Memcached Object Cache
Multiple mc backends, delete not working as expected. (3 posts)

  1. joshua strebel
    Posted 3 years ago #

    When using more than 1 mc backend servers the delete operations seem to fail.

    On update/save post and other operations like approving comments it does not seem to be deleting the key properly. On page refresh after the POST (say post update) the same data is returned as if the memcached key was not deleted.

    When we were using 1 mc server in the pool it was fine, now with 3 servers it is no bueno.

    Using v 2.0.2 of the plugin and a salt like:
    define( 'WP_CACHE_KEY_SALT', md5(<some_unique_site_identifier>) );


  2. Matt Martz
    Plugin Author

    Posted 3 years ago #

    You might be getting bit by an incompatibility between the version of memcached you are running and the version of the pecl memcache extension that is in use.

    See: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=620258#23

    Somewhere on these forums I have detailed an explanation on what versions are needed for what.

  3. joshua strebel
    Posted 3 years ago #

    Thanks Matt.
    Will have my devops team dive into it.

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