[Koha-bugs] [Bug 16068] New: System preference override feature (OVERRIDE_SYSPREF_* = ) is not reliable for some cache systems

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16068

            Bug ID: 16068
           Summary: System preference override feature (OVERRIDE_SYSPREF_*
                    = ) is not reliable for some cache systems
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5 - low
         Component: Architecture, internals, and plumbing
          Assignee: gmcharlt at gmail.com
          Reporter: abl at biblos.pk.edu.pl
        QA Contact: testopia at bugs.koha-community.org

It is possibile in Koha to 'override' system preference values stored in the
database, by setting environment variables (export OVERRIDE_SYSPREF_... = ...
in shell, web server config file etc.). After Bug 11998, this feature may work
unreliably when used in combination with shared/permanent caching systems
(memcache, fastmmap) implemented in Koha::Cache currently.

- if the system preference is already stored in shared cache in the moment when
(some) other script will try to override it, such override will seemingly have
no effect for that script
- if the preference is not (yet) in the shared cache, and some script overrides
it "for it's own purpose", this override will get propagated to the shared
cache, and may unintentionally affect other scripts from now on

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