Github user liyinan926 commented on the issue:
https://github.com/apache/spark/pull/21317
I think `TEST-SECRET.USERNAME` is not what users would want. For the
example `secretKeyRef` below, a user would expect to have
`TEST-SECRET_USERNAME=<...>` and `SECRET_PASSWORD=<...>`.
```
env:
- name: SECRET_USERNAME
valueFrom:
secretKeyRef:
name: mysecret
key: username
- name: SECRET_PASSWORD
valueFrom:
secretKeyRef:
name: mysecret
key: password
```
I think the format of the config property should be
`spark.kubernetes.executor.secretKeyRef.ENV_NAME=name:key`, and `ENV_NAME`
should be case sensitive.
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