[SERVER-38678] Drop X locks from manipulations to admin database Created: 17/Dec/18  Updated: 29/Oct/23  Resolved: 30/Dec/20

Status: Closed
Project: Core Server
Component/s: Replication, Security, Storage
Affects Version/s: None
Fix Version/s: 4.8.1

Type: Task Priority: Major - P3
Reporter: Spencer Jackson Assignee: Backlog - Security Team
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Server Security
Backwards Compatibility: Fully Compatible
Participants:

 Description   

Writes to collections in the admin database imply taking an X lock on the entire database, rather than just the collection. This enforces serialization of writes between admin.system.users and admin.system.roles, and prevents the RoleGraph from being informed of multiple updates in parallel. The elevated strength of the locks prevents transactions from working on the admin database.


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