See below for an extract of the discussion on the recurring disappearance of interface messages recently. It was a mistake for the discussion to unfold on an internal list, but it happened quite by chance, starting with an incident report and developing from there.
--- Ori Livneh o...@wikimedia.org ---------- Forwarded message ---------- From: Ori Livneh <o...@wikimedia.org> Date: Thu, Apr 10, 2014 at 1:23 AM Subject: Re: [Engineering] Localisation not working on MediaWiki.org To: "Brad Jorsch (Anomie)" <bjor...@wikimedia.org> Cc: Bryan Davis <bd...@wikimedia.org>, Development and Operations Engineers <engineer...@lists.wikimedia.org> On Tue, Apr 8, 2014 at 6:56 AM, Brad Jorsch (Anomie) <bjor...@wikimedia.org>wrote: > On Mon, Apr 7, 2014 at 9:37 PM, Bryan Davis <bd...@wikimedia.org> wrote: > >> The obvious change that caused this was that `mwversionsinuse >> --withdb` changed from returning "1.23wmf21=testwiki" to >> "1.23wmf21=test2wiki". This result is used within scap by the >> mw-update-l10n script to run the maintenance script that builds the >> ExtensionMessages file. In theory the exact wiki passed to `mwscript >> mergeMessageFileList.php --wiki=<WIKIDB>` shouldn't matter, but >> obviously there are now some circumstances where it does indeed >> matter. >> > > It looks to me like it has always mattered to an extent: the final result > from maintenance/mergeMessageFileList.php is the combination of extensions > loaded for the --wiki wiki (e.g. in CommonSettings.php) and the extensions > loaded by the script itself from the passed list of extensions. Hopefully > the latter is always a superset of the former so that turns out not to > matter. > Interface messages went missing again on wikidata.org. l10nupdate ran updates on cawikibooks, where $wmgUseWikibaseClient is false. The theory that the exact wiki shouldn't make a difference is pretty shaky. You should expect to run on testwiki and fail loudly if you can't. We should rethink our whole approach; I don't have any confidence in the architecture. What is especially damning is not so much the recurrence of failures as the way they were discovered (that is to say: by chance) and the hard time we have had reasoning about their cause and the state of localization on the cluster generally.
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