Deploy Lite members

Lite members are Hazelcast cluster members that do not store data or have partitions. They are mainly used to execute tasks and register listeners.

You can use Operator to deploy Lite members. Lite members use the separate liteMember section in the Hazelcast custom resource (CR).

note

Configuring jvm, env, resources or scheduling sections in the Hazelcast CR does not affect Lite member configuration. Lite members are configured separately.

Deploy Lite members

To set the number of Lite members you want to deploy in the Hazelcast CR, use the count field in the liteMember section of the Hazelcast CR.

Example Lite member count configuration

yaml

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast
spec:
  repository: 'docker.io/hazelcast/hazelcast-enterprise'
  licenseKeySecretName: hazelcast-license-key
  clusterSize: 3
  liteMember:
    count: 2

This example deploys three data members and two Lite members. Note that clusterSize represents the number of data members only.

Configure JVM parameters

To configure JVM Parameters for Lite members, use the jvm field in the liteMember section of the Hazelcast CR.

Example Lite member JVM configuration

yaml

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast
spec:
  repository: 'docker.io/hazelcast/hazelcast-enterprise'
  licenseKeySecretName: hazelcast-license-key
  clusterSize: 3
  liteMember:
    count: 2
    jvm:
      memory:
        initialRAMPercentage: "10"
        maxRAMPercentage: "20"
        minRAMPercentage: "10"

Configure resource limits

To configure resource limits for Lite members, use the resources field in the liteMember section of the Hazelcast CR.

Example Lite member resource limits configuration

yaml

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast
spec:
  repository: 'docker.io/hazelcast/hazelcast-enterprise'
  licenseKeySecretName: hazelcast-license-key
  clusterSize: 3
  liteMember:
    count: 2
    resources:
      requests:
        memory: "64Mi"
        cpu: "250m"
      limits:
        memory: "128Mi"
        cpu: "500m"

Configure scheduling

To configure scheduling for Lite members, use the scheduling field in the liteMember section of the Hazelcast CR.

Example Lite member scheduling configuration

yaml

apiVersion: hazelcast.com/v1alpha1
kind: Hazelcast
metadata:
  name: hazelcast
spec:
  repository: 'docker.io/hazelcast/hazelcast-enterprise'
  licenseKeySecretName: hazelcast-license-key
  clusterSize: 3
  liteMember:
    count: 2
    scheduling:
      nodeSelector:
        topology.kubernetes.io/region: us-west1

Configure environment variables

To configure environment variables for Lite members, use the env field in the liteMember section of the Hazelcast CR.

The env field uses the Kubernetes' EnvVar format.

note

You cannot use the env field to configure Hazelcast environment variables, which are prefixed HZ_. To configure the Hazelcast environment variables, use Custom configuration.