[FLINK-27856] Adding pod template without spec crashes job manager

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.16.0, 1.15.2
• Component/s: Deployment / Kubernetes
• Labels: pull-request-available
• Assignee: Peng Yuan
• Reporter: Jeesmon Jacob
• Created: 31/May/22 18:39
• Updated: 12/Aug/22 08:32
• Resolved: 12/Aug/22 08:32

Description

While trying to add Pod annotation through pod template in FlinkDeployment, taskmanager was keep crashing.

Pod template that I used:

  taskManager:
    podTemplate:
      apiVersion: v1
      kind: Pod
      metadata:
        annotations:
          iam.amazonaws.com/role: fake-role-arn

It created below ConfigMap and mounted to the deployment:

apiVersion: v1
data:
  taskmanager-pod-template.yaml: |
    ---
    apiVersion: "v1"
    kind: "Pod"
    metadata:
      annotations:
        iam.amazonaws.com/role: "fake-role-arn"
kind: ConfigMap

Looks like missing "spec" stanza in pod template resulted in the crash and I couldn't find any documentation that "spec" is required for pod template even for just adding metadata annotations.

Adding below worked fine

  taskManager:
    podTemplate:
      apiVersion: v1
      kind: Pod
      metadata:
        annotations:
          iam.amazonaws.com/role: fake-role-arn
      spec: {}

Corresponding ConfigMap

apiVersion: v1
data:
  taskmanager-pod-template.yaml: |
    ---
    apiVersion: "v1"
    kind: "Pod"
    metadata:
      annotations:
        iam.amazonaws.com/role: "fake-role-arn"
    spec:
      containers: []

Issue Links

• links to: GitHub Pull Request #20516