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https://issues.apache.org/jira/browse/HADOOP-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12788345#action_12788345
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Todd Lipcon commented on HADOOP-6056:
-------------------------------------

bq. -1 tests included

This is a modification to the shell wrapper scripts, and thus isn't under the 
domain of unit tests.

Manual testing is slightly tricky, as on a well confgured cluster this won't 
have any particular impact. Steve, as the original reporter of the issue, do 
you have a system that you could test this on?

> Use java.net.preferIPv4Stack to force IPv4
> ------------------------------------------
>
>                 Key: HADOOP-6056
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6056
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Steve Loughran
>            Assignee: Todd Lipcon
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: hadoop-6056.txt
>
>
> This was mentioned on HADOOP-3427, there is a property,  
> java.net.preferIPv4Stack, which you set to true for the java net process to 
> switch to IPv4 everywhere. 
> As Hadoop doesn't work on IPv6, this should be set to true in the startup 
> scripts. Hopefully this will ensure that Jetty will also pick it up.

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