[SERVER-84138] Add balancer modes for unsharded balancing Created: 13/Dec/23  Updated: 05/Feb/24

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

Type: Task Priority: Major - P3
Reporter: Allison Easton Assignee: Backlog - Catalog and Routing
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
related to SERVER-80644 Decouple the balancer mode from wheth... Backlog
Assigned Teams:
Catalog and Routing
Sprint: CAR Team 2023-12-25, CAR Team 2024-01-08, CAR Team 2024-01-22
Participants:

 Description   

Adding in the ability to balance unsharded collections requires introducing new balancer modes. Currently the only mode available is kFull. We should add a few more modes:

  • kSharded only - will allow sharded balancing and draining of unsharded collections when the user specifies a destination shard for removeShard
  • kUnsharded only - will allow all types of unsharded balancing but not sharded balancing
  • kDrainUnshardedOnly - will only allow draining of unsharded collections when the user specifies a destination shard for removeShard

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