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Type:
Task
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Resolution: Won't Do
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Priority:
Major - P3
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Affects Version/s: None
Description
Downstream Change Summary
Setting FCV to 4.4 to 4.2 will now fail if long collection names (> 120chars) are present
Description of Linked Ticket
DatabaseImpl::_checkCanCreateCollection() throws an exception if a collection with a name longer than 120 characters is attempted to be created while in FCV 4.2. However, a node undergoing initial sync will also call that function and (depending on whether the admin.system.version collection has already been cloned) would fail its initial sync attempt and eventually exhaust its retries.
[js_test:repro_initial_sync_long_collection_name] 2020-10-02T18:19:19.708+0000 d20021| {"t":{"$date":"2020-10-02T18:19:19.708+00:00"},"s":"E", "c":"REPL", "id":21416, "ctx":"ReplCoordExtern-0","msg":"Initial sync failed, shutting down now. Restart the server to attempt a new initial sync"}
[js_test:repro_initial_sync_long_collection_name] 2020-10-02T18:19:19.708+0000 d20021| {"t":{"$date":"2020-10-02T18:19:19.708+00:00"},"s":"F", "c":"-", "id":23095, "ctx":"ReplCoordExtern-0","msg":"Fatal assertion","attr":{"msgid":40088,"error":"InitialSyncFailure: error cloning databases :: caused by :: IncompatibleServerVersion: Error cloning collection 'test.long_collection_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' :: caused by :: Fully qualified namespace is too long for FCV 4.2. Upgrade to FCV 4.4 to create this namespace. Namespace: test.long_collection_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx FCV 4.2 Limit: 120","file":"src/mongo/db/repl/replication_coordinator_impl.cpp","line":754}}
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)
- documents
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SERVER-51333 setFeatureCompatibilityVersion should fail when downgrading from FCV 4.4 to FCV 4.2 with long collection names present
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- Closed
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