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Type: Improvement
Resolution: Fixed
Priority: Major - P3
Fix Version/s: 8.2.0-rc0
Affects Version/s: None
Component/s: None
Labels:
None

Assigned Teams:

Catalog and Routing
Backwards Compatibility:
Fully Compatible
Sprint:
CAR Team 2025-02-17, CAR Team 2025-03-03, CAR Team 2025-03-17
Story Points:
2
Confidence Status:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Name:
None
Goal Link:
None

Historically we needed to hold a collection/DB lock in order to access some sharding state, but since the introduction of the CSS/DSS these are effectively the locks we use to coordinate accessing that state. We don't need to hold a higher level lock anymore, so it doesn't make sense to enforce that through the API.

Some examples where we take those locks unnecessarily:
https://github.com/10gen/mongo/blob/dface7ce0b386b3917010b98aa35a09dbe414589/src/mongo/db/s/migration_source_manager.cpp#L411-L416
https://github.com/10gen/mongo/blob/dface7ce0b386b3917010b98aa35a09dbe414589/src/mongo/db/s/migration_source_manager.cpp#L634
https://github.com/10gen/mongo/blob/dface7ce0b386b3917010b98aa35a09dbe414589/src/mongo/db/s/migration_source_manager.cpp#L236

fixes

SERVER-58222 Investigate op_observer_sharding_impl.cpp lock acquisition

Closed

SERVER-99704 Investigate if we can remove a lock ordering conflict in RangeDeleterServiceOpObserver

Closed

is related to

SERVER-101759 Investigate removing AutoGetCollections when calling filteringMetadata methods on the CSR

Backlog

SERVER-101760 Investigate removing AutoGetCollections when calling index methods on the CSR

Backlog

SERVER-101761 Investigate removing DB/Coll locks in shard_filtering_metadata_refresh.cpp

Backlog

SERVER-101762 Investigate removing AutoGetDBs when calling set/clearDBInfo() on the DSS

Backlog

SERVER-102535 Investigate removing AutoGetDBs when calling is/set/unsetMovePrimaryInProgress on the DSS

Backlog

SERVER-101785 Lock the database in Intent Exclusive mode (IX) instead of Exclusive mode (X) when setting or clearing database metadata in the authoritative model

Closed

(3 is related to)

Assignee:: Daniel Gomez Ferro

Reporter:: Daniel Gomez Ferro

Participants:: Daniel Gomez Ferro

Votes:: 0 Vote for this issue

Watchers:: 3 Start watching this issue

Created:: Jan 28 2025 09:21:48 AM UTC

Updated:: Mar 19 2025 11:42:35 AM UTC

Resolved:: Mar 19 2025 11:42:34 AM UTC

Confidence Status Last Update:: 17/Feb/25 3:38 PM

GA Target Date:: None

Public Preview Target Date:: None

Private Preview Target Date:: None

Experiment Target Date:: None

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