[DOCS-13170] Investigate changes in SERVER-44027: Remove global X lock for renameCollection between DBs Created: 24/Oct/19  Updated: 13/Nov/23  Resolved: 13/Jan/20

Status: Closed
Project: Documentation
Component/s: manual, Server
Affects Version/s: None
Fix Version/s: 4.3.1, 4.2.2, Server_Docs_20231030, Server_Docs_20231106, Server_Docs_20231105, Server_Docs_20231113

Type: Task Priority: Major - P3
Reporter: Backlog - Core Eng Program Management Team Assignee: Ravind Kumar (Inactive)
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Documented
documents SERVER-44027 Remove global X lock for renameCollec... Closed
Participants:
Days since reply: 4 years, 4 weeks, 2 days ago
Epic Link: DOCS: 4.4 Server Release Work

 Description   

Description

Downstream Change Summary

The 'renameCollection' command no longer uses a Global Write lock for renaming a collection across dbs.
The strongest locks it uses now is a shared lock on the source collection and an exclusive lock on the target DB.

Description of Linked Ticket

Remove global X lock acquisition for renameCollection. This is because acquiring global lock in X mode can be blocked by prepared transactions. The enqueued global X lock can block oplog queries which need the global IS lock. If these oplog queries and the data replication are needed to satisfy the prepared transaction's write concern, then the prepare transaction and replication cannot make progress. Thus a deadlock occurs.

Alternatively, if removing global X lock is not an option, deprecate the usage or make sure it won't be blocked on prepare transactions.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)



 Comments   
Comment by Githook User [ 13/Jan/20 ]

Author:

{'name': 'Ravind Kumar', 'email': 'ravind.kumar@mongodb.com'}

Message: DOCS-13191, DOCS-13166, DOCS-13170: (v4.0 backport)

Comment by Githook User [ 13/Jan/20 ]

Author:

{'name': 'Ravind Kumar', 'email': 'ravind.kumar@mongodb.com'}

Message: DOCS-13191, DOCS-13166, DOCS-13170: remove global locks from reIndex, replSetResizeOplog, renameCollection

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