Perhaps related to that issue where localization was rather wonky earlier today?

ml.wikisource, ml.wikiquote, ml.wiktionary also affected. Alias ഉ (for ഉപയോക്താവ് - user) worked on ml.wikibooks!

ഉ is indeed still defined in my.wikibooks namespace configuration as an alias for NS_USER, untouched since 2012.

This is not a configuration file issue.

praveenp: When did this still work as expected?

(In reply to comment #2)

ml.wikisource, ml.wikiquote, ml.wiktionary also affected. Alias ഉ (for
ഉപയോക്താവ് - user) worked on ml.wikibooks!

https://git.wikimedia.org/blame/operations%2Fmediawiki-config.git/HEAD/wmf-config%2FInitialiseSettings.php defines
'+mlwikibooks' => array(

		'ഉ' => NS_USER,

but even an old version (I checked a three weeks old one) did not define this NS_USER for any other ml sites than wikibooks, as Dereckson wrote in comment 3.

I don't know when was this last worked. Users only notified yesterday that Main Page is broken. I think nothing was wrong before that.

We had to manually edit templates like these to fix that:

https://ml.wikipedia.org/w/index.php?title=%E0%B4%AB%E0%B4%B2%E0%B4%95%E0%B4%82:%E0%B4%B5%E0%B4%BE%E0%B5%BC%E0%B4%A4%E0%B5%8D%E0%B4%A4%E0%B4%AF%E0%B4%BF%E0%B5%BD_%E0%B4%A8%E0%B4%BF%E0%B4%A8%E0%B5%8D%E0%B4%A8%E0%B5%8D/autopick&diff=prev&oldid=1878352

https://ml.wikipedia.org/w/index.php?title=%E0%B4%AB%E0%B4%B2%E0%B4%95%E0%B4%82:%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B4%A7%E0%B4%BE%E0%B4%A8%E0%B4%A4%E0%B4%BE%E0%B5%BE-%E0%B4%B8%E0%B4%B9%E0%B5%8B%E0%B4%A6%E0%B4%B0_%E0%B4%B8%E0%B4%82%E0%B4%B0%E0%B4%82%E0%B4%AD%E0%B4%99%E0%B5%8D%E0%B4%99%E0%B5%BE&diff=prev&oldid=1878349

Please see the bug 24601 also. However some aliases like 'Image' for 'File' namespace works in ml.wikipedia and other projects.

(In reply to comment #4)

but even an old version (I checked a three weeks old one) did not define this
NS_USER for any other ml sites than wikibooks, as Dereckson wrote in
comment 3.

That is because these aliases are defined in MediaWiki core [1]. They have been there for at least 12 months.

I set my local test wiki to Malayalam and the aliases work as expected. I have no idea why they are now not working on the WMF cluster.

[1] http://git.wikimedia.org/blob/mediawiki%2Fcore.git/69b684ecb10dbd37471ae90c37b3d959ccbdadbb/languages%2Fmessages%2FMessagesMl.php#L69

Sounds like a rebuildLocalisationCache SNAFU. Those are rare, and not well understood.

(In reply to comment #1)

Perhaps related to that issue where localization was rather wonky earlier
today?

I don't know about this. Are there details anywhere? Maybe Sam or someone else from Platform can force a localisation cache rebuild and scap that?

If possible please include these in configuration files in the meantime (like ഉ in ml.wikibooks - Comment 3). Too many pages / links are affected and so this issue is a clear inconvenience to users.

Some pages are still displaying correctly, although updating cache using ?action=purge would break them simply.

Regarding priority: this is a pretty big deal. If this was happening to enwiki you would easily have a mass of people screaming bloody murder.

@Brian: translatewiki.net has nothing to do with this as far as I can tell. There have not been changed in namespaces of MessagesMl.php recently. I've changed back to the previous summary, for lack of a better one.

IMO Platform really has to look into this. I don't know how to surface that any more here in bugzilla than by my previous comments, so I'll start poking outside of bugzilla now.

https://ml.wikipedia.org/w/api.php?action=query&meta=siteinfo&siprop=namespaces|namespacealiases gives this:

