Comments in 4.6 can now be cached by a persistent object cache

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The ‘comment’ cache group was made non-persistent in [7986], to address the difficulty of reliable cache invalidation. This meant the comment cache values were only held for the current page load, and lost on reload or navigation. The comment APIAPI An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. has improved since WordPress 2.6, and cache is king.

In WordPress 4.6 the ‘comment’ cache group has been removed from the list of non-persistent cache groups, see [37613]. When comments are added, modified, or deleted we properly invalidate out of date cache values. You can now cache with confidence.

If you have a pluginPlugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party which modifies comment data directly please change them to make use of the various comment API functions or use clean_comment_cache().

Don’t miss out on this change. For more background on the change, see #36906.

#4-6, #comments, #dev-notes

programmin 12:41 am on July 27, 2016

Will this improve the case where having many thousands of comments pending (from an unprotected form for example) will cause out-of-memory fatal errors because it loads an array of all comments when trying to manage them on /wp-adminadmin (and super admin)/?
Luke Cavanagh 9:20 pm on November 7, 2016

@programmin

Not sure but using an object cache, will store that DB query regardless of type of the query. So if using an object cache like Memcached or Redis it should.

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