Last modified: 2014-03-10 20:14:44 UTC
click Login button from http://en.wikipedia.beta.wmflabs.org Login as usual Get red-box error "Login error There was an unexpected error logging in. Please try again. If the problem persists, it may be because you have cookies disabled, and you should check that they are enabled in your browser settings. " No records appear in the fatals log when this happens. After a brief inspection, I see this in both automated tests and manual operation, and it happens more frequently manually.
Also upon clicking BACK and logging in again, user is presented with error msg. Central user log in No active login attempt is in progress for your session. See screen shot
Created attachment 14783 [details] no active login attempt
I think Antoine was fixing this as I was reporting it. It had to do with misconfigured user session caching. Updates to memcache in pmpta and eqiad should solve this.
Earlier today I made a change to be merged which enable memcache writes to both pmtpa and eqiad: https://gerrit.wikimedia.org/r/115623 On beta the sessions are stored in Memcached, unlike production which use a redis backend. The sessions were only stored on one DC which caused much havoc. I believe I fixed it with https://gerrit.wikimedia.org/r/#/c/117867/ which made the sessions to be written to both data centers.
