[wp-trac] [WordPress Trac] #64696: Real time collboration effectively disables persistent post caches while anyone edits a post

[WordPress Trac]

#64696: Real time collboration effectively disables persistent post caches while
anyone edits a post
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 Reporter:  peterwilsoncc             |       Owner:  (none)
     Type:  defect (bug)              |      Status:  new
 Priority:  normal                    |   Milestone:  7.0
Component:  Posts, Post Types         |     Version:  trunk
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by spacedmonkey):

 Sorry for the ping, but I would like eyes on my
 [https://github.com/WordPress/wordpress-develop/pull/11427 PR].
 @davidbaumwald @peterwilsoncc @westonruter @zieladam

 TDLR of the PR, it keep the last changed group changing on clean post
 cache / update / add delete post meta, to maintain backwards compatiblity
 with third parties code that is use this cache key for invalidation /
 salts. But with the core base use two new last changed caches, one for
 post-queries and one for post meta.

 So to be clear.
 - Post - last changed is updated when both posts and meta are updated.
 - Post-queries - last changed is updated when posts are updated.
 - Post-meta - last changed is updated when meta is updated.

 If this change works for posts, we should roll this out to other query
 classes.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64696#comment:144>
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