Cache survived varnish restart?

Guillaume Quintard guillaume at
Mon Oct 31 10:21:00 CET 2016

I don't think that's possible :-) That would be nice though.

Guillaume Quintard

On Thu, Oct 27, 2016 at 8:41 PM, CJ Ess <zxcvbn4038 at> wrote:

> I saw something today that I can't explain - I upgraded Varnish 4.1.0 to
> v4.1.3 by restarting varnishd on a server. I can see that inode of the
> executable and libraries are right for the updated files in the running
> varnishd via /proc/<pid>/maps (on Linux), I can see that no other varnishd
> processes are running. I expected that restarting varnish would cause the
> cache to be wiped and require some period of warmup, however the hit rate
> held steady at 98% and I don't know why.
> I'm very happy to be able to do this, its going to make the rest of my
> upgrades non-disruptive, but I'd like to be able to explain whats happening
> behind the scenes. Can anyone tell me how the cache seemed to survive the
> restart?
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