[wp-trac] [WordPress Trac] #10274: Simplify options caching

[WordPress Trac]

#10274: Simplify options caching
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 Reporter:  ryan          |       Owner:  ryan
     Type:  defect (bug)  |      Status:  new 
 Priority:  normal        |   Milestone:  2.9 
Component:  Cache         |     Version:      
 Severity:  normal        |    Keywords:      
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 Instead of caching all options and their values to a big array, let's
 cache only the option names to an array and cache the values individually.
 The option name cache will be passed to wp_cache_get_multi() (which needs
 to be added) at startup to prime the option cache. Here's the flow.

 (List of option names cached to all_options)

 First page load:

 * wp_cache_get all_options * Nothing is cached to all_options, so query db
 for all option names and values * Loop over DB results, wp_cache_add each
 option and construct all_options list. * wp_cache_set all_options with the
 options list * Cache for each option is now primed via the wp_cache_adds.

 Next page load:

 * wp_get_get all_options * all_options has cached list of option names,
 pass those names to wp_cache_get_multi * get_multi does one memcached
 request for all options * cache is now primed for all options, each option
 in its own bucket, no need to query DB

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Ticket URL: <http://core.trac.wordpress.org/ticket/10274>
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