invalidating (ban) a cache problematically, real life maximum?

[S Ahmed]

Per,

Confused, I thought ban and purge are the same thing now in varnish 3?

Varnish 3 uses the term ban and banning for what was known as purge and
purging in Varnish 2. They are the same.

   - Varnish 3 has a new function called purge; that did not exist in VCL
   in Varnish 2.
   - purge; is a much improved way of doing what was in Varnish 2 done
   using set obj.ttl = 0s;.


So when you said limiting ban's to 10-30 per second, you were referring to
a regex based way of removing an item from cache?

And a purge is a specific url?


On Wed, Oct 10, 2012 at 8:59 AM, Per Buer <perbu at varnish-software.com>wrote:

> Hi,
>
> On Wed, Oct 3, 2012 at 9:31 PM, S Ahmed <sahmed1020 at gmail.com> wrote:
>
>> I was reading:
>> https://www.varnish-software.com/static/book/Cache_invalidation.html
>>
>> My main question is, what sort of # of ban requests can one realistically
>> send to varnish to invalid caches? (individual items, not ranges etc.)
>>
>
> I would limit bans to maybe 10-30 per second, no more. Make sure they are
> lurker-friendly.
>
> Say a site like tumblr is using varnish, which has thousands and thousands
>> of blogs, and so many blog entries are being updated via comments etc.  How
>> realistic would sending 1K ban's be to varnish?
>>
>
> Sending 1k purges to Varnish would be no problem at all. Bans - I'm not
> sure that is a good idea.
>
>
>> Maybe I have misunderstood this, but I'm guessing their are ruby/java
>> client libraries that when content gets updated in a web application, I
>> could then send a request using the ruby/java client library to ban a
>> specific item from cache right?
>>
>> If there are client libraries, where can they be found?  I'm looking for
>> both ruby and java.
>>
>
> It might make sense to implement it yourself. It is dead simple and you
> don't need the complexities of a generic library.
>
> --
> Per Buer
> Phone: +47 21 98 92 61 / Mobile: +47 958 39 117 / Skype: per.buer
> *Varnish makes websites fly!*
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>
>
>
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