In Koha, the sip2_resource_last_modified key is updated any time the SIP config is edited from the SIP2 editor in the staff interface ( institutions, accounts, system preference overrides ).
If sip2_resource_last_modified is missing from memcached, Koha SIP emits "Couldn't find sip2_resource_last_modified, considering configuration not up to date" in the logs, and fetches the entire configuration from the database, *for each request*.
This causes SIP performance to drop significantly. In my production testing with 83 institutions and 171 accounts the login message response time dropped from 0.283 seconds to 2.899 seconds.
I think the solution is pretty simple. If there is a cache miss on sip2_resource_last_modified, SIP should load the config from database as it does already, but then it should also set sip2_resource_last_modified!
Test Plan:
1) Apply this patch
2) Prove t/db_dependent/Koha/SIP2/SIP2ModuleMigration.t
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@openfifth.co.uk>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
7dc223b30a