[Koha-bugs] [Bug 16758] New: Caching issues in scripts running in daemon mode

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16758

            Bug ID: 16758
           Summary: Caching issues in scripts running in daemon mode
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          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

As L1 cache does not have expiration mechanism, scripts running in daemon mode
(rebuild_zebra.pl -daemon, sip server ?, ...) would not be aware of any
possible 
changes in the data being cached in Koha::Cache.

While adding expiration functionality to Koha::Cache would be pretty simple, I
guess we don't really want to expire things by default after a given amount of
seconds, that would not be good for overall performance; default expiration
time for L2 = memcached is infinite (intentionally). Note that it's also
infinite for L2 = Cache::Memory - probably not intentional, more likely that's
because this code

    # Default cache time for memory is _always_ short unless it's specially
    # defined, to allow it to work reliably in a persistent environment.
    my $cache = Cache::Memory->new(
        'namespace'       => $self->{'namespace'},
        'default_expires' => "$self->{'timeout'} sec" || "10 sec",
    );

doesn't work as advertised. That might be a problem for plack + Cache::Memory
setups - hopefully nobody uses such weird combos. Anyway, that belongs to the
separate bug report.

I wonder what would be a best approach for solving this issue for perpetually
running scripts? Maybe just adding a function to Koha::Cache which flushes L1
cache (but not more often then each 10 | 20 | 30 seconds), and call it in
rebuild_zebra.pl etc. daemon loop  - ?

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