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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6056) Use java.net.preferIPv4Stack to force IPv4
Date Mon, 05 Jul 2010 10:38:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885174#action_12885174
] 

Steve Loughran commented on HADOOP-6056:
----------------------------------------

I don't start my machines via the shell scripts, so can't say whether or not it works; i've
tweaked how my own JVMs start and added some in-JVM tests for IPV4

looking at the code, my main concern is what happens if there isn't an /sbin/sysctl on the
path, like on cygwin, OS/X or other systems. We probably need a check round there to look
for that function before calling it...

> 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: Michele Catasta
>             Fix For: 0.22.0
>
>         Attachments: HADOOP-6056.patch, 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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