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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2026/07/08 21:05:00 UTC
[jira] [Commented] (HADOOP-19935) Windows: make preferIPv4Stack overridable, matching hadoop-functions.sh
[ https://issues.apache.org/jira/browse/HADOOP-19935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18094688#comment-18094688 ]
ASF GitHub Bot commented on HADOOP-19935:
-----------------------------------------
smengcl opened a new pull request, #8592:
URL: https://github.com/apache/hadoop/pull/8592
### Description of PR
Prompted by [HADOOP-16943](https://issues.apache.org/jira/browse/HADOOP-16943), I noticed that Windows hadoop-config.cmd still disables IPv6.
On Unix the IPv4 pin has been overridable since [HADOOP-9902](https://issues.apache.org/jira/browse/HADOOP-9902): hadoop-functions.sh uses `${HADOOP_OPTS:-"-Djava.net.preferIPv4Stack=true"}`, so setting HADOOP_OPTS selects dual-stack or IPv6. hadoop-config.cmd never matched it. It appended the pin unconditionally, so IPv6 could not be enabled on Windows at all.
Apply the pin only when HADOOP_OPTS is unset, mirroring the Unix default. IPv4 stays the default when HADOOP_OPTS is unset; operators who set it can now choose dual-stack or IPv6.
### How was this patch tested?
n/a. There's no Windows CI.
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> Windows: make preferIPv4Stack overridable, matching hadoop-functions.sh
> -----------------------------------------------------------------------
>
> Key: HADOOP-19935
> URL: https://issues.apache.org/jira/browse/HADOOP-19935
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: scripts
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
>
> Prompted by HADOOP-16943, I noticed that Windows hadoop-config.cmd still disables IPv6.
> On Unix the IPv4 pin has been overridable since HADOOP-9902 (2014): hadoop-functions.sh uses {{{}$\{HADOOP_OPTS:-"-Djava.net.preferIPv4Stack=true"{}}}}, so setting {{HADOOP_OPTS}} selects dual-stack or IPv6. hadoop-config.cmd never matched it. It appended the pin unconditionally, so IPv6 could not be enabled on Windows at all.
> Proposal: Apply the pin only when {{HADOOP_OPTS}} is unset, mirroring the Unix default. IPv4 stays the default when {{HADOOP_OPTS}} is unset; operators who set it can now choose dual-stack or IPv6.
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