Editing Manual/Job queue (section)

=== Deferred updates === <!--T:85-->
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<translate><!--T:82--> The ''deferred updates'' mechanism allows the execution of code to be scheduled for the end of the request, after all content has been sent to the browser.</translate>
<translate><!--T:135--> This is similar to queuing a job, except that it runs immediately instead of upto several minutes/hours in the future.</translate>

<translate><!--T:81--> <tvar name=1><code>DeferredUpdates</code></tvar> was introduced in MediaWiki 1.23 and received major changes during MediaWiki 1.27 and 1.28.</translate>
<translate><!--T:83--> The goal of this mechanism is speed up the web responses by doing less work, as well as to prioritise some work that would previously be a job to run as soon as possible after the end of the response.</translate>

<translate><!--T:136--> A deferrable update can implement <tvar name=1><code>EnqueueableDataUpdate</code></tvar> in order to be queueable as a Job as well.</translate>
<translate><!--T:137--> This is used by <tvar name=1><code>RefreshSecondaryDataUpdate</code></tvar> in core, for example, which means if the update fails for any reason, MediaWiki will fallback to queuing as a job and try again later as to fulfil the contract in question.</translate> 

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