[wp-trac] [WordPress Trac] #4476: Delete Cache by Group

[WordPress Trac]

#4476: Delete Cache by Group
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 Reporter:  filosofo         |       Owner:
     Type:  enhancement      |      Status:  reopened
 Priority:  normal           |   Milestone:
Component:  Cache API        |     Version:  2.2
 Severity:  normal           |  Resolution:
 Keywords:  has-patch close  |     Focuses:
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Changes (by Ste_95):

 * status:  closed => reopened
 * resolution:  wontfix =>


Comment:

 Why hasn't this received any more attention? I still think it's relevant.
 The invalidation method posted by @scribu is good with memcached, but not
 if cached data goes to the database as a transient:

   It is important to note that if you are not careful about how you are
 using this design pattern, you could accidentally consume all of your
 cache storage space. This strategy relies on changing the key that is used
 to access the cached object; it never removes the previously cached
 versions of the objects. It leaves it in the cache's storage. If your
 caching backend relies on a caching technology that does not automatically
 handle cache evictions, you may completely fill that storage. I tend to
 work with memcached on large projects that need efficient caching.
 Memcached implements an aggressive (sometimes way too aggressive) eviction
 policy whereby cached objects are frequently removed from cache. You can
 change the keys for the cached objects and the older objects will be
 removed from the cache, making room for newer versions of the objects. As
 such, the incrementor invalidation strategy is an effective tool in a
 memcached environment.
 [https://www.tollmanz.com/invalidation-schemes/]

 Why not implement the patch from @filosofo. Or at least provide a method
 to access the $cache class var, so that we could iterate through the
 category array and manually delete each key.

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Ticket URL: <https://core.trac.wordpress.org/ticket/4476#comment:12>
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