[buddypress-trac] [BuddyPress] #4759: Group forum permalink after reply broken when using persistent object cache

[buddypress-trac]

#4759: Group forum permalink after reply broken when using persistent object cache
--------------------------------------+------------------------------
 Reporter:  wpdennis                  |       Owner:
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  Awaiting Review
Component:  Forums                    |     Version:  1.6.1
 Severity:  blocker                   |  Resolution:
 Keywords:  dev-feedback 2nd-opinion  |
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Comment (by wpdennis):

 Paul, it's the bundled version. I'm running a WP 3.5 multisite with
 subdomains. BP is sitewide activated.

 I think I just found something.

 The reason why new replies aren't visible, is that ''bb_cache_posts()''
 returns old ids by:
 {{{
 wp_cache_get( $key, 'bb_cache_posts_post_ids' )
 }}}

 The cached value is old. But in ''bb_insert_post()'' I've found:

 {{{
 wp_cache_flush( 'bb_forums' );
 wp_cache_flush( 'bb_query' );
 wp_cache_flush( 'bb_cache_posts_post_ids' );
 }}}

 So it should'nt be out dated, right? Digging deeper: ''wp_cache_flush()''
 calls ''flush()'' in object-cache.php from
 [http://wordpress.org/extend/plugins/memcached/ memcached]:

 {{{
 function flush() {
         // Don't flush if multi-blog.
         if ( function_exists('is_site_admin') ||
 defined('CUSTOM_USER_TABLE') && defined('CUSTOM_USER_META_TABLE') )
                         return true;

         $ret = true;
         foreach ( array_keys($this->mc) as $group )
                 $ret &= $this->mc[$group]->flush();
         return $ret;
 }
 }}}

 [http://codex.wordpress.org/WPMU_Functions/is_site_admin is_site_admin()]
 is deprecated but exists. Is it possible, that every wp_cache_flush fails
 in a multisite installation and that's the only reason for all issues?

-- 
Ticket URL: <https://buddypress.trac.wordpress.org/ticket/4759#comment:2>
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