Github user mccheah commented on a diff in the pull request:
https://github.com/apache/spark/pull/21748#discussion_r205177861
--- Diff: docs/running-on-kubernetes.md ---
@@ -117,6 +117,45 @@ If the local proxy is running at localhost:8001,
`--master k8s://http://127.0.0.
spark-submit. Finally, notice that in the above example we specify a jar
with a specific URI with a scheme of `local://`.
This URI is the location of the example jar that is already in the Docker
image.
+## Client Mode
+
+Starting with Spark 2.4.0, it is possible to run Spark applications on
Kubernetes in client mode. When your application
+runs in client mode, the driver can run inside a pod or on a physical
host. When running an application in client mode,
+it is recommended to account for the following factors:
+
+### Client Mode Networking
+
+Spark executors must be able to connect to the Spark driver over a
hostname and a port that is routable from the Spark
+executors. The specific network configuration that will be required for
Spark to work in client mode will vary per
+setup. If you run your driver inside a Kubernetes pod, you can use a
+[headless
service](https://kubernetes.io/docs/concepts/services-networking/service/#headless-services)
to allow your
+driver pod to be routable from the executors by a stable hostname. When
deploying your headless service, ensure that
+the service's label selector will only match the driver pod and no other
pods; it is recommended to assign your driver
+pod a sufficiently unique label and to use that label in the label
selector of the headless service. Specify the driver's
+hostname via `spark.driver.host` and your spark driver's port to
`spark.driver.port`.
--- End diff --
Yeah manual setup is fine for now. Think additional docs around how to do
all this can be a separate PR.
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