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https://issues.apache.org/jira/browse/HADOOP-16943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18094670#comment-18094670
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Siyao Meng commented on HADOOP-16943:
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Hi [~elukey], the lines have been refactored and removed by HADOOP-9902:
https://github.com/apache/hadoop/commit/31467453ec453f5df0ae29b5296c96d2514f2751
I'm closing this one.
> Allow IPv6 in hadoop-config.sh
> ------------------------------
>
> Key: HADOOP-16943
> URL: https://issues.apache.org/jira/browse/HADOOP-16943
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Luca Toscano
> Priority: Major
>
> Hi!
> I am currently using CDH 5.x and moving to BigTop 1.4 / 1.5 (so jumping from
> 2.6 to 2.8.5/2.10) but the following bit of hadoop-config.sh is always there:
> # Disable ipv6 as it can cause issues
> HADOOP_OPTS="$HADOOP_OPTS -Djava.net.preferIPv4Stack=true"
> Is there any reason to keep it? I tried to override it via daemon-specific
> environment variables, but in other daemons like Hive is not that easy (see
> [https://phabricator.wikimedia.org/T240255#5728881] for an example).
> IPv6 should be safe to use (IIRC hdfs was the main concern at the time but it
> was fixed HADOOP-11890).
> Thanks in advance,
> Luca
>
>
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