Future of -spersistent (was: Threads in 4.0)

Per Buer perbu at varnish-software.com
Tue May 20 09:05:48 CEST 2014


On Mon, May 19, 2014 at 11:26 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <
> CAOXZevAPWdZFezc+saBAJSAv6yUjjKcQoK1dT2itrbRp2A_Z4g at mail.gmail.com>
> , Per Buer writes:
> >> > storage is a nice-to-have to avoid cold caches after restarts/crashes,
> >> > but 4.0 clearly needs some work before it goes anywhere near
> production.
> >>
> >> It sounds like you've upgraded to get persistent? Persistent is still
> >> experimental, just as it was in 3.0.
> >
> >Experimental is misleading, it makes it sound like the code has a future.
> I
> >think the persistence code is still there because nobody has bothered
> >disabling it yet.
> >
> >There is no work being done on the persistent. I doubt someone will pick
> it
> >up.
> There's no formal decision on the future of -spersistent, but if
> Varnish-Software has (also) given up on it, maybe we should make
> that decision right now and drop -spersistent before 4.0.1 ?
> Any input?

We've managed to make it run stable at some point. LRU is still missing and
the code still discards data by the silo and doesn't do any attempts of
salvaging usage data from the silos so the code is not well suited for
generic usage.

I think we should disable or remove it. If someone wants to pick up the
pieces we would be able to provide some guidance and patches so the person
could pick up where we left of.

 <http://www.varnish-software.com/> *Per Buer*
CTO | Varnish Software
Phone: +47 958 39 117 | Skype: per.buer
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Winner of the Red Herring Top 100 Global Award 2013
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