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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6056) Use java.net.preferIPv4Stack to force IPv4
Date Sun, 12 Dec 2010 13:55:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970601#action_12970601
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Steve Loughran commented on HADOOP-6056:
----------------------------------------

I see that the Facebook scrips have this option set in hadoop-env.sh, and point to a sun bug
which causes sockets to hang when being opened on some linux systems as the reason for the
setting.

# work-around for http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6483406
export HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"

Given that FB are running large hadoop clusters, we know the java.net option does work at
scale, the only issue is is everyone happy with this patch going in to 0.22?

> 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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