[wp-trac] [WordPress Trac] #34359: Cache output of `wp_upload_dir()` to improve performance

[WordPress Trac]

#34359: Cache output of `wp_upload_dir()` to improve performance
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 Reporter:  mikeschroder                   |       Owner:  azaozz
     Type:  defect (bug)                   |      Status:  closed
 Priority:  normal                         |   Milestone:  4.5
Component:  Media                          |     Version:
 Severity:  normal                         |  Resolution:  fixed
 Keywords:  needs-testing has-patch early  |     Focuses:  multisite,
                                           |  performance
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Comment (by ocean90):

 In [changeset:"37285"]:
 {{{
 #!CommitTicketReference repository="" revision="37285"
 Media: Don't cache the results of `wp_mkdir_p()` in a persistent cache.

 To improve the performance of `wp_upload_dir()` the result of
 `wp_mkdir_p()` was stored in a persistent cache, introduced in [36565].
 But this becomes an issue when WordPress is scaled horizontally. You may
 end up caching a value for a server where the directory doesn't exist
 which will prevent further uploads on other servers because of the
 persistent cache.
 The fix is to use a non-persistent cache.

 Props azaozz, ocean90.
 See #34359.
 Fixes #36621.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/34359#comment:63>
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