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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11890) Uber-JIRA: Hadoop should support IPv6
Date Thu, 01 Sep 2016 20:39:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15456542#comment-15456542
] 

Allen Wittenauer commented on HADOOP-11890:
-------------------------------------------

After starting work on HADOOP-13365, it's become very clear that the way we set the default
for HADOOP_OPTS makes life significantly harder to do fancier things.  Given this branch's
intended purpose and it's relationship with the HADOOP_OPTS default, it's a great time to
actually fix it prior to 3.x stable.

So I'd like to throw this out there:

* We completely remove the default setting for HADOOP_OPTS out of hadoop_bootstrap (Sidenote:
hadoop-env.sh hasn't been read yet, so users can't set HADOOP_ALLOW_IPV6 in there to prevent
that code from getting activated anyway...)
* in hadoop_init (which will get called after hadoop-env.sh, .hadooprc, etc etc), if HADOOP_ALLOW_IPV6
= false, we hadoop_add_param the -Djava.net.preferIPv4Stack=true back in (use a key of java.net.preferIPv4Stack)
* change the description for HADOOP_OPTS in hadoop-env.sh (and anywhere else?) to basically
say that the default is empty.  Remove the text about ipv6 from both examples.
* Write the docs for HADOOP_ALLOW_IPV6 that basically says that if set to false (the default...
so that should get set in hadoop_bootstrap) it will attempt to block ipv6, including trying
to add -Djava.net.preferIPv4Stack=true to HADOOP_OPTS. (We say try because hadoop_add_param
may fail if the key used is already present.)

Thoughts?

> 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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