Question about refreshing expired cache in background

[Serhii Korobov]

Hi

2018-07-23 22:56 GMT+03:00 Guillaume Quintard <
guillaume at varnish-software.com>:

> Hi,
>
> 1. You already answer that one: you get a background fetch when obj.ttl <=
> 0 but obj.ttl + obj.grace > 0.
>
> 2. that just hasn't been implemented yet, if I'm not mistaken (that would
> be the softban feature)
>
> --
> Guillaume Quintard
>
> On Mon, Jul 23, 2018 at 2:16 AM, Serhii Korobov <greyhomeua at gmail.com>
> wrote:
>
>> Hi developers of Varnish
>>
>> I read information about Varnish 4 release ( https://varnish-cache.org/li
>> sts/pipermail/varnish-announce/2014-April/000696.html ) and found there
>> a new feature http://prntscr.com/k8dgfk . I need an information about
>> refreshing expired cache in background.
>>
>> As I know from developer guide, fetching new object in background thread
>> is available only in Grace Mode - http://book.varnish-software
>> .com/4.0/chapters/Saving_a_Request.html#grace-mode when object's ttl has
>> expired but grace period is not over yet.
>>
>> Here are my questions:
>> 1. When and how can I use background cache refreshing?
>> 2. Why Grace Mode and cache invalidation via "ban" command doesn't work
>> together?
>>
>> Thanks
>>
>>
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>>
>>
>
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