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https://issues.apache.org/jira/browse/HDFS-7386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14208354#comment-14208354
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Chris Nauroth commented on HDFS-7386:
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Hi Yongjun.
On further reflection, I think we should not incorporate a Windows check here.
Sometimes the check for < 1024 is used on the client side to detect the
behavior of the server side. If we consider the possibility of a Windows
client connecting to a Linux server, then the client on Windows could assume
incorrectly that there are no privileged ports, even though the server on Linux
does have privileged ports. As a practical matter, I think this means that
when secure mode is fully implemented for Windows, there is going to be a
limitation that the DataNode can't use a port < 1024. Otherwise, it would
throw off some of this detection logic. It's not a bad limitation, just
something we'll need to be aware of.
> Replace check "port number < 1024" with shared isPrivilegedPort method
> -----------------------------------------------------------------------
>
> Key: HDFS-7386
> URL: https://issues.apache.org/jira/browse/HDFS-7386
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
>
> Per discussion in HDFS-7382, I'm filing this jira as a follow-up, to replace
> check "port number < 1024" with shared isPrivilegedPort method.
> Thanks [~cnauroth] for the work on HDFS-7382 and suggestion there.
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