Allen Wittenauer commented on YARN-3000:

It's worth pointing out that YARN_PID_DIR is effectively deprecated in trunk.  
The variable is still honored, but HADOOP_PID_DIR is documented and used as the 

> YARN_PID_DIR should be visible in yarn-env.sh
> ---------------------------------------------
>                 Key: YARN-3000
>                 URL: https://issues.apache.org/jira/browse/YARN-3000
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 2.6.0
>            Reporter: Jeff Zhang
>            Assignee: Rohith
>            Priority: Minor
>         Attachments: 0001-YARN-3000.patch
> Currently I see YARN_PID_DIR only show in yarn-deamon.sh which is supposed 
> not the place for user to set up enviroment variable. IMO, yarn-env.sh is the 
> place for users to set up enviroment variable just like hadoop-env.sh, so 
> it's better to put YARN_PID_DIR into yarn-env.sh. ( can put it into comment 

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