thousandhu opened a new pull request, #40361:
URL: https://github.com/apache/spark/pull/40361
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### What changes were proposed in this pull request?
When start spark on k8s，driver pod use spark.kubernetes.driver.master to
get apiserver address. This config us https://kubernetes.default.svc/ as
default and do not care about the apiserver port.
In our case, apiserver port is not 443 will driver will throw
connectException. As k8s doc mentioned
（https://kubernetes.io/docs/tasks/run-application/access-api-from-pod/#directly-accessing-the-rest-api）,
we can get master url by getting KUBERNETES_SERVICE_HOST and
KUBERNETES_SERVICE_PORT_HTTPS environment variables from pod. So we add a new
conf spark.kubernetes.driver.master.from.pod.env to allow driver get master url
from env in cluster mode on k8s
### Why are the changes needed?
Add a new conf spark.kubernetes.driver.master.from.pod.env to let the
driver pod get apiserver automatically from pod env instead of by
spark.kubernetes.driver.master.
### Does this PR introduce _any_ user-facing change?
Yes. When user set new conf spark.kubernetes.driver.master.from.pod.env as
true, the logic of driver get apiserver url will changed. In some case it will
help user to get right apiserver url.
By default, the conf spark.kubernetes.driver.master.from.pod.env is false,
and the driver logic changes nothing.
### How was this patch tested?
No. the apiserver is mocked in unit test. we tested this feature in our k8s
cluster
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