[wp-trac] [WordPress Trac] #43112: set_transient uses object-cache as storage instead of cache layer

[WordPress Trac]

#43112: set_transient uses object-cache as storage instead of cache layer
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 Reporter:  batooo       |       Owner:
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  Awaiting Review
Component:  Cache API    |     Version:  4.9.1
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by batooo):

 Not a solution as you said, "Disadvantage is that you can use that only in
 your own code for your own caches, other transients will still be saved in
 object cache only.".

 About slow loading or high CPU, imagine 10 external API requests each time
 PHP is restarted or imagine doing some CPU intense job each time PHP is
 restarted instead of every 24 hours.

 What`s the point of using object-cache as storage when transient was
 designed becouse of extra element "expire time"?

 Replying to [comment:1 dimadin]:
 > If you want to have “persistent” transients, than there are libraries
 that you can use to save temporary data in database instead of in object
 cache. For example, my own [https://github.com/dimadin/wp-temporary
 WP_Temporary], or newly released [https://github.com/10up/Async-Transients
 Async Transients].
 >
 > In case of `WP_Temporary`, you would use `WP_Temporary::set( $transient,
 $value, $expiration );` instead of `set_transient( $transient, $value,
 $expiration );`. Advantage here is that even if object cache is purged for
 whatever reason, your data is still available from database until it
 expires. Disadvantage is that you can use that only in your own code for
 your own caches, other transients will still be saved in object cache
 only. You can code workaround to force that data in database too, but I am
 not sure will it degrade performance for some cases.
 >
 > > Using APCu as an object-cache which is a PHP in-process storage leads
 to high CPU and very slow loading time.
 >
 > I am not sure what you want to say with this, but note that when you
 turn on object caching, many other data is stored there, not just
 transients, post objects, taxonomy terms, comments, users, queries etc.

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Ticket URL: <https://core.trac.wordpress.org/ticket/43112#comment:2>
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