Erik Erlandson commented on SPARK-24534:

I think this has potential use for customization beyond the openshift 
downstream. It allows derived images to leverage the apache spark base images 
in contexts outside of directly running the driver and executor processes.

> Add a way to bypass entrypoint.sh script if no spark cmd is passed
> ------------------------------------------------------------------
>                 Key: SPARK-24534
>                 URL: https://issues.apache.org/jira/browse/SPARK-24534
>             Project: Spark
>          Issue Type: Improvement
>          Components: Kubernetes
>    Affects Versions: 2.3.0
>            Reporter: Ricardo Martinelli de Oliveira
>            Priority: Minor
> As an improvement in the entrypoint.sh script, I'd like to propose spark 
> entrypoint do a passthrough if driver/executor/init is not the command 
> passed. Currently it raises an error.
> To me more specific, I'm talking about these lines:
> [https://github.com/apache/spark/blob/master/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh#L113-L114]
> This allows the openshift-spark image to continue to function as a Spark 
> Standalone component, with custom configuration support etc. without 
> compromising the previous method to configure the cluster inside a kubernetes 
> environment.

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