[SERVER-62849] Drain recoverable RefineCollectionShardKeyCoordinators on FCV downgrade Created: 21/Jan/22  Updated: 29/Oct/23  Resolved: 01/Feb/22

Status: Closed
Project: Core Server
Component/s: Sharding
Affects Version/s: None
Fix Version/s: 5.3.0

Type: Task Priority: Major - P3
Reporter: Jordi Serra Torrens Assignee: Jordi Serra Torrens
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
Problem/Incident
Related
related to SERVER-62332 RefineCollectionShardKeyCoordinator d... Closed
Backwards Compatibility: Fully Compatible
Sprint: Sharding EMEA 2022-02-07
Participants:
Linked BF Score: 164

 Description   

SERVER-62332 introduced a recoverable ShardingDDLCoordinator for RefineCollectionShardKey. This new coordinator will persist a state document. It is necessary to drain the new coordinators during FCV downgrade in order to ensure that an old binary won't find state documents about a DDL coordinator it doesn't support.

Once this is done, we can also enable the feature flag that guards the new RefineCollectionShardKeyCoordinator.



 Comments   
Comment by Githook User [ 01/Feb/22 ]

Author:

{'name': 'Jordi Serra Torrens', 'email': 'jordi.serra-torrens@mongodb.com', 'username': 'jordist'}

Message: SERVER-62849 Drain recoverable RefineCollectionShardKeyCoordinators on FCV downgrade
Branch: master
https://github.com/mongodb/mongo/commit/0374b5211c22c67471bea8dffb0a28b68d1eec1a

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