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Distributed Transactions — 2PC, Sagas and exactly-once semantics
How multiple services stay consistent when any of them can fail: two-phase commit, the Saga pattern, idempotency and exactly-once delivery.
The trade-off I'd flag
Two-phase commit is simple to reason about and terrible to operate at scale. Sagas push the complexity into compensating actions — which is where it belongs for long-running business flows.
