Mailing List Archive: Varnish: Misc

Sudden hit_for_pass

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james at talkunafraid

Jul 31, 2013, 7:50 AM

Post #1 of 3 (51 views)
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Sudden hit_for_pass

Hi,

I have a varnish server sat in front of a website which was previously
sitting at 60% hitrate, no hit_for_pass. With no configuration change
aside from adding a single ban rule (which I have since removed) keyed
to a hostname the site runs (but which accounts for a tiny fraction of
the traffic), this has gone to 1% hitrate, 99% hit_for_pass. Headers
being sent out suggest caching is still behaving as expected but the shm
tools all report this high hit_for_pass rate. Looking at the number of
objects, there's now nothing but object heads in the store.

Any thoughts on what could be going on here?

--
Cheers,
James Harrison

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numard at gmail

Aug 1, 2013, 3:53 PM

Post #2 of 3 (41 views)
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Re: Sudden hit_for_pass [In reply to]

Has your backend code changed, and cookies or other headers being sent back
now?
On 01/08/2013 1:05 AM, "James Harrison" <james [at] talkunafraid> wrote:

> Hi,
>
> I have a varnish server sat in front of a website which was previously
> sitting at 60% hitrate, no hit_for_pass. With no configuration change
> aside from adding a single ban rule (which I have since removed) keyed
> to a hostname the site runs (but which accounts for a tiny fraction of
> the traffic), this has gone to 1% hitrate, 99% hit_for_pass. Headers
> being sent out suggest caching is still behaving as expected but the shm
> tools all report this high hit_for_pass rate. Looking at the number of
> objects, there's now nothing but object heads in the store.
>
> Any thoughts on what could be going on here?
>
> --
> Cheers,
> James Harrison
>
> _______________________________________________
> varnish-misc mailing list
> varnish-misc [at] varnish-cache
> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>

numard at gmail

Aug 6, 2013, 4:01 PM

Post #3 of 3 (25 views)
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Re: Sudden hit_for_pass [In reply to]

Please make sure you CC the list ;-)
On 07/08/2013 1:38 AM, "James Harrison" <james [at] talkunafraid> wrote:

> On 01/08/13 23:53, Norberto Meijome wrote:
> > Has your backend code changed, and cookies or other headers being sent
> > back now?
> >
>
> No.
>
> In addition to this sudden increase in hit_for_pass, my monitoring of
> uptime is now showing a flat line at 23675208.05 days, transfer rates
> are in the kilobytes rather than the usual 180M, and apparently I've got
> 1.8 million worker threads running. This all seems a bit unlikely, to
> say the least, so I'm thinking shm bug or something along those lines?
>
>
> --
> Cheers,
> James Harrison
>

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