[SERVER-63806] Keep using tenant config collections after FCV downgrade Created: 17/Feb/22  Updated: 06/Dec/22  Resolved: 04/Mar/22

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Task Priority: Major - P3
Reporter: A. Jesse Jiryu Davis Assignee: [DO NOT USE] Backlog - Server Serverless (Inactive)
Resolution: Won't Do Votes: 0
Labels: shard-merge-milestone-2
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
depends on SERVER-63995 Drop global config collections Closed
Assigned Teams:
Serverless
Participants:

 Description   

Once we start reading from tenant config collections, and stop writing to global config collections, we must continue using tenant config collections even if FCV is downgraded. Perhaps mongod's rule is "if ShardMergeFCVTimestamp is more than 30 minutes ago, read from tenant config collections, even if FCV < ShardMergeFCV". See design doc for details.



 Comments   
Comment by A. Jesse Jiryu Davis [ 04/Mar/22 ]

Shard Merge Milestone 2 is spun off to a new project PM-2764.

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