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https://issues.apache.org/jira/browse/HADOOP-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980592#action_12980592
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Todd Lipcon commented on HADOOP-6056:
-------------------------------------
I tested this patch a few ways:
- echoed HADOOP_OPTS to verify new parameter is there
- changed the sysctl path to an invalid one to simulate what happens on a
system without sysctl - no error is printed or anything, just skips through due
to 2>/dev/null
- changed my sysctl value to 1 and verified error message printed
- changed sysctl back to 0 and verified hadoop script still runs
Unless I hear otherwise I plan to commit this in the next few days
> 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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