Suma Shivaprasad created YARN-7935:
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             Summary: 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


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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