Help:Job queue: Difference between revisions

In MediaWiki 1.6, a '''job queue''' was introduced to perform long-running tasks asynchronously. The job queue is designed to hold many short tasks using [[:en:batch processing|batch processing]]. Up to MediaWiki 1.16, an estimate of the length of the job queue was shown at [[Special:Statistics]]. By default, each time a request runs, one job is taken from the job queue and executed.

MediaWiki 1.6 adds a job to the job queue for each article using a template. Each job is a command to read an article, expand any templates, and update the link[[mw:pagelinks table|pagelinks table]] accordingly. So null edits are no longer necessary, although it may take a while for big operations to complete. This can help to ease strain on users.

During a period of low loads, the job queue might be zero. At Wikimedia, the job queue is, in practice, almost never zero. In off-peak hours, it might be a few hundred to a thousand. During a busy day, it might be a few hundred thousand (values of several million are no cause for alarm), but it can quickly fluctuate by 10% or more.<ref>{{citeCite web|url=httphttps://leuksmanbrionv.com/log/2008/04/22/so-whats-in-the-job-queue-anyway/ |title=leŭksman » Blog Archive » So what’swhat's in the job queue anyway? |publisherwebsite=Leuksman.com brionv|date=2008-04-22 |accessdate=20092019-10-3014|archive-date=2019-04-04|archive-url=https://web.archive.org/web/20190404042109/https://brionv.com/log/2008/04/22/so-whats-in-the-job-queue-anyway/|url-status=live}}</ref> Also as mentioned aboveFurthermore, several servers will have different estimates for this value so apparently more varying fluctuations can also be seen.

As of MediaWiki 1.17, job queue length can be retrieved via the API at httphttps://en.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=statistics (it is shown on the line labeled "jobs=").<ref>[[{{Cite web|url=https://www.mediawiki.org/wiki/Manual:Job_queue#Special:Statistics|title=mw:Manual:Job queue]]#Special:Statistics|website=MediaWiki|accessdate=2024-06-07|archive-date=2024-06-07|archive-url=https://web.archive.org/web/20240607093114/https://www.mediawiki.org/wiki/Manual:Job_queue#Special:Statistics|url-status=live}}</ref> On Wikipedia this value can come from one of several servers (three as of 2009) and so may fluctuate significantly.

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