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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11890) Uber-JIRA: Hadoop should support IPv6
Date Wed, 23 Sep 2015 01:30:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14903780#comment-14903780
] 

Colin Patrick McCabe commented on HADOOP-11890:
-----------------------------------------------

Great.  I moved the "related" jiras to be subtasks.

Can you post a little bit more about what admins will have to do to use ipv6 on their cluster
when this branch is done?  Maybe some kind of design doc?

Reading through HADOOP-12122, it sounds like the goal is that if an admin sets {{HADOOP_ALLOW_IPV6}}
and then starts using ipv6 addresses in configuration XML files, everything will Just Work?
 Does setting {{HADOOP_ALLOW_IPV6}} also imply that we will prefer ipv6 addresses internally
when resolving hostnames to IP addresses in the software?  Or will the software continue to
resolve hostnames to a mix of ipv4 and ipv6 addresses?

If an admin configures ipv6 addresses in configuration XML files but does not set {{HADOOP_ALLOW_IPV6}},
what kind of error message do we display?

Are we going to introduce some utility functions to parse ipv6 addresses and ports?

One thing to keep in mind for this work is that for some people, DNS resolution is really
slow.  I have had patches -1ed in the past for introducing extra DNS resolution steps.  We
need to be careful not to introduce unnecessary DNS resolution calls (and no, we can't assume
everyone caches DNS lookups forever, even though many people do).

> Uber-JIRA: Hadoop should support IPv6
> -------------------------------------
>
>                 Key: HADOOP-11890
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11890
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: net
>            Reporter: Nate Edel
>            Assignee: Nate Edel
>              Labels: ipv6
>
> Hadoop currently treats IPv6 as unsupported.  Track related smaller issues to support
IPv6.
> (Current case here is mainly HBase on HDFS, so any suggestions about other test cases/workload
are really appreciated.)



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