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https://issues.apache.org/jira/browse/HADOOP-6056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794234#action_12794234
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Steve Loughran commented on HADOOP-6056:
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>What would need to be done to allow Hadoop to work with IPv6?
# a valid reason. Within a datacentre, there's a cost to IPv6, as your packet
size just got bigger. Most people use 10. subnets except for those of us with
more than one Class A subnet to hand.
# it will complicate your test and release process setup no-end, as you now
need to test on both network families.
> 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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