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resetNotificationCount() from replica with no lag

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When notifications are being moderated, the unread count
for affected users has to be recalculated.

It was initially done using DB_SLAVE but it was leading
to inconsistent data since that database did not know
about recently deleted notifications.

It was changed to DB_MASTER but it potentially led
to too many queries on master.

This patch tries to wait for the replica to have
caught up with those changes and use it to update
the unread count for the affected users.

Bug: T93673
Change-Id: Ib4a845e82f686dd7ed807ab21a28490014b56604
This commit is contained in:
Stephane Bisson 2016-09-12 12:05:33 -04:00 committed by Aaron Schulz
parent 7f24836607
commit d7845da3f6
1 changed files with 14 additions and 8 deletions
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22
includes/controller/ModerationController.php
View file

@ -1,4 +1,5 @@
<?php
use MediaWiki\MediaWikiServices;
/**
* This class represents the controller for moderating notifications
@ -23,13 +24,18 @@ class EchoModerationController {
$affectedUserIds = $notificationMapper->fetchUsersWithNotificationsForEvents( $eventIds );
$eventMapper->toggleDeleted( $eventIds, $moderate );
/**
* Recompute the notification count for the
* users whose notifications have been moderated.
*/
foreach ( $affectedUserIds as $userId ) {
$user = User::newFromId( $userId );
MWEchoNotifUser::newFromUser( $user )->resetNotificationCount( DB_MASTER );
}
DeferredUpdates::addCallableUpdate( function () {
// This udate runs after than main transaction round commits.
// Wait for the events deletions to be propagated to replica DBs
$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
$lbFactory->waitForReplication( [ 'timeout' => 5 ] );
$lbFactory->flushReplicaSnapshots( __METHOD__ );
// Recompute the notification count for the
// users whose notifications have been moderated.
foreach ( $affectedUserIds as $userId ) {
$user = User::newFromId( $userId );
MWEchoNotifUser::newFromUser( $user )->resetNotificationCount( DB_REPLICA );
}
} );
}
}