ferdelyi opened a new pull request, #7979:
URL: https://github.com/apache/hadoop/pull/7979
To enable dual-stack or IPv6 support, use InetAddress.getAllByName(hostname)
to resolve the IP addresses of a host. When the system property
java.net.preferIPv4Stack is set to true, only IPv4 addresses are returned, and
any IPv6 addresses are ignored, so no extra check is needed to exclude IPv6.
When java.net.preferIPv4Stack is false, both IPv4 and IPv6 addresses may be
returned, and any IPv6 addresses will also be added as connectors. To disable
IPv4, you need to configure the OS at the system level.
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