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https://issues.apache.org/jira/browse/HDFS-7834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335423#comment-14335423
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Allen Wittenauer commented on HDFS-7834:
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In trunk, you can set HADOOP_ALLOW_IPV6.
> Allow HDFS to bind to ipv6 conditionally
> ----------------------------------------
>
> Key: HDFS-7834
> URL: https://issues.apache.org/jira/browse/HDFS-7834
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Elliott Clark
> Assignee: Elliott Clark
>
> Currently the bash scripts unconditionally add -Djava.net.preferIPv4Stack=true
> While this was needed a while ago. IPV6 on java works much better now and
> there should be a way to allow it to bind dual stack if needed.
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