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https://issues.apache.org/jira/browse/YARN-7677?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350368#comment-16350368
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Billie Rinaldi commented on YARN-7677:
--------------------------------------

That sounds like a good approach, NM vars followed by preserving the order of 
the user variables. I'd prefer if the NM vars included all the ones defined by 
the NM (see ContainerLaunch.sanitizeEnv), not just the whitelist vars.

> Docker image cannot set HADOOP_CONF_DIR
> ---------------------------------------
>
>                 Key: YARN-7677
>                 URL: https://issues.apache.org/jira/browse/YARN-7677
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Eric Badger
>            Assignee: Jim Brennan
>            Priority: Major
>         Attachments: YARN-7677.001.patch, YARN-7677.002.patch
>
>
> Currently, {{HADOOP_CONF_DIR}} is being put into the task environment whether 
> it's set by the user or not. It completely bypasses the whitelist and so 
> there is no way for a task to not have {{HADOOP_CONF_DIR}} set. This causes 
> problems in the Docker use case where Docker containers will set up their own 
> environment and have their own {{HADOOP_CONF_DIR}} preset in the image 
> itself. 



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