users with most revisions with 0 userid per wiki (+ overall counts per wiki)
The issue surfaced when edits per wiki per month per namespace were merged into one file for all 800 wikis.
Lines in merged editor file: 55351997
Lines with user id 0: 603446 (1.1% of total).
Often one user has revisions with userid 0 and revisions with the proper userid in same stub dump. In some wikis hundreds of user have revisions with userid 0.
E.g.check historic stub dump for mediawikiwiki :
http://dumps.wikimedia.org/mediawikiwiki/20140605/mediawikiwiki-20140605-stub-meta-history.xml.gz
First field after user name is userid, for Erik Zachte sometimes 20226, sometimes 0. I checked the actual dump content: it is in the dumps.
Erik Zachte 0 2004-01 wx mediawiki 100 3
Erik Zachte 0 2004-03 wx mediawiki 0 5
Erik Zachte 20226 2004-03 wx mediawiki 102 10
Erik Zachte 20226 2004-04 wx mediawiki 0 2
Erik Zachte 20226 2004-04 wx mediawiki 102 1
Erik Zachte 0 2004-05 wx mediawiki 0 3
Erik Zachte 20226 2004-05 wx mediawiki 102 1
Erik Zachte 20226 2004-06 wx mediawiki 102 25
Erik Zachte 20226 2004-06 wx mediawiki 103 7
Erik Zachte 0 2004-07 wx mediawiki 0 1
Erik Zachte 20226 2004-07 wx mediawiki 102 10
See also https://trello.com/c/3ecjp9aM/237-master-monthly-editor-activity-data
Version: unspecified
Severity: normal
Attached: