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From Branko Čibej <br...@wandisco.com>
Subject Re: Looking to dump/load with minimal repository downtime
Date Tue, 19 Aug 2014 17:08:03 GMT
On 19.08.2014 17:55, Eric Johnson wrote:
> Thanks for the excellent answers to my question! One more comment and
> question below.
>
> On Tue, Aug 19, 2014 at 12:05 AM, Branko Čibej <brane@wandisco.com
> <mailto:brane@wandisco.com>> wrote:
>
>     Just remember to always restart the server after switching from
>     the old to the new repository to remove stale caches. (Yes, we're
>     currently working on making that mostly unnecessary in 1.9.)
>
>
> What are these caches? I've got memcached turned off for these (fsfs)
> repositories. What, exactly, do I need to restart? All client access
> is via HTTP. Restarting Apache for each of my repository updates would
> be unfortunate, because I want to keep the number of times I bounce
> the server to a low value, even if it does only take 3s to restart.

These are in-process caches, specific to each individual HTTPd worker
process. They have to be purged because otherwise a worker that's
serving the repository while you make the switch may return stale
information to clients -- possibly breaking working copies in the
process. It's enough to do a graceful restart (apachectl graceful) when
you switch the repository; this will restart the worker processes
without actually making your server inaccessible.

-- Brane


-- 
Branko Čibej | Director of Subversion
WANdisco | Realising the impossibilities of Big Data
e. brane@wandisco.com

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