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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5714) ContainerExecutor does not order environment map
Date Wed, 04 Jan 2017 00:11:58 GMT

    [ https://issues.apache.org/jira/browse/YARN-5714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796644#comment-15796644
] 

Daniel Templeton commented on YARN-5714:
----------------------------------------

Coming back to [~Naganarasimha]'s original comment, wouldn't it be simpler and more effective
to use a linked hash map to preserve the order given by the client?  Sorry.  I know that's
the last comment you want to hear after six rounds on the patch. :)

> 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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