Cannot figure out why I am getting a miss on a static URL

[Dridi Boukelmoune]

On Fri, Jan 16, 2015 at 4:21 PM, Viktor Gunnarson
<viktor.gunnarson at ericsson.com> wrote:
> Have you tried logging the requests that get misses? Perhaps that could give
> some additional info.
>
>
>
> varnishlog -q "VCL_call ~ 'MISS'"

Nope, he's using Varnish 3.

> Also you could provide the vcl because without that it’s really hard to know
> what happens...
>
>
>
> Best regards,
>
> Viktor
>
>
>
>
>
> From: varnish-misc-bounces+viktor.gunnarson=ericsson.com at varnish-cache.org
> [mailto:varnish-misc-bounces+viktor.gunnarson=ericsson.com at varnish-cache.org]
> On Behalf Of Jennings III, Raymond
> Sent: den 16 januari 2015 16:07
> To: Dridi Boukelmoune
> Cc: varnish-misc
> Subject: Re: Cannot figure out why I am getting a miss on a static URL
>
>
>
> varnishncsa clearly shows hits and misses within a 24 hour period despite
> clearly setting the TTL to 24 hours.  Varnishlog clearly shows the TTL being
> set to 24 hours.  I have NO lru_nuked objects as clearly shown by the
> varnish stats.
>
>
>
> I'm not sure what is vague.  I am setting an object for a TTL of 24 hours
> yet during that 24 hour period it is still getting miss requests.  The URLs
> in question have no GET parameters.  I am hashing only on the URL and not
> the hostname.
>
>
>
> So what does this tell me?  It tells me that my cache size is big enough.
>
>
>
> My guess is there is some type of contention from locking of some type given
> other requests coming through.  There are quite a few PUT and POST requests
> that pass through this Varnish server.
>
>
>
> Ummmm, I hardly think that "anyone can't help me."  I think most definitely
> "someone" that has some insight about the internals could shed some light on
> this problem.
>
>
>
>
>
>
> Raymond Jennings III
>
> nytimes.com
>
> Office: 212.556.7786
>
> iPhone: 914.330.5074
>
> E-mail: Raymond.Jennings at nytimes.com
>
> FaceTime: Raymond.Jennings at nytimes.com
>
>
>
> On Fri, Jan 16, 2015 at 10:01 AM, Dridi Boukelmoune
> <dridi.boukelmoune at zenika.com> wrote:
>
> Hi Raymond,
>
> Have you looked at the logs?
>
> Your description of the issue is too vague, I don't think anyone can
> help you with just that.
>
> Cheers,
> Dridi
>
>
> On Thu, Jan 15, 2015 at 3:36 PM, Jennings III, Raymond
> <raymond.jennings at nytimes.com> wrote:
>> I have a static URL that I set a TTL for 24h but yet every so many minutes
>> I
>> get a "miss" (as shown in my varnishncsa.)
>>
>> I purge this URL every 24 hours.
>>
>> 1 - The URL never has any parameters.
>> 2 - I do not hash over the hostname only the URI
>> 3 - Nobody is issuing any PURGE or BAN requests
>> 4 - n_lru_nuked is always 0
>> 5 - There are no 500 or 400 responses
>>
>> What is causing this URL to get a miss when everything I see looks good?
>> If
>> the cache size has been exceeded I would have expected to see the nuked
>> value be something other than 0.
>>
>> vcl_fetch is basically just:
>>
>> set beresp.ttl = 24h;
>> return(deliver);
>>
>> Any reason why Varnish seems to be taking it upon itself to cause this
>> miss?
>> In 24 hours I get about 12000 requests and out of those 120 misses and I
>> should see 2 miss requests at most.
>>
>> The backends are healthy.
>>
>> This is varnish-3.0.6-1.el6.x86_64
>>
>> Thanks.
>>
>>
>>
>> Raymond Jennings III
>> nytimes.com
>> Office: 212.556.7786
>> iPhone: 914.330.5074
>> E-mail: Raymond.Jennings at nytimes.com
>> FaceTime: Raymond.Jennings at nytimes.com
>>
>
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>
>