[SERVER-80229] Feature Flag Upgrade/Downgrade Testing Created: 17/Aug/23  Updated: 27/Jan/24  Resolved: 27/Jan/24

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

Type: Task Priority: Major - P3
Reporter: PM Bot Assignee: Backlog - Query Execution
Resolution: Won't Do Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Assigned Teams:
Query Execution
Participants:

 Description   

If this project includes a feature flag, please complete all
upgrade/downgrade testing as part of this ticket.
1. Test how the feature behaves when upgrading FCV turns the
feature on
2. Test that the correct behavior occurs when downgrading FCV
completely and then upgrading FCV completely
3. Test that the correct feature behavior occurs if the FCV downgrade
fails after only reaching the `downgrading` FCV state and then FCV is
fully upgraded again
4. Test that anything added by this project to the setFCV command
must be idempotent/retryable.



 Comments   
Comment by Kevin Cherkauer [ 27/Jan/24 ]

This project does not create a new feature flag; it just reuses the existing featureFlagSbeFull flag. The enabling or disabling of this flag does not require upgrade/downgrade testing as it has no impact other than selecting which execution engine (Classic or SBE) affected queries will be run in. There is already extensive testing in patch builds and Evergreen nightly runs of both cases (flag enabled and disabled), so we have confidence in the correctness and performance of both engines for the affected queries.

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