[MSSQL] Ensure consistent ordering of CDC operations - #742
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- Ensure correct ordering of CDC results - Handle deferred updates - Correctly count processed transactions in each polling cycle - Improved logging - Added tests
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Cleaned up cdc operation grouping function
stevensJourney
previously approved these changes
Aug 11, 2026
# Conflicts: # modules/module-mssql/src/replication/CDCPoller.ts
…tureReconciler tests
Rentacookie
commented
Aug 12, 2026
Rentacookie
commented
Aug 12, 2026
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Summary
This fixes an issue that was discovered where deferred updates could result in missing row updates.
Deferred updates are recorded in the CDC tables as a paired
DELETEandINSERToperation, with the 2 operations having the same sequence number in the same transaction. This caused problems with the ordering of operations in the same transaction and theINSERTcould be processed before theDELETEcausing the replicated row to disappear.Changes
operationas a tie breaker when ordering CDC results within a transaction.Testing
Added new CDCPoller.test.ts unit tests which helped diagnose the main issue and confirms the fixes.
Moved MSSQLSourceTable test cases to own test file.
AI Disclosure
Used Clause Opus 5 to replicate the issue with tests and implement then implement the fix. Also reviewed and verified changeds with GPT 5.6.