Sam ffc3da35a6
FIX: handle rapid concurrent SSO attempts more gracefully (#11180)
Rapid concurrent SSO attempts is something that happens quite frequently
in the wild at large enough scale.

When this happens conditions such as adding a user to a group could possibly
fire concurrently causing a user to be added to the same group twice and
erroring out.

To avoid all concurrency issues here we protect with a coarse distributed
mutex. This heavily mitigates the risk around concurrent group additions and
concurrent updates to user related records.
2020-11-10 10:40:41 +00:00
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