Sidharta Seethana commented on YARN-2981:

[~ashahab]  The change seems fine to me. I would recommend adding a unit test 
(like Ravi mentions above) and changing the docker image specified in the 
example to a more recent one ( I think there is a 2.6.0 image available ).


> DockerContainerExecutor must support a Cluster-wide default Docker image
> ------------------------------------------------------------------------
>                 Key: YARN-2981
>                 URL: https://issues.apache.org/jira/browse/YARN-2981
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Abin Shahab
>            Assignee: Abin Shahab
>         Attachments: YARN-2981.patch, YARN-2981.patch, YARN-2981.patch, 
> YARN-2981.patch
> This allows the yarn administrator to add a cluster-wide default docker image 
> that will be used when there are no per-job override of docker images. With 
> this features, it would be convenient for newer applications like slider to 
> launch inside a cluster-default docker container.

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