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Improve performance of trackback query in do_all_pings().

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Previously, the direct SQL query used to identify trackbacks in
`do_all_pings()` performed poorly, due to an unindexed query against the
`to_ping` column. We improve performance in two ways. First, we switch
to using a postmeta flag for posts that require trackbacks to be sent;
queries joining against the postmeta table that check only the `meta_key`
are generally quite fast. Second, we switch to the use of `WP_Query`,
making the query cacheable and filterable using standard methods.

Props dshanske, spacedmonkey, janw.oostendorp, mrmadhat, birgire.
Fixes #36824.
Built from https://develop.svn.wordpress.org/trunk@46178


git-svn-id: http://core.svn.wordpress.org/trunk@45990 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Boone Gorges
2019-09-19 02:06:56 +00:00
parent aa7d063af2
commit da8a602ad6
3 changed files with 21 additions and 8 deletions
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22
wp-includes/comment.php
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@@ -2665,15 +2665,23 @@ function do_all_pings() {
do_enclose( null, $enclosure->ID );
}
// Do Trackbacks
$trackbacks = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'" );
if ( is_array( $trackbacks ) ) {
foreach ( $trackbacks as $trackback ) {
do_trackbacks( $trackback );
}
// Do trackbacks.
$trackbacks = get_posts(
array(
'post_type' => get_post_types(),
'suppress_filters' => false,
'nopaging' => true,
'meta_key' => '_trackbackme',
'fields' => 'ids',
)
);
foreach ( $trackbacks as $trackback ) {
delete_post_meta( $trackback, '_trackbackme' );
do_trackbacks( $trackback );
}
//Do Update Services/Generic Pings
// Do Update Services/Generic Pings.
generic_ping();
}