Github user liyinan926 commented on the issue:
https://github.com/apache/spark/pull/21748
> Got you points. About labels, right, we could take the road of the code
that creates labels on its own pod. To ensure uniqueness, we could use the
spark-app-id as key (if it maps the requirement of a label name) and driver as
value (let's be imaginative...).
Label `spark-app-id` is only set if `spark-submit` goes through the steps
to create the driver pod so doesn't apply in this case.
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