Thanks all for thinking along. 

We have found the cause of the unbelievable growth in page views, and it turns 
out to be an bug indeed.

Around August 2013 a site change caused internal housekeeping messages to be 
counted as page views by our webstatscollector software.
As the patch was rolled out progressively, every month more bogus page views 
were added, up to several billion per month in November.
 
All page review reports now have a very clear warning about this issue.
http://stats.wikimedia.org/EN/TablesPageViewsMonthlyCombined.htm

Thanks to Christian Aistleitner for pinpointing the specific new url's that 
caused overcount, of up to 100 million per day in November:

Special:CentralAutoLogin/createSession
Special:CentralAutoLogin/start
../autonym.ttf

Knowing this we can patch the hourly projectcount files. 
Original files: http://dumps.wikimedia.org/other/pagecounts-raw/2013/2013-11/   
Patched files: http://dumps.wikimedia.org/other/pagecounts-ez/projectcounts/    
 

I'll reply on this thread when the patch has been applied.

Erik Zachte


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