[wp-trac] [WordPress Trac] #29247: Crucial caches are not cleared when deleting site

[WordPress Trac]

#29247: Crucial caches are not cleared when deleting site
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 Reporter:  rmccue        |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Cache API     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:  multisite     |
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 `clean_blog_cache` clears a bunch of caches, but does not clear any of the
 options caches. The worst of these is the `alloptions` cache, which allows
 some behaviour to continue working on deleted sites.

 For example, `switch_to_blog` will continue to work without error, whereas
 if the cache is cleared, a `Table 'wordpress.{$prefix}_options' doesn't
 exist` error will be generated (helping in debugging).

 Another one that's problematic is the `is_blog_installed` cache.

 On that note, is there a reason we aren't checking site existence in
 `switch_to_blog`?

 (Still investigating this one.)

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Ticket URL: <https://core.trac.wordpress.org/ticket/29247>
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