[wp-trac] [WordPress Trac] #57625: WP_Query cache memory leak

[WordPress Trac]

#57625: WP_Query cache memory leak
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 Reporter:  owi           |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Cache API     |     Version:
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:  performance
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Comment (by skithund):

 > There are other query caches that been in core for years, so is this
 such a problem now?

 You can see pretty clearly in my attached graph when we upgraded to WP 6.0
 on a busyish multisite WooCommerce installation. After couple of OOM
 hiccups on this site we added `WP_REDIS_CACHE_TTL` to WordPress and
 `maxmemory` to Redis as a quick-fix "eviction policy" to all our WP
 installations (200+).

 I still haven't found time to debug further what's the root cause for
 terms invalidating pretty much on every timed cron run. Possibly a badly
 behaving "Something for WooCommerce Pro" plugin.

 > There are 2 hard problems in computer science: cache invalidation,
 naming things, and off-by-1 errors.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57625#comment:12>
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