https://bugzilla.wikimedia.org/show_bug.cgi?id=65263

--- Comment #1 from Brad Jorsch <[email protected]> ---
On further review, I'm not sure whether the rapid file uploads are responsible
for the database overload leading to the disconnection (although the
reconnect-then-throw-exception behavior is still unpleasant). At the same time
I see many exceptions like the following:

 2014-05-13 16:16:49 mw1029 enwiki: [955fda5b]
/w/index.php?title=Special:Export&action=submit   Exception from line 1093 of
/usr/local/apache/common-local/php-1.24wmf3/includes/db/Database.php: DB
connection was already closed.
 #0 /usr/local/apache/common-local/php-1.24wmf3/includes/db/Database.php(3492):
DatabaseBase->query('COMMIT', 'DatabaseBase::c...')
 #1 /usr/local/apache/common-local/php-1.24wmf3/includes/db/Database.php(3477):
DatabaseBase->doCommit('DatabaseBase::c...')
 #2 /usr/local/apache/common-local/php-1.24wmf3/includes/db/Database.php(937):
DatabaseBase->commit('DatabaseBase::c...', 'flush')
 #3
/usr/local/apache/common-local/php-1.24wmf3/includes/db/LoadBalancer.php(870):
DatabaseBase->close()
 #4
/usr/local/apache/common-local/php-1.24wmf3/includes/specials/SpecialExport.php(395):
LoadBalancer->closeAll()
 #5
/usr/local/apache/common-local/php-1.24wmf3/includes/specials/SpecialExport.php(179):
SpecialExport->doExport('New York City??...', Array, false, false)
 #6
/usr/local/apache/common-local/php-1.24wmf3/includes/specialpage/SpecialPage.php(379):
SpecialExport->execute(NULL)
 #7
/usr/local/apache/common-local/php-1.24wmf3/includes/specialpage/SpecialPageFactory.php(503):
SpecialPage->run(NULL)
 #8 /usr/local/apache/common-local/php-1.24wmf3/includes/Wiki.php(285):
SpecialPageFactory::executePath(Object(Title), Object(RequestContext))
 #9 /usr/local/apache/common-local/php-1.24wmf3/includes/Wiki.php(596):
MediaWiki->performRequest()
 #10 /usr/local/apache/common-local/php-1.24wmf3/includes/Wiki.php(448):
MediaWiki->main()
 #11 /usr/local/apache/common-local/php-1.24wmf3/index.php(46):
MediaWiki->run()
 #12 /usr/local/apache/common-local/w/index.php(3):
require('/usr/local/apac...')
 #13 {main}

combined with many "too many connections" errors in dberror.log; apparently
someone was spamming Special:Export at the same time.

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