[Koha-bugs] [Bug 13193] New: Discussion: strategy for diagnosing memcache issues.

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

http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=13193

            Bug ID: 13193
           Summary: Discussion: strategy for diagnosing memcache issues.
 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: barton at bywatersolutions.com
        QA Contact: testopia at bugs.koha-community.org

In bug 13150, we came across the following error:

Can't use string ("") as a HASH ref while "strict refs" in use at
/usr/share/koha/lib/C4/Biblio.pm line 1635.

Ultimately, this was determined to be caused by a corrupted data structure
caused by memcache.

I would suggest creating an entry in a similar hash that contains a well known
string that could be checked upon entering any page. If the memcached copy
didn't match the well-known value, we would know that memcache is having
problems, and throw a warning of some sort, advising that memcache should be
re-started.

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