| HMS Helm Chart

In simple terms, Helm is a package manager for Kubernetes. This Hive chart (package) encapsulates all configurations and components needed to deploy a Hive Metastore service in a Kubernetes cluster.

Kubernetes Resources used in this Hive Chart

The resources used in the this chart are defined in yaml files inside /templates directory. The following resources are used:

• Configmap: this kube resource creates volumes that can be attached to containers. Here, we're mounting a volume to the HMS configuration templates directory, which will be used by the HMS docker image to render the metastore-site.yaml config file.
• Service: this resources is responsible to expose the HMS service to the external.
• Horizontal Pods Autoscaler (HPA): this resource increases the number of pods available in a ReplicaSet based on some thresholds (memory and cpu) in order to guarantee the service availability
• Deployment: this the main resource here, because it specifies pod's configurations and is the link between all resources and the HMS pods.