https://bugzilla.wikimedia.org/show_bug.cgi?id=66101

Chris Steipp <[email protected]> changed:

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--- Comment #4 from Chris Steipp <[email protected]> ---
If you're pulling those user_ids from the local wikis, then it's totally
expected for them to have different user_ids across wikis. The text of the
username is how we relate accounts.

Each wiki will assign a new user_id (user.user_id in the local wiki db) to a
username when the user is created or autocreated there-- sequential for that
wiki. When a user is created the first time, they should get a CentralAuth
global id (globaluser.gu_id in the centralauth database). There shouldn't be a
way for the same username to have multiple gu_id's in the centralauth db. If
that's happening, we have a very, very bad problem. But gu_name is declared as
a unique key in the database, so someone would have had to manually update our
centralauth db for that to happen.

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