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. git-svn-id: https://develop.svn.wordpress.org/trunk@37285 602fd350-edb4-49c9-b593-d223f7449a82
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