# Restart Cluster

Launch stage: GA

`POST /api/2.1/clusters/restart`

Restarts a Spark cluster with the supplied ID. If the cluster is not currently in a `RUNNING` state, nothing will happen.

API scopes: clusters

## Request body

- `cluster_id` (string, optional)
  The cluster to be started.
- `restart_user` (string, optional)

## Request

```json
{
  "cluster_id": "1202-211320-brick1"
}
```

## Response

```json
{}
```