[SERVER-63806] Keep using tenant config collections after FCV downgrade Created: 17/Feb/22 Updated: 06/Dec/22 Resolved: 04/Mar/22 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Task | Priority: | Major - P3 |
| Reporter: | A. Jesse Jiryu Davis | Assignee: | [DO NOT USE] Backlog - Server Serverless (Inactive) |
| Resolution: | Won't Do | Votes: | 0 |
| Labels: | shard-merge-milestone-2 | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Issue Links: |
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| Assigned Teams: |
Serverless
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| Description |
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Once we start reading from tenant config collections, and stop writing to global config collections, we must continue using tenant config collections even if FCV is downgraded. Perhaps mongod's rule is "if ShardMergeFCVTimestamp is more than 30 minutes ago, read from tenant config collections, even if FCV < ShardMergeFCV". See design doc for details. |
| Comments |
| Comment by A. Jesse Jiryu Davis [ 04/Mar/22 ] |
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Shard Merge Milestone 2 is spun off to a new project PM-2764. |