Cache tagging and invalidation support

[davidstrauss]

Extend the cache API to support tagging items and invalidating items with a certain tag. This work should ideally be coordinated with D8.

[fabsor]

I guess http://drupal.org/project/cachetags should be highly interesting for this. The project maintains a patch that adds another paramter to the cache_set/get functions, tags:
http://drupalcode.org/project/cachetags.git/blob/refs/heads/7.x-1.x:/cachetags.patch

There is also a patch that takes an alternate approach, it makes the cache.inc pluggable as it was in Drupal 6 in order to implement this:
http://drupal.org/node/1341306