[wp-trac] [WordPress Trac] #27470: added a WP_Feed_Cache_Memcache client using memcache as backend

[WordPress Trac]

#27470: added a WP_Feed_Cache_Memcache client using memcache as backend
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 Reporter:  Wei Feng     |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Widgets      |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Hi,

 (this has been posted to github as
 https://github.com/WordPress/WordPress/pull/74)

 Some background on this change. So we have a multiple server setup -- one
 backend server and couple of frontend servers all with wordpress
 installed. To make it secure, only backend server can write to wordpress
 database and all the frontend servers are read-only. And wp-admin etc has
 been removed from all the frontend servers.

 This setup runs fine in most of the cases (wp-cron is an exception but we
 have disabled it), until we added the RSS widget to sidebar. It seems the
 widget keeps last access time in wp_options table but in our setup
 frontend server cannot write to database:

 {{{
 WordPress database error UPDATE command denied to user
 'blogro'@'12.34.56.78' for table 'wp_options' for query UPDATE
 `wp_options` SET `option_value` = ...
 }}}

 So I have modified the WP_Feed_Cache a little bit, when MEMCACHE_SERVER is
 defined, use WP_Feed_Cache_Memcache to cache the RSS last access time in
 memcache instead of DB.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27470>
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