[jira] [Created] (HADOOP-19935) Windows: make preferIPv4Stack overridable, matching hadoop-functions.sh

["Siyao Meng (Jira)" <ji...@apache.org>]

Siyao Meng created HADOOP-19935:
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             Summary: 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


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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