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Improve performance of trackback query in do_all_pings().

Browse Source 
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
View File

@ -2665,15 +2665,23 @@ function do_all_pings() {
do_enclose( null, $enclosure->ID ); do_enclose( null, $enclosure->ID );
} }
// Do Trackbacks // Do trackbacks.
$trackbacks = $wpdb->get_col( "SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'" ); $trackbacks = get_posts(
if ( is_array( $trackbacks ) ) { array(
foreach ( $trackbacks as $trackback ) { 'post_type' => get_post_types(),
do_trackbacks( $trackback ); '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(); generic_ping();
} }

5
wp-includes/post.php
View File

@ -6786,6 +6786,11 @@ function _publish_post_hook( $post_id ) {
} }
add_post_meta( $post_id, '_encloseme', '1' ); add_post_meta( $post_id, '_encloseme', '1' );
$to_ping = get_to_ping( $post_id );
if ( ! empty( $to_ping ) ) {
add_post_meta( $post_id, '_trackbackme', '1' );
}
if ( ! wp_next_scheduled( 'do_pings' ) ) { if ( ! wp_next_scheduled( 'do_pings' ) ) {
wp_schedule_single_event( time(), 'do_pings' ); wp_schedule_single_event( time(), 'do_pings' );
} }

2
wp-includes/version.php
View File

@ -13,7 +13,7 @@
* *
* @global string $wp_version * @global string $wp_version
*/ */
$wp_version = '5.3-alpha-46177'; $wp_version = '5.3-alpha-46178';
/** /**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema. * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.