distributed-transactions

To ensure atomic commits across distributed systems, you implement distributed transaction protocols like two-phase commit (2PC) or three-phase commit (3PC) that coordinate participating nodes to either fully apply or rollback operations during failures.

2PC coordinates atomic commits through a central coordinator, Percolator provides snapshot isolation for large batch updates, and Spanner uses TrueTime clocks for globally consistent transactions across distributed regions.

Use Sagas instead of 2PC when you need to avoid locking resources for long periods, as Sagas break distributed transactions into a sequence of local transactions with compensating actions to handle failures.

Spanner TrueTime handles distributed transaction consistency by using synchronized physical clocks with bounded uncertainty to assign globally meaningful commit timestamps, ensuring external consistency across regions.

Yes, implementing distributed transactions requires an understanding of distributed systems, transaction management, and consensus protocols to properly handle atomicity and coordinate failures across nodes.

Two-phase commit limitations include blocking if the coordinator fails, performance bottlenecks from synchronous waiting, and inability to scale efficiently across multiple regions or during network partitions.