Sharing a Memcached server between multiple WordPress sites (key problems)

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If you use Memcached as an object cache for your WordPress site and you have many sites sharing a Memcached instance you may encounter problems. All down to WordPress and the Memcached object cache plugin you use creating duplicate keys. The W3 Total Cache plugin has a problem with this and so does this Memcached plugin.

The dedicated Memcached plugin has some fixes for this but they aren’t yet pushed to the repo version of the plugin. So download the object-cache.php file directly from trunk/Trac.

This is another one of those blog posts that’s a reminder for my self as much as info for anyone else…

A support forum entry for that plugin problem and fix.

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