[wp-trac] [WordPress Trac] #36621: Don't cache the results of wp_mkdir_p() in a persistent cache

[WordPress Trac]

#36621: Don't cache the results of wp_mkdir_p() in a persistent cache
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 Reporter:  barry                         |       Owner:  ocean90
     Type:  defect (bug)                  |      Status:  closed
 Priority:  normal                        |   Milestone:  4.5.1
Component:  Media                         |     Version:  4.5
 Severity:  major                         |  Resolution:  fixed
 Keywords:  has-patch commit fixed-major  |     Focuses:
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Changes (by ocean90):

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


Comment:

 In [changeset:"37286"]:
 {{{
 #!CommitTicketReference repository="" revision="37286"
 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.

 Merge of [37285] to the 4.5 branch.

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

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Ticket URL: <https://core.trac.wordpress.org/ticket/36621#comment:10>
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