[jira] [Updated] (YARN-728) Yarn and MR default classpath are wrong on Windows

["Mostafa Elhemali (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mostafa Elhemali updated YARN-728:
----------------------------------

    Attachment: YARN-728.patch

I've attached a patch in which I delete the default values in yarn-default and mapred-default, since I can't think of a way to encode the dynamic behavior here (these values are in the code so deleting them causes the right thing to happen). The patch also has a fix for the MRJobConfig code to use the correct default based on platform.
                
> Yarn and MR default classpath are wrong on Windows
> --------------------------------------------------
>
>                 Key: YARN-728
>                 URL: https://issues.apache.org/jira/browse/YARN-728
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>         Environment: Windows
>            Reporter: Mostafa Elhemali
>         Attachments: YARN-728.patch
>
>
> On Windows, the environment variables need to be used as %X% not $X as in Linux/Unix. This is handled in code in Yarn in the ApplicationConstants$Environment.$() method. However there are two problems in Windows today where this doesn't work:
> # In yarn-default.xml and mapred-default.xml, the yarn.application.classpath and mapreduce.application.classpath are defined with hard-coded values that use the Linux form (e.g. $HADOOP_CONF_HOME).
> # In MRJobConfig, the DEFAULT_MAPREDUCE_APPLICATION_CLASSPATH constant is defined using the Linux form for HADOOP_MAPRED_HOME: $HADOOP_MAPRED_HOME.
> This causes MR applications to fail on Windows because it can't find the MRAppMaster class because the classpath is wrong.

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