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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-3626) On Windows localized resources are not moved to the front of the classpath when they should be
Date Mon, 25 May 2015 20:02:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-3626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14558495#comment-14558495
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Chris Nauroth commented on YARN-3626:
-------------------------------------

Hi Craig.  This looks good to me.  I have just one minor nitpick.  I think the logic in {{ContainerLaunch}}
for setting {{preferLocalizedJars}} could be simplified to this:

{code}
boolean preferLocalizedJars = Boolean.valueOf(classpathPrependDistCache);
{code}

{{Boolean#valueOf}} is null-safe.

Thanks!

> On Windows localized resources are not moved to the front of the classpath when they
should be
> ----------------------------------------------------------------------------------------------
>
>                 Key: YARN-3626
>                 URL: https://issues.apache.org/jira/browse/YARN-3626
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: yarn
>         Environment: Windows
>            Reporter: Craig Welch
>            Assignee: Craig Welch
>             Fix For: 2.7.1
>
>         Attachments: YARN-3626.0.patch, YARN-3626.11.patch, YARN-3626.14.patch, YARN-3626.4.patch,
YARN-3626.6.patch, YARN-3626.9.patch
>
>
> In response to the mapreduce.job.user.classpath.first setting the classpath is ordered
differently so that localized resources will appear before system classpath resources when
tasks execute.  On Windows this does not work because the localized resources are not linked
into their final location when the classpath jar is created.  To compensate for that localized
jar resources are added directly to the classpath generated for the jar rather than being
discovered from the localized directories.  Unfortunately, they are always appended to the
classpath, and so are never preferred over system resources.



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