Saga Advanced: Retries, Idempotency, and High Throughput.

1. Compensating Transactions:

A logic that "undoes" a previous step. If step 2 fails, we must run a compensating transaction for step 1 (e.g., if "Payment" fails, we must "Cancel Booking").

2. Retries and Idempotency:

• Retries: If a step fails due to a network glitch, we retry.
• Idempotency: Essential because retries might result in the same message being processed twice. The consumer must ensure that processing the same event twice results in the same state change.

3. Challenges in High Throughput:

• Message Ordering: Ensuring events are processed in the correct sequence.
• State Management: Keeping track of the Saga's current state (usually in a Saga Log or Database).

4. Globally Distributed Sagas:

• Latency: Network hops across regions are slow.
• Solution: Use asynchronous choreography to prevent blocking. Accept that global consistency will be "Eventually Consistent".