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https://issues.apache.org/jira/browse/YARN-7226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16179676#comment-16179676
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Eric Badger commented on YARN-7226:
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[~jlowe], this approach makes sense to me. I don't see any case where the
docker container would want to use the NM's env vars over its own specified env
vars, since the layout of the docker container is completely separate from that
of the NM. So basically in the docker case, the docker container will either
get what the user explicitly sets or whatever is in the docker image (in that
order).
And if we want to have variables that won't be overridden by anything (i.e. we
take whatever the docker container sets no matter what), then we should do that
in a different place than the whitelist and should file a followup JIRA.
> Whitelisted variables do not support delayed variable expansion
> ---------------------------------------------------------------
>
> Key: YARN-7226
> URL: https://issues.apache.org/jira/browse/YARN-7226
> Project: Hadoop YARN
> Issue Type: Bug
> Components: nodemanager
> Affects Versions: 2.9.0, 2.8.1, 3.0.0-alpha4
> Reporter: Jason Lowe
> Assignee: Jason Lowe
> Attachments: YARN-7226.001.patch, YARN-7226.002.patch
>
>
> The nodemanager supports a configurable list of environment variables, via
> yarn.nodemanager.env-whitelist, that will be propagated to the container's
> environment unless those variables were specified in the container launch
> context. Unfortunately the handling of these whitelisted variables prevents
> using delayed variable expansion. For example, if a user shipped their own
> version of hadoop with their job via the distributed cache and specified:
> {noformat}
> HADOOP_COMMON_HOME={{PWD}}/my-private-hadoop/
> {noformat}
> as part of their job, the variable will be set as the *literal* string:
> {noformat}
> $PWD/my-private-hadoop/
> {noformat}
> rather than having $PWD expand to the container's current directory as it
> does for any other, non-whitelisted variable being set to the same value.
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