Scaling and Upgrading a Hazelcast Deployment

To scale an existing Hazelcast deployment, there are two options:

Modify the yaml definition you used to deploy Hazelcast cluster by updating clusterSize field and re-apply it again:

Assuming the following is the existing configuration:
```
apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast-sample
spec:
  clusterSize: 3
```
and you want to scale your deployment to five replicas, you need to apply the following:
```
apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast-sample
spec:
  clusterSize: 5
```

To scale an existing Hazelcast deployment, use the following command:

kubectl scale hazelcast <name> --replicas <replica-count>

Example:

kubectl scale hazelcast hazelcast-sample --replicas 5

Upgrading

Before upgrading, we recommend that you to read Rolling Upgrades information.

To upgrade your existing deployment to a newer version, you need to update spec.version field and re-apply. For example:

Assuming the following is the existing configuration:

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast-sample
spec:
  clusterSize: 3
  repository: 'docker.io/hazelcast/hazelcast'
  version: '5.2.4-slim'

and you want to upgrade your Hazelcast version to 5.4.0, you need to apply the following:

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast-sample
spec:
  clusterSize: 3
  repository: 'docker.io/hazelcast/hazelcast'
  version: '5.4.0-slim'

Each Operator version has been tested and validated to work correctly with a specific Hazelcast version. You can find the test matrix below. We highly recommend you to consider it to avoid issues during Operator installations.

Operator Version	Hazelcast Version
5.5	5.1.4
5.6	5.2.1
5.7	5.2.3
5.8	5.3.1
5.9	5.3.2
5.10	5.3.5
5.11	5.4.0
5.12	5.4.0
5.13	5.5.0
5.14	5.5.2

Scaling and Upgrading a Hazelcast Deployment

Upgrading

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