https://bugzilla.wikimedia.org/show_bug.cgi?id=56439

--- Comment #6 from Nemo <federicol...@tiscali.it> ---
I wonder if this has to do with insufficient caching: if we're hammering the
localisation cache in MySQL for hundreds revisions per second, I wouldn't be
surprised that something goes wrong.
In an instance set up by role::mediawiki-install::labs , I now uncommented
  $wgCacheDirectory = "$IP/cache";
and
  php maintenance/rebuildLocalisationCache.php --force
took only few seconds instead of minutes because it uses CDB files (I first
checked write permissions in cache/ directory, owned by www-data rather than
root).
From a cursory view of top, it seems that now the php process running
importDump is as busy as before, but mysqld is one order of magnitude less
loaded.

(In reply to Yuvi Panda from comment #3)
> Also affects testwikidatawiki

What caching system did it use?

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