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https://issues.apache.org/jira/browse/HADOOP-3619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068691#comment-14068691
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Steve Loughran commented on HADOOP-3619:
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# tests must not hit remote addresses; it stops them working offline/on 
isolated networks, and impacts determinism. 
# as the logic is broken up into some static methods, the test cases could go 
to each of them (e.g .create a private subclass of InetAddress; verify that 
this is recognised, ...others)
# I don't like the exception text either. Something like "Unrecognised address 
format", maybe with a matching wiki link.

Still: best effort on IPv6 in Hadoop so far...

> DNS.getHosts triggers an ArrayIndexOutOfBoundsException in reverseDNS if one 
> of the interfaces is IPv6
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3619
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3619
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: net
>            Reporter: Steve Loughran
>            Assignee: Dr. Martin Menzel
>              Labels: ipv6, patch
>         Attachments: HADOOP-3619-v2.patch
>
>
> reverseDNS tries to split a host address string by ".", and so fails if ":" 
> is the separator, as it is in IPv6. When it tries to access the parts of the 
> address, a stack trace is seen.



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