Jason Lowe commented on YARN-5714:

On second thought, it's extremely unlikely that NM whitelist variables could 
reference user variables.  Details are in [this 
 on YARN-7667.  I think we'll be fine if we make sure the NM whitelist 
inherited variables appear first in the launch script then followed by the 
user's variables in the order they are specified in the container launch 
context.  YARN-7667 should be taking care of the NM whitelist variables, so 
this JIRA can tackle ordering the user's variables.

> ContainerExecutor does not order environment map
> ------------------------------------------------
>                 Key: YARN-5714
>                 URL: https://issues.apache.org/jira/browse/YARN-5714
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.4.1, 2.5.2, 2.7.3, 2.6.4, 3.0.0-alpha1
>         Environment: all (linux and windows alike)
>            Reporter: Remi Catherinot
>            Assignee: Remi Catherinot
>            Priority: Trivial
>              Labels: oct16-medium
>         Attachments: YARN-5714.001.patch, YARN-5714.002.patch, 
> YARN-5714.003.patch, YARN-5714.004.patch, YARN-5714.005.patch, 
> YARN-5714.006.patch
>   Original Estimate: 120h
>  Remaining Estimate: 120h
> when dumping the launch container script, environment variables are dumped 
> based on the order internally used by the map implementation (hash based). It 
> does not take into consideration that some env varibales may refer each 
> other, and so that some env variables must be declared before those 
> referencing them.
> In my case, i ended up having LD_LIBRARY_PATH which was depending on 
> HADOOP_COMMON_HOME being dumped before HADOOP_COMMON_HOME. Thus it had a 
> wrong value and so native libraries weren't loaded. jobs were running but not 
> at their best efficiency. This is just a use case falling into that bug, but 
> i'm sure others may happen as well.
> I already have a patch running in my production environment, i just estimate 
> to 5 days for packaging the patch in the right fashion for JIRA + try my best 
> to add tests.
> Note : the patch is not OS aware with a default empty implementation. I will 
> only implement the unix version on a 1st release. I'm not used to windows env 
> variables syntax so it will take me more time/research for it.

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