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architecture patterns
2 articles across 2 sub-topics
Sub-topic
Cassandra
1 article
The Dual Write Problem in NoSQL: MongoDB, DynamoDB, and Cassandra
TLDR: NoSQL databases trade cross-entity atomicity for scale — and every database draws that atomicity boundary in a different place. MongoDB's boundary is the document (pre-4.0) or the replica set (4.0+ multi-doc transactions). DynamoDB's boundary i...
•34 min read
Sub-topic
Consistency
1 article
The Dual Write Problem: Why Two Writes Always Fail Eventually — and How to Fix It
TLDR: Any service that writes to a database and publishes a message in the same logical operation has a dual write problem. try/catch retries don't fix it — they turn failures into duplicates. The Transactional Outbox pattern co-writes business data ...
•22 min read