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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2369) Environment variable handling assumes values should be appended
Date Mon, 04 May 2015 21:21:08 GMT

    [ https://issues.apache.org/jira/browse/YARN-2369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14527328#comment-14527328

Jason Lowe commented on YARN-2369:

bq. any thoughts on things that are missing from this latest patch or problems with the design?

+1 to the approach of using a whitelist for appendable variables.  I think this is a reasonable
approach to preserve compatibility, especially for admin vs. user variables like mapreduce.admin.user.env
vs. mapred.child.env.  It can be important for admin path settings like LD_LIBRARY_PATH to
not be completely smashed by user settings, as users love to forget to specify the path to
native hadoop libs when specifying LD_LIBRARY_PATH for their own libs.

> Environment variable handling assumes values should be appended
> ---------------------------------------------------------------
>                 Key: YARN-2369
>                 URL: https://issues.apache.org/jira/browse/YARN-2369
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Jason Lowe
>            Assignee: Dustin Cote
>         Attachments: YARN-2369-1.patch, YARN-2369-2.patch
> When processing environment variables for a container context the code assumes that the
value should be appended to any pre-existing value in the environment.  This may be desired
behavior for handling path-like environment variables such as PATH, LD_LIBRARY_PATH, CLASSPATH,
etc. but it is a non-intuitive and harmful way to handle any variable that does not have path-like

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