[Koha-bugs] [Bug 9005] Changing sysprefs requires restart under Plack

[bugzilla-daemon at bugs.koha-community.org]

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=9005

--- Comment #6 from Paul Poulain <paul.poulain at biblibre.com> ---
(In reply to comment #5)
> (In reply to comment #4)
> > This patch can solve a bugguy behaviour at the price of loosing a very
> > interesting cache feature.
> 
> No, it doesn't. It solves a major bug with no side-effects for systems that
> aren't affected by the bug. It is 100% opt-in.
I feel that libraries that are changing sysprefs *sometimes* will complain. And
we must find a generic way to solve the "rare change of datas", or we won't be
able to add more caching. For example, we could store in a global/"static"
variable the issuingrules, to avoid reading them on each checkin. But if they
are changed, how the librarian administrator will be able to propagate it on
Plack ?

investigating the documentation, I find : https://github.com/miyagawa/Starman
that says :

Starman is a PSGI perl web server that has unique features such as:
    Signals
        Supports "HUP" for graceful worker restarts, and "TTIN"/"TTOU" to
        dynamically increase or decrease the number of worker processes, as
        well as "QUIT" to gracefully shutdown the worker processes.

wouldn't a page/link in the admin section that "reload" the server at user
request be useful ?

> > What could be the long-term one ?
> > Is there a proper way to tell Plack that he must restart all his childs ?
> 
> This seems like a bad idea from a security standpoint.
Why is it a bad idea ?

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