[wp-trac] [WordPress Trac] #15458: Lazy-load usermeta into the user object

[WordPress Trac]

#15458: Lazy-load usermeta into the user object
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 Reporter:  nacin                    |       Owner:
     Type:  enhancement              |      Status:  new
 Priority:  normal                   |   Milestone:  3.3
Component:  Performance              |     Version:
 Severity:  normal                   |  Resolution:
 Keywords:  has-patch needs-testing  |
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Comment (by ryan):

 > Those lines in WP_User::_init_caps() are somehow causing cache
 pollution.  wp_cache_get($id, 'users'), as done in get_userdata(), will
 sometimes return an object with the wp_xxx_capabilities property set (
 where xxx is the current blog id).  The value is an empty array.  This
 confuses get_blogs_of_user(), which sees that the property is set and
 mistakenly thinks the user belongs to the current blog.  Since the cache
 clones objects on set and get this is rather unexpected.  Removing the ref
 assignment avoids the problem.

 Tracked this down to a bug in a particular memcached backend.  The value
 was being properly cloned from the cache during get but then that clone
 was assigned right back into the cache.  Dumb.  Anyhow, not a core bug so
 disregard the previous comment.

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Ticket URL: <http://core.trac.wordpress.org/ticket/15458#comment:43>
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