25 PM, shahzaib shahzaib <shahzaib.cb@gmail.com> wrote:
> > Hi Maxim,
> >
> > Upgraded nginx to 1.7.4 and looks like the issue is gone.
> >
> > Regards.
> > Shahzaib
> >
> >
> > On Wed, Aug 27, 2014 at 10:16 PM, Maxim Dounin <mdounin@mdounin.ru> wrote:
> > Hello!
> >
> > On Wed, Aug 27, 2014 at 08:48:19PM +0500, shahzaib shahzaib wrote:
> >
> > > We're facing following error on edge server with nginx-1.6.1, using
> > > proxy_store on edge.
> > >
> > > 2014/08/27 20:35:05 [alert] 5701#0: *21244 zero size buf in output t:0 r:0
> > > f:0 0000000002579840 0000000002579840-000000000257A840 0000000000000000 0-0
> > > while sending to client, client: 119.160.118.123, server:
> > > storage4.content.com, request: "GET
> > > /files/videos/2013/06/30/137256108550d07-m.mp4 HTTP/1.1", upstream: "
> > > http://82.2.37.87:80/files/videos/2013/06/30/137256108550d07-m.mp4", host: "
> > > storage4.content.com"
> > > 2014/08/27 20:35:28 [alert] 5687#0: *26261 zero size buf in output t:0 r:0
> > > f:0 0000000004F5F2D0 0000000004F5F2D0-0000000004F602D0 0000000000000000 0-0
> > > while sending to client, client: 121.52.147.68, server: storage9.content.com,
> > > request: "GET /files/videos/2014/04/21/1398060531bb2e3-360.mp4 HTTP/1.1",
> > > upstream: "
> > > http://9.7.248.180:80/files/videos/2014/04/21/1398060531bb2e3-360.mp4",
> > > host: "storage9.content.com", referrer: "
> > > http://files.com/video/2618018/aashiqui-3-new-songs"
> > >
> > > nginx version: nginx/1.6.1
> > > built by gcc 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)
> > > configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx
> > > --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log
> > > --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid
> > > --lock-path=/var/run/nginx.lock
> > > --http-client-body-temp-path=/var/cache/nginx/client_temp
> > > --http-proxy-temp-path=/var/cache/nginx/proxy_temp --user=nginx
> > > --group=nginx --with-http_flv_module --with-http_mp4_module
> >
> > You may want to try 1.7.4 to see if it helps (there are some
> > potentially related changes in nginx 1.7.3).
> >
> > If it doesn't, providing debug log may be helpful. See
> > http://wiki.nginx.org/Debugging for more hints.
> >
> > --
> > Maxim Dounin
> > http://nginx.org/
> >
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> >
> >
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