<api>

<query>
  <namespaces>
    <ns id="-2" case="first-letter" canonical="Media" xml:space="preserve">മീഡിയ</ns>
    <ns id="-1" case="first-letter" canonical="Special" xml:space="preserve">പ്രത്യേകം</ns>
    <ns id="0" case="first-letter" content="" xml:space="preserve" />
    <ns id="1" case="first-letter" subpages="" canonical="Talk" xml:space="preserve">സംവാദം</ns>
    <ns id="2" case="first-letter" subpages="" canonical="User" xml:space="preserve">ഉപയോക്താവ്</ns>
    <ns id="3" case="first-letter" subpages="" canonical="User talk" xml:space="preserve">ഉപയോക്താവിന്റെ സംവാദം</ns>
    <ns id="4" case="first-letter" subpages="" canonical="Project" xml:space="preserve">വിക്കിപീഡിയ</ns>
    <ns id="5" case="first-letter" subpages="" canonical="Project talk" xml:space="preserve">വിക്കിപീഡിയ സംവാദം</ns>
    <ns id="6" case="first-letter" canonical="File" xml:space="preserve">പ്രമാണം</ns>
    <ns id="7" case="first-letter" subpages="" canonical="File talk" xml:space="preserve">പ്രമാണത്തിന്റെ സംവാദം</ns>
    <ns id="8" case="first-letter" subpages="" canonical="MediaWiki" xml:space="preserve">മീഡിയവിക്കി</ns>
    <ns id="9" case="first-letter" subpages="" canonical="MediaWiki talk" xml:space="preserve">മീഡിയവിക്കി സംവാദം</ns>
    <ns id="10" case="first-letter" subpages="" canonical="Template" xml:space="preserve">ഫലകം</ns>
    <ns id="11" case="first-letter" subpages="" canonical="Template talk" xml:space="preserve">ഫലകത്തിന്റെ സംവാദം</ns>
    <ns id="12" case="first-letter" subpages="" canonical="Help" xml:space="preserve">സഹായം</ns>
    <ns id="13" case="first-letter" subpages="" canonical="Help talk" xml:space="preserve">സഹായത്തിന്റെ സംവാദം</ns>
    <ns id="14" case="first-letter" canonical="Category" xml:space="preserve">വർഗ്ഗം</ns>
    <ns id="15" case="first-letter" subpages="" canonical="Category talk" xml:space="preserve">വർഗ്ഗത്തിന്റെ സംവാദം</ns>
    <ns id="100" case="first-letter" subpages="" canonical="കവാടം" xml:space="preserve">കവാടം</ns>
    <ns id="101" case="first-letter" subpages="" canonical="കവാടത്തിന്റെ സംവാദം" xml:space="preserve">കവാടത്തിന്റെ സംവാദം</ns>
    <ns id="828" case="first-letter" subpages="" canonical="Module" xml:space="preserve">ഘടകം</ns>
    <ns id="829" case="first-letter" subpages="" canonical="Module talk" xml:space="preserve">ഘടകത്തിന്റെ സംവാദം</ns>
  </namespaces>
  <namespacealiases>
    <ns id="4" xml:space="preserve">WP</ns>
    <ns id="4" xml:space="preserve">Wikipedia</ns>
    <ns id="4" xml:space="preserve">വിക്കി</ns>
    <ns id="5" xml:space="preserve">വിക്കിസം</ns>
    <ns id="6" xml:space="preserve">Image</ns>
    <ns id="7" xml:space="preserve">Image talk</ns>
    <ns id="100" xml:space="preserve">Portal</ns>
    <ns id="101" xml:space="preserve">Portal talk</ns>
    <ns id="828" xml:space="preserve">ഘ</ns>
    <ns id="829" xml:space="preserve">ഘസം</ns>
  </namespacealiases>
</query>

</api>

MessagesMl.php contains this:

$namespaceNames = array(
NS_MEDIA => 'മീഡിയ',
NS_SPECIAL => 'പ്രത്യേകം',
NS_TALK => 'സംവാദം',
NS_USER => 'ഉപയോക്താവ്',
NS_USER_TALK => 'ഉപയോക്താവിന്റെ_സംവാദം',
NS_PROJECT_TALK => '$1_സംവാദം',
NS_FILE => 'പ്രമാണം',
NS_FILE_TALK => 'പ്രമാണത്തിന്റെ_സംവാദം',
NS_MEDIAWIKI => 'മീഡിയവിക്കി',
NS_MEDIAWIKI_TALK => 'മീഡിയവിക്കി_സംവാദം',
NS_TEMPLATE => 'ഫലകം',
NS_TEMPLATE_TALK => 'ഫലകത്തിന്റെ_സംവാദം',
NS_HELP => 'സഹായം',
NS_HELP_TALK => 'സഹായത്തിന്റെ_സംവാദം',
NS_CATEGORY => 'വർഗ്ഗം',
NS_CATEGORY_TALK => 'വർഗ്ഗത്തിന്റെ_സംവാദം',
);

