NATS

To ensure message order in NATS, set the pending acknowledgment limit to 1. This prevents the server from dispatching multiple messages concurrently, ensuring that messages are processed sequentially by the consumer

You can utilize an ephemeral consumer to perform a SQL-like query over your NATS cluster. To maximize the number of messages retrieved in a single request, adjust the request batch size parameter accordingly. This allows efficient data retrieval without creating persistent consumers.

Info

MaxRequestBatch is the optional maximum batch size a single pull request can make.When set with MaxRequestMaxBytes, the batch size will be constrained by whichever limit is hit first.

The DeliverLast and DeliverLastPerSubject delivery policies can be useful when treating NATS as a lightweight database. These options ensure that consumers receive the most recent message for a subject or per subject group, making it suitable for event-driven state retrieval.

With the Direct Get API and its batch variant, you can retrieve messages directly from NATS JetStream without needing a consumer. This provides an efficient way to query stored messages on demand, reducing consumer overhead in scenarios requiring ad-hoc data access.