<quote name="Greg Grossmeier" date="2016-07-12" time="09:24:38 -0700">
https://phabricator.wikimedia.org/T119736 - "Could not find local user data for {Username}@{wiki}"
There was an order of magnitude increase in the rate of those errors that started on July 7th.
Investigation and remediation is on-going.
Investigation and remediation is mostly complete[0] and the vast majority of cases have been addressed. There are still users who will experience this error for the next ~1 day.[1]
1.28.0-wmf.10 will be branched tomorrow and we will run an abbreviated train schedule (group0 and group1 on Wednesday, group2 on Thursday).
Thanks to Matt Flaschen and Brad Jorsch (and others like Ori Livneh and Bryan Davis) for their help.
Sorry for the inconvenience.
Greg
[0] Modulo https://phabricator.wikimedia.org/T140156 which shouldn't effect auto-creation.
[1] Users who were affected by this already before the fixes in the code were deployed will still have the issue until the script that fixes those cases completes running, which takes roughly 1 day. There is a run of it going now, but we will run it again as we deployed fixes mid-run.