Q1. Compare at-most-once, at-least-once and exactly-once delivery.
- At-most-once: the broker may deliver a message once or not at all. It never duplicates, so it can lose data. Achieved by acknowledging before processing. Suitable for m...
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Q2. How do message queues help and what guarantees do they provide?
Queues decouple producers from consumers, absorb traffic spikes, enable retries and fan-out, and improve resilience when a downstream service is slow or down. Delivery se...
Q3. When do you choose synchronous versus asynchronous communication?
Synchronous calls (HTTP/REST, gRPC) are simple, easy to reason about and return results immediately, which suits queries and request-response workflows. The downside is t...
Q4. What is the difference between SQS and SNS?
SQS is a queue; SNS is a publish and subscribe topic. They solve different problems and are often combined. - SQS is point-to-point. A message is stored until a consumer ...
Q5. What ordering guarantees do message systems provide?
Ordering is usually per partition or per queue, not global. - Kafka orders records within a partition only. Records with the same key go to the same partition, preserving...