The module lifecycle stage: Preview
The module has requirements for installation

HiveMetastoreClass

Cluster Wide HiveMetastoreClass resource allows limiting the creation of invalid configurations and predefining some values. Every HiveMetastore resource must be linked to an existing HiveMetastoreClass resource. Before deploying the service, all configuration will be checked against the corresponding HiveMetastoreClass.

Sizing Policies

Structure that allows creating a set of policies for determining the size of linked HiveMetastore. This will help avoid uneven distribution of CPU and Memory resources on cluster nodes. The determining factor for choosing a particular policy is falling within the cores interval. Then compliance with other fields of the specific policy will be checked.

spec:
  sizingPolicies:
    - cores:
        min: 1
        max: 4
      memory:
        min: 100Mi
        max: 1Gi
        step: 1Mi
      coreFraction: [10%, 30%, 50%]
    - cores:
        min: 5
        max: 10
      memory:
        min: 500Mi
        max: 2Gi
      coreFraction: [50%, 70%, 100%]

Validation Rules

CEL (Common Expression Language) is used as syntax for creating flexible validation mechanisms. We provide a set of predefined variables that can be used in rule:

  • instance.memory.size
  • instance.cpu.cores
spec:
  validations:
    - message: "CPU cores must be between 1 and 8"
      rule: "instance.cpu.cores >= 1 && instance.cpu.cores <= 64"

Affinity

Standard Kubernetes mechanism for managing scheduling of deployed pods.

spec:
  nodeAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      nodeSelectorTerms:
      - matchExpressions:
        - key: "node.deckhouse.io/group"
          operator: "In"
          values:
          - "hms"

Tolerations

Standard Kubernetes mechanism for managing scheduling of deployed pods.

spec:
  tolerations:
  - key: primary-role
    operator: Equal
    value: hms
    effect: NoSchedule

Node Selector

Standard Kubernetes mechanism for managing scheduling of deployed pods.

spec:
  nodeSelector:
    "node.deckhouse.io/group": "hms"

Usage Examples

Basic Usage

apiVersion: managed-services.deckhouse.io/v1alpha1
kind: HiveMetastoreClass
metadata:
  name: default
spec:
  sizingPolicies:
    - cores:
        min: 1
        max: 2
      memory:
        min: 2Gi
        max: 4Gi
        step: 512Mi
      coreFractions:
        - "25%"
        - "50%"
        - "75%"
        - "100%"
  validations:
    - message: "CPU cores must be between 1 and 8"
      rule: "instance.cpu.cores >= 1 && instance.cpu.cores <= 16"