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https://issues.apache.org/jira/browse/YARN-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14123288#comment-14123288
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Allen Wittenauer commented on YARN-2438:
----------------------------------------

I'm going to assume you are talking about the defaults that are listed in the 
yarn-env.sh file?  The code sort of cheats.  The actual default is set by 
HADOOP_HEAPSIZE.  So really that default is a lie.  Good catch!

Looking at other stuff, I have a strong doubt that the yarn-policy file is 
actually used.  I'll file a separate jira to deprecate that.  The rest should 
get defined properly in the project init.

> yarn-env.sh cleanup
> -------------------
>
>                 Key: YARN-2438
>                 URL: https://issues.apache.org/jira/browse/YARN-2438
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 3.0.0
>            Reporter: Allen Wittenauer
>              Labels: newbie
>
> a) YARN_PROXYSERVER_OPTS and YARN_PROXYSERVER_HEAP are not documented 
> b) Defaults should get moved to yarn-config.sh instead of being specifically 
> set



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