[wp-trac] [WordPress Trac] #37923: Introduce shared wp_blogmeta database table for multisite installation

[WordPress Trac]

#37923: Introduce shared wp_blogmeta database table for multisite installation
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 Reporter:  johnjamesjacoby                      |       Owner:
     Type:  feature request                      |  spacedmonkey
 Priority:  normal                               |      Status:  assigned
Component:  Networks and Sites                   |   Milestone:  4.9
 Severity:  normal                               |     Version:
 Keywords:  has-patch has-unit-tests needs-      |  Resolution:
  testing ms-roadmap                             |     Focuses:  multisite
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Comment (by spacedmonkey):

 In 37923.eachnetwork.diff the network option is only set in two places.
 First on a network upgrade, which is a reasonable thing to do. Second in
 the `is_site_meta_enabled` function.

 It also fixes the following condition.

 0. Upgrade to WP 4.9+
 0. Code calls get_site_meta
 0. Check is run, table is not found, option is set to 0.
 0. All following calls fail because check is set to 0.
 0. Upgrade is run, table is installed, network option is set 1.
 0. Following calls work, as table exists and check is correctly set.

 Site meta can be disabled by the filter `site_meta_supported`. Having it
 as a network option, just makes that a little easier. But if you want to
 disable the function on network, you can just do this.
 {{{#!php
 add_filter('site_meta_supported', function($enabled){
    $network = get_network();
    if($network->id == 2){
      $enabled = false;
    }
    return $enabled;
 });
 }}}

 Worth noting that global terms and ms_files_rewriting can be disabled per
 network.

 It also allows you to write a custom install script that installs the
 table and set the value to 1 on all networks. This makes it is easier for
 people running a large multisite setup.

 Like term meta, we will never to able to truly know that this table is
 installed.

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Ticket URL: <https://core.trac.wordpress.org/ticket/37923#comment:56>
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