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https://issues.apache.org/jira/browse/HADOOP-11890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14903780#comment-14903780
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Colin Patrick McCabe commented on HADOOP-11890:
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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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