[SERVER-80187] Remove epoch from CollectionGeneration Created: 17/Aug/23  Updated: 26/Oct/23

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

Type: Task Priority: Major - P3
Reporter: Marcos José Grillo Ramirez Assignee: Backlog - Catalog and Routing
Resolution: Unresolved Votes: 0
Labels: oldshardingemea, shardingemea-qw
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Catalog and Routing
Participants:
Story Points: 2

 Description   

Currently the ChunkVersion which is the base of the entire shard versioning protocol relies on the CollectionGeneration which internally contains an epoch and a timestamp.

SERVER-76486 made refineCollectionShardKey authoritative, effectively making all DDL timestamp changes inside of a critical section, which makes the timestamp a reliable source of causality, making it possible to remove the epoch from the CollectionGeneration.


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