# NATS

Support for NATS (JetStream only) has been available in RR since `v2.5.0`.

## Configuration

{% code title=".rr.yaml" %}

```yaml
version: "3"

nats:
  addr: "demo.nats.io"

jobs:
  num_pollers: 10
  pipeline_size: 100000
  pool:
    num_workers: 10
    max_jobs: 0
    allocate_timeout: 60s
    destroy_timeout: 60s

  pipelines:
    test-1:
      driver: nats
      config:
        # Pipeline priority
        # If the job has priority set to 0, it will inherit the pipeline's priority. Default: 10.
        priority: 2

        # NATS prefetch
        # Messages to read into the channel
        prefetch: 100

        # NATS subject
        # Default: default
        subject: default

        # NATS stream
        # Default: default-stream
        stream: foo

        # The consumer will only start receiving messages that were created after the consumer was created
        # Default: false (deliver all messages from the stream beginning)
        deliver_new: true

        # Consumer rate-limiter in bytes https://docs.nats.io/jetstream/concepts/consumers#ratelimit
        # Default: 1000
        rate_limit: 100

        # Delete the stream after the pipeline is stopped
        # Default: false
        delete_stream_on_stop: false

        # Delete message from the stream after successful acknowledge
        # Default: false
        delete_after_ack: false
     
        # Time in seconds after which NATS will redeliver the message if no ACK received
        # Default: 30
        ack_wait: 30
```

{% endcode %}

## Configuration options

**Here is a detailed description of each of the nats-specific options:**

### Subject

`subject` - nats [subject](https://docs.nats.io/nats-concepts/subjects).

### Stream

`stream` - stream name.

{% hint style="info" %}
To prevent duplicate message consumption, ensure that each pipeline is configured with a unique NATS stream. Using the same stream for multiple pipelines will result in the same message being processed multiple times.
{% endhint %}

### Deliver new

`deliver_new` - the consumer will only start receiving messages that were created after the consumer was created.

### Rate limit

`rate_limit` - NATS rate [limiter](https://docs.nats.io/jetstream/concepts/consumers#ratelimit).

### Delete stream on stop

`delete_stream_on_stop` - delete the whole stream when pipeline stopped.

### Delete after ack

`delete_after_ack` - delete message after it successfully acknowledged.

### Ack wait

`ack_wait` - time in seconds after which NATS will redeliver the message if no ACK received.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.roadrunner.dev/docs/queues-and-jobs/nats.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.