Member's group / friends totals incorrect on memcached

[DJPaul]

When memcached, if a user joins a group, the group joined total in the subnav is incorrect, and stays incorrect, until memcached is flushed. This affects 1.2 all the way up to trunk.

The same problem happens for the number of friends count in the subnav, and I'd suspect the other counts might have the same problem, but I have not tested these.

[DJPaul]

problem

[shanebp]

I've confirmed that we have memcached and apc installed and working.

I did not install ​http://wordpress.org/extend/plugins/apc/ or any other caching plugins.

I cannot recreate this problem on a trunk-6068 install.

[r-a-y]

Replying to shanebp:

I've confirmed that we have memcached and apc installed and working.

I did not install ​http://wordpress.org/extend/plugins/apc/ or any other caching plugins.

I cannot recreate this problem on a trunk-6068 install.

I'm guessing that DJPaul has an object caching plugin installed like ​this one. You need to have an object cache plugin installed for persistent caching to take effect in WP/BP.

[shanebp]

Ok, installed ​http://wordpress.org/extend/plugins/apc/
and now I can confirm this bug on a trunk-6068 install.
I see the bug on Groups and Friends, joining and leaving.

On a production site using BP 1.5.5 and W3 Total Cache with object cache enabled,
I can confirm this bug.
Emptying the object cache via wp-admin results in the subnav showing the correct number.

[djpaul]

(In [6100]) When a group is created or deleted, clear each group member's "total groups count" cache.
Addresses a bug where the counts never changed in an environment with a persistent object cache.

• See #4226
• Specify cache group for to wp_cache_delete() in groups_clear_group_user_object_cache().
• Add $user_ids parameter to the 'bp_groups_delete_group' action to save a repeat DB query later.
• Add $group object parameter to the 'groups_created_group' action.

[djpaul]

(In [6101]) Prevent a user's "total friends" count from not being cleared from a persistent object cache.

• Removed redundant BP wp_cache use as WP user meta has its own caching built-in.
• Fixes #4226