[SERVER-82834] Balancer continusly logs if cluster can't be balance due to zones Created: 06/Nov/23  Updated: 09/Nov/23

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

Type: Bug Priority: Major - P3
Reporter: Tommaso Tocci Assignee: Backlog - Catalog and Routing
Resolution: Unresolved Votes: 0
Labels: car-qw
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Catalog and Routing
Operating System: ALL
Participants:
Story Points: 1

 Description   

If zones are configured for a collection, it is totally possible and expected that we end up with an imbalance collection because there is only one shard in a specific zone, so that shard can't donate its chunks to another shard because it would violate zones policy.

If this happens, the balancer will continuously emit this log:

No available shards to take chunks for zone

we should double check which version are affected, for sure in 6.0+ we have this problem.

 


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