Help - Integrating NATS JetStream with FastStream: Compatibility and Best Practices

[Atanusaha143]

Please consider the following scenarios, and provide solutions from a FastStream perspective using NATS JetStream:

Message Durability and Reliability

1. How will we ensure messages are not lost due to server crashes or network issues?
2. What persistence mechanisms are needed to guarantee message durability?
3. Should we use acknowledgments to confirm message receipt, and how will they be managed?

Message Ordering

1. Order messages for important use cases (financial transactions), how will we guarantee it?
2. How will we handle situations where strict ordering conflicts with parallel processing requirements?

At-Least-Once vs. At-Most-Once Delivery

1. How will we ensure each message is delivered at least once, even if it causes duplicates?
2. How will we ensure idempotency to handle duplicate messages in the case of at-least-once delivery?
3. If we choose at-most-once delivery, what are the potential risks of message loss, and how will we mitigate them?

Handling Duplicates

1. How will we detect and manage duplicate messages to prevent unwanted side effects?
2. What unique identifiers or hashing methods will we use to identify and handle duplicate messages?

Retry Mechanisms and Dead Letter Queues

1. What retry logic (e.g., exponential backoff) will we use to handle temporary processing errors?
2. How will we manage messages that repeatedly fail, and should they be sent to a dead letter queue?
3. How will we handle messages in the dead letter queue for further inspection or reprocessing?

Message Expiration and Time-to-Live (TTL)

1. Should certain messages expire if they’re not processed within a certain time, and if so, how will we enforce TTL?
2. How will we manage expired messages, and should they be automatically removed from the queue?

Prioritization of Messages

1. How will we process some messages with higher priority than others, and how will we prioritize them?
2. Should priority-based queues be implemented, and if so, how will they impact processing?

Error Handling and Exception Management

1. How will we differentiate between recoverable and non-recoverable errors in message processing?
2. What logging and alerting mechanisms will be used to track errors and processing failures?

Poison Messages

1. How will we identify and manage poison messages that consistently fail to process?
2. How should we set a retry limit for messages?
3. How will we route poison messages to a dead letter queue or handle them manually?

Batch Size and Bulk Processing

1. What is the recommended batch size for processing messages in our specific use case?
2. How can batch size affect error handling and retries in message processing?