[wp-trac] [WordPress Trac] #33571: Improvements for plugin upgrades when disk space runs out (or other write failure)

[WordPress Trac]

#33571: Improvements for plugin upgrades when disk space runs out (or other write
failure)
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 Reporter:  DavidAnderson    |       Owner:  francina
     Type:  defect (bug)     |      Status:  assigned
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Upgrade/Install  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by DavidAnderson):

 This ticket is still needed. The root problem that WordPress plugin
 updates aren't atomic still remains. Consequently, when performing a
 plugin update, you are likely to get fatal errors because only half the
 plugin is present, during the unzip process. On any large site where
 visits are continual, any plugin update operation has a reasonable chance
 of causing fatal errors to be logged. Any developer of a sufficiently-
 popular plugin will see support requests from users who've received
 WordPress's email from the fatal error detector, during a plugin update,
 as a result of fatal errors whilst files were still being unzipped.

 So, to be clear: yes, it's rarer now to see plugin updates that are left
 in a half-finished. But, because the method is still unchanged, it's still
 possible to have fatal errors and user confusion and support requests
 because of site visits that happen during the process itself. The affected
 requests could be anything (checkout completions, background cron tasks,
 etc.).

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Ticket URL: <https://core.trac.wordpress.org/ticket/33571#comment:14>
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