Great answers.
Here is a follow up question though: I edited a template used in thousands
of pages, yet the Job Queue for that wiki did NOT increase by a factor of
thousand. It simply increased from around 10 to around 30. And since then
(several days ago), the associated page links are not updated. I understand
that Job Queue is not easy to comprehend, but can you shed a light as to
why the job queue only grow that much, and why the links haven't been
updated since? (Note that job queue very quickly shrank to 10 or so again).
On Sun, May 24, 2015 at 8:47 AM, John <phoenixoverride(a)gmail.com> wrote:
When editing a template the resulting link updates go
thru the Job Queue
https://www.mediawiki.org/wiki/Manual:Job_queue which has a lot of
variables which determine the speed that jobs get executed.
When you perform a null edit the page is reparsed, resulting in updates to
the link related tables (iwlink, external_links, page_links ect) which is
what the whatlinks here results. Normally the job queue forces a reparse as
needed.
a standard purge does not update the table, however a forcelinkupdate added
to the purge URL will achieve the same thing see
https://www.mediawiki.org/wiki/Manual:Parameters_to_index.php#Actions
As for job queue numbers, dont try and understand it, its a confusing mess.
A single job might affect many pages, might or might not spawn more jobs
and several other variable actions
On Sun, May 24, 2015 at 8:35 AM, Huji Lee <huji.huji(a)gmail.com> wrote:
I have a number of related questions regarding
MediaWiki's caching
mechanism. I would be grateful if one could answer these please. The
assumption here is that a wiki is configured using the exact same caching
methods that Wikimedia uses.
Please feel free to provide links to
https://www.mediawiki.org as well
as
https://noc.wikimedia.org when specifying
configuration variables in
your
answers as I am sure this would benefit future
readers of this thread as
well.
Q1: Page [[foo]] contains template {{bar}}. I edit that template, but the
page is not immediately updated. If I don't manually purge the cache of
that page, how long would it take for the page cache to be updated? Which
variable sets that time? And what is the value of that variable currently
at Wikimedia wikis?
Q2: Page [[foo]] contains template {{bar}}, and that template provides a
link to page [[norf]]. I edit the template such that it instead links to
page [[qux]]. However, when I go to Special:WhatLinksHere/norf I still
see
[[foo]] listed. Even if I try ?action=purge on
[[foo]], that behavior
doesn't change. The only way to change it is either to edit [[foo]] and
change its content, or to simply go to the edit page of [[foo]] and save
without changes.
Q2.A: If I don't do that null edit, how long would it take for the page
cache to be updated? Which variable sets that time? And what is the value
of that variable currently at Wikimedia wikis?
Q2.B: Why is it that ?action=purge doesn't update the pagelinks table?
Q2.C: Why is it that saving a page without any edits triggers any update
mechanism? (I would assume it'd be less costly overall to say "if diff is
null, don't do anything at all"; this question is more philosophical: why
would we not like the quoted behavior?
Q2.D: Does the Special:WhatLinksHere results come from a cache? In other
words, if I query the database directly right after I change the template
(as mentioned in Q2) but before I do any null edits, would it still show
the old page link from [[foo]] to [[norf]]? Or would it show the correct
link from [[foo]] to [[qux]] while Special:WhatLinksHere is still showing
the old link?
Q2.E: Is it possible to induce the same "resolution" through API? That
is,
is it possible to try to save a page without any
changes to its content
via
API, and thereby forcefully update the page links
entries for that page?
Q3: Assume that 100 pages contain template {{bar}}, and that template
provides a link to page [[norf]]. I edit the template such that it
instead
links to page [[qux]]. Would that add any jobs to
the job queue? If yes,
how many? Should I expect 100 new jobs to be added, because 100 page
cache's need updating?
Thanks in advance,
Huji
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