Thomas Graves commented on YARN-7935:

thanks for the explanation Mridul. I'm fine with waiting on the spark Jira til 
you know the scope better, I'm currently not doing anything with bridge mode so 
won't be able to help there at this point.

> Expose container's hostname to applications running within the docker 
> container
> -------------------------------------------------------------------------------
>                 Key: YARN-7935
>                 URL: https://issues.apache.org/jira/browse/YARN-7935
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: Suma Shivaprasad
>            Assignee: Suma Shivaprasad
>            Priority: Major
>         Attachments: YARN-7935.1.patch, YARN-7935.2.patch
> Some applications have a need to bind to the container's hostname (like 
> Spark) which is different from the NodeManager's hostname(NM_HOST which is 
> available as an env during container launch) when launched through Docker 
> runtime. The container's hostname can be exposed to applications via an env 
> CONTAINER_HOSTNAME. Another potential candidate is the container's IP but 
> this can be addressed in a separate jira.

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