[Koha-bugs] [Bug 16140] Only clear L1 cache when needed

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

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16140

--- Comment #1 from Jesse Weaver <jweaver at bywatersolutions.com> ---
Created attachment 49487
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https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=49487&action=edit
Bug 16140: Only clear L1 cache when needed

By storing a modification time in memcached, we can check the upstream
cache at the start of every request, and only clear the L1 cache if the
upstream has actually been modified.

This and the following patch get noticeable performance improvements on
top of bug 16044: ~1.2 vs 2.2 seconds for a search on a small dataset.

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