Configure MultiMaps

Hazelcast MultiMap, also known as IMultiMap, is a specialized map for storing multiple values under a single key. Just like any other distributed data structure implementation in Hazelcast, MultiMap is distributed and thread-safe. You can create and configure MultiMaps using the MultiMap custom resource.

Configure a MultiMap resource

You can use any of the following configuration options in the MultiMap resource. For more information, see the API reference.

Field	Description
name	Name of the MultiMap that you're creating. If empty, the custom resource (CR) name is used.
hazelcastResourceName	Name of the Hazelcast resource.
backupCount	Number of synchronous backups.
asyncBackupCount	Number of asynchronous backups.
binary	When true, stores all MultiMap values in BINARY format. When false, values are stored in OBJECT format.
collectionType	The type of the value collection. Use either SET or LIST.

Example configuration

The following MultiMap custom resource creates a MultiMap for the Hazelcast resource that is defined in the hazelcastResourceName field.

Example configuration

yaml

apiVersion: hazelcast.com/v1alpha1
kind: MultiMap
metadata:
  name: multimap-sample
spec:
  hazelcastResourceName: hazelcast
  binary: false
  backupCount: 1
  collectionType: SET

After creating the MultiMap resource, you can check its status:

shell

kubectl get multimap multimap-sample -o wide

NAME              STATUS    HAZELCAST-RESOURCE   MESSAGE
multimap-sample   Success   hazelcast