Varnish intermittently returns incomplete images

[Guillaume Quintard]

Hi,

Do you have objects that are sensibly smaller that your images in your
cache?

What you are describing sounds like LRU failure (check nuke_limit in
"varnishadm param.show"), basically, on a miss, varnish couldn't evict
enough objects and make room for the new object, so it had to truncate it
and throw it away.

If that's the issue, you can increase nuke_limit, or get a bigger cache, or
segregate small and large objects into different storages.

-- 
Guillaume Quintard


On Fri, May 8, 2020 at 10:14 AM Batanun B <batanun at hotmail.com> wrote:

> Our Varnish (test environment) intermittently returns incomplete images.
> So the binary content is not complete. When requesting the image from the
> backend directly (using curl), the complete image is returned every time (I
> tested 1000 times using a script).
>
> This happens intermittently. Sometimes Varnish returns the complete image,
> sometimes half of it, sometimes 20% etc... The incomplete image is returned
> quickly, so I don't think there is a timeout involved (we have not
> configured any specific timeout in varnish).
>
> I see nothing special in varnishlog when this happens. But I don't know
> how to troubleshoot this in a good way. Any suggestions?
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