# SpicepodCluster

A `SpicepodCluster` deploys a distributed query cluster with dedicated scheduler and executor nodes. The operator automatically manages mTLS certificate provisioning, child `SpicepodSet` resources, and cluster topology.

## Architecture

```
             ┌─────────────────────┐
             │    Load Balancer    │
             └─────────────────────┘
                        │
     ┌──────────────────┼──────────────────┐
     ▼                  ▼                  ▼
┌──────────┐     ┌──────────┐     ┌──────────┐
│Scheduler │     │Scheduler │     │Scheduler │◄──► Object Store (S3)
└──────────┘     └──────────┘     └──────────┘
     ▲                  ▲                  ▲
     │    (executor-initiated connections) │
     │                  │                  │
┌──────────┐     ┌──────────┐     ┌──────────┐
│ Executor │     │ Executor │     │ Executor │────► Object Store (shuffle)
└──────────┘     └──────────┘     └──────────┘
```

Schedulers coordinate query planning and execution; executors perform the compute work. Executors initiate connections to all schedulers and are shared across them.

## Example

```yaml
apiVersion: spice.ai/v1alpha1
kind: SpicepodCluster
metadata:
  name: my-cluster
  namespace: default
spec:
  schedulerSetSpec:
    replicas: 1
    spicepod: |
      version: v1
      kind: Spicepod
      name: my-cluster-scheduler
    resources:
      requests:
        cpu: 100m
        memory: 256Mi
      limits:
        cpu: 500m
        memory: 512Mi
  executorSetSpec:
    replicas: 3
    resources:
      requests:
        cpu: 200m
        memory: 512Mi
      limits:
        cpu: "1"
        memory: 2Gi
```

## Multi-Replica Schedulers

For high availability, deploy multiple schedulers:

```yaml
spec:
  schedulerSetSpec:
    replicas: 2
```

Each scheduler independently accepts and distributes work. Shared state is maintained in an S3-compatible object store.

## Automatic mTLS

The operator automatically:

1. Generates a self-signed root CA certificate.
2. Issues per-node leaf certificates with appropriate SANs.
3. Configures mTLS between all cluster nodes.
4. Stores certificates in Kubernetes Secrets.
5. Tracks certificate expiry via Prometheus metrics.

### Development Mode

For development and testing, mTLS can be disabled:

```yaml
spec:
  allowInsecureConnections: true
```

{% hint style="danger" %}
Never use `allowInsecureConnections: true` in production. All inter-node communication will be unencrypted.
{% endhint %}

## Port Separation

| Port  | Visibility   | Services                        | mTLS Required |
| ----- | ------------ | ------------------------------- | ------------- |
| 50051 | Public       | Arrow Flight, OpenTelemetry     | Optional      |
| 8090  | Public       | HTTP API                        | Optional      |
| 9090  | Public       | Prometheus metrics              | No            |
| 50052 | **Internal** | Scheduler gRPC, Cluster Service | **Required**  |

The internal port (50052) carries cluster coordination traffic:

* **`GetAppDefinition`** — Executors fetch the full Spicepod configuration from the scheduler.
* **`ExpandSecret`** — Executors request secret values from the scheduler's secret store.

## Verification

```bash
# Check cluster status
kubectl get spicepodcluster my-cluster

# List child SpicepodSets
kubectl get spicepodset

# Check pods by role
kubectl get pods -l spice.ai/cluster=my-cluster
kubectl get pods -l spice.ai/cluster-role=scheduler
kubectl get pods -l spice.ai/cluster-role=executor
```

## Configuration Inheritance

`SpicepodCluster` creates child `SpicepodSet` resources for schedulers and executors. All `SpicepodSet` configuration options (resources, volumes, service accounts, update strategies, health probes, pod scheduling) are available in `schedulerSetSpec` and `executorSetSpec`.


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