$namespaceAliases = array(
'സം' => NS_TALK,
'അംഗം' => NS_USER,
'ഉ' => NS_USER,
'അംഗങ്ങളുടെ സംവാദം' => NS_USER_TALK,
'ഉസം' => NS_USER_TALK,
'ചി' => NS_FILE,
'ചിസം' => NS_FILE_TALK,
'ചിത്രം' => NS_FILE,
'ചിത്രത്തിന്റെ_സംവാദം' => NS_FILE_TALK,
'പ്ര' => NS_FILE,
'പ്രസം' => NS_FILE_TALK,
'ഫ' => NS_TEMPLATE,
'ഫസം' => NS_TEMPLATE_TALK,
'വി' => NS_CATEGORY,
'വ' => NS_CATEGORY,
'വിസം' => NS_CATEGORY_TALK,
'വസം' => NS_CATEGORY_TALK,
'മീ' => NS_MEDIAWIKI,
'മീസം' => NS_MEDIAWIKI_TALK,
'പ്രത്യേ' => NS_SPECIAL,
'വിഭാഗം' => NS_CATEGORY,
'വിഭാഗത്തിന്റെ_സംവാദം' => NS_CATEGORY_TALK,
'വർഗ്ഗം' => NS_CATEGORY,
'വർഗ്ഗത്തിന്റെ_സംവാദം' => NS_CATEGORY_TALK,
'സ' => NS_HELP,
'സസം' => NS_HELP_TALK,
);

And more namespaces come from http://noc.wikimedia.org/conf/highlight.php?file=InitialiseSettings.php:

'+mlwiki' => array(

		'വിക്കി' => NS_PROJECT,
		'വിക്കിസം' => NS_PROJECT_TALK,
		'Wikipedia' => NS_PROJECT,
		'WP' => NS_PROJECT,
		'Portal' => 100,
		'Portal_talk' => 101,

),

This, and the information from comment 6 indicate that there is an issue with the localisation cache at Wikimedia, as also mentioned as a suspicion in comment 7. My recommendation is to force a localisation cache rebuild for "ml" and to distribute that.

reedy@tin:/a/common/php-1.23wmf6/cache/l10n$ sudo -u l10nupdate mwscript rebuildLocalisationCache.php --wiki=mlwiki --outdir=/a/common/php-1.23wmf6/cache/l10n --threads=2 --lang=ml --force
Rebuilding ml...
1 languages rebuilt out of 1
reedy@tin:/a/common/php-1.23wmf6/cache/l10n$ ls l10n_cache-ml.cdb*
l10n_cache-ml.cdb l10n_cache-ml.cdb.old
reedy@tin:/a/common/php-1.23wmf6/cache/l10n$ ls -al l10n_cache-ml.cdb*
-rw-r--r-- 1 l10nupdate l10nupdate 3095899 Dec 11 16:23 l10n_cache-ml.cdb
-rw-r--r-- 1 l10nupdate l10nupdate 3098181 Dec 11 02:06 l10n_cache-ml.cdb.old

reedy@tin:/a/common/php-1.23wmf5/cache/l10n$ sudo -u l10nupdate mwscript rebuildLocalisationCache.php --wiki=mlwiki --outdir=/a/common/php-1.23wmf5/cache/l10n --threads=2 --lang=ml --force
Rebuilding ml...
1 languages rebuilt out of 1
reedy@tin:/a/common/php-1.23wmf5/cache/l10n$ ls -al l10n_cache-ml.cdb*
-rw-r--r-- 1 l10nupdate l10nupdate 3095899 Dec 11 16:31 l10n_cache-ml.cdb
-rw-r--r-- 1 l10nupdate l10nupdate 3095899 Dec 11 02:20 l10n_cache-ml.cdb.old

I think bug 54951 revert is deployed but still pages are broken because of cache. Is it possible to mass purge the entire cache (of all these wikis)?

@Praveenp: is this still occurring? if not, could you mark this bug RESOLVED FIXED please?

There are still broken pages. (eg: https://ml.wikipedia.org/wiki/%E0%B4%95%E0%B4%A3%E0%B5%8D%E0%B4%9F%E0%B4%82%E0%B4%95%E0%B5%81%E0%B4%B3%E0%B4%A4%E0%B5%8D%E0%B4%A4%E0%B4%BF_%E0%B4%86%E0%B4%B0%E0%B5%8D%E0%B4%AF%E0%B4%B5%E0%B5%88%E0%B4%A6%E0%B5%8D%E0%B4%AF%E0%B4%B6%E0%B4%BE%E0%B4%B2 ). It is possible to fix them by purging cache.

@Reedy: Can you have a look at it during today's deployment window, please? And merge https://gerrit.wikimedia.org/r/#/c/101889/ while at it? Thanks :-)

I've just manually purged the few hundred remaining pages, so that this issue should be fully resolved now.