Chen He commented on YARN-3095:

NM can trigger fetching by comparing the image version provided in job.xml with 
images in local repository. Do the update if necessary.

> Enable DockerContainerExecutor to update Docker image
> -----------------------------------------------------
>                 Key: YARN-3095
>                 URL: https://issues.apache.org/jira/browse/YARN-3095
>             Project: Hadoop YARN
>          Issue Type: New Feature
>    Affects Versions: 2.6.0
>            Reporter: Chen He
>            Assignee: Chen He
>              Labels: security
> This JIRA allows DCE to check and update docker image before running a 
> container. 

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