id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
15854,get_users/WP_User_Query is not scalable,duck_,,"Related: #15786, #14572

Use of get_users (and by extension WP_User_Query) is not scalable for sites with a large number of users. Fatal errors occur when caching all the resulting users to memory.

Example usage which causes fatal errors in 3.1 (no fatal error in 3.0.3 for a site with even more users):

 - Deleting a user ([http://core.trac.wordpress.org/browser/trunk/wp-admin/users.php#L175 wp-admin/users.php line 175])
 - XML-RPC request for wp.getAuthors ([http://core.trac.wordpress.org/browser/trunk/wp-includes/class-wp-xmlrpc-server.php#L766 wp-includes/class-wp-xmlrpc-server.php line 783])
 - Creating a network ([http://core.trac.wordpress.org/browser/trunk/wp-admin/includes/schema.php#L632 wp-admin/schema.php line 670])
 - wp_list_authors ([http://core.trac.wordpress.org/browser/trunk/wp-includes/author-template.php#L271 wp-includes/author-template.php line 287])
 
And probably others, grep for `get_users`.

Patches for first to examples attached, but I can't help but feel this is just papering over the issue.",defect (bug),closed,highest omg bbq,3.1,General,3.1,blocker,fixed,has-patch commit,