time out on big object ??

[Geoff Simmons]

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On 05/30/11 05:39 PM, Patrick CAO HUU THIEN wrote:
> hello.
> 
> I made a basic «out of the box» varnish server to access a «personal» web
> server ... in fact, just define a backend.
> But I have a problem when I test the download of big object (iso with
> ~630Mb) with this message:
> 
> wget http://xxxxx/iso/ubuntu-zz-10.04.2-desktop-i386.iso
> --2011-05-30 09:28:19--http://xxxx/iso/ubuntu-zz-10.04.2-desktop-i386.iso
> Resolving xxxxx... yy.yy.yy.yy
> Connecting to xxxxx|yy.yy.yy.yy|:80... connected.
> HTTP request sent, awaiting response... 200 OK
> Length: 854108160 (815M) [application/x-iso9660-image]
> Saving to: `ubuntu-zz-10.04.2-desktop-i386.iso'
> 
> 53% [===================>                   ] 458,763,695  453K/s   in 10m 0s
> 
> 2011-05-30 09:38:26 (746 KB/s) - Connection closed at byte 458763695. Retrying
> 
> 
> The time-out always appear after 10 mins.
> 
> Can I have some advices to help me resolve this .... like don't cache big
> object or specific URL ?

The default value of the send_timeout parameter is 600 seconds:

"Send timeout for client connections. If no data has been sent to the
client in this many seconds, the session is closed. See setsockopt(2)
under SO_SNDTIMEO for more information."

Probably what's happening is that Varnish needs more than 10 minutes to
read the 630 MB monster from your backend, during which the client
connection sits idle, and the timeout elapses.

You could set a higher timeout with -p send_timeout=<more than 600>, but
you're probably much better off having VCL return pass on that
particular URL. Unless you really need Varnish to take up 630 MB of
space just to cache your Ubuntu ISO.


Best,
Geoff
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