HDFS-17834. Fix invalid HTTP links for DataNodes in IPv6 environment

[mynameis180]

NOTICE

This is a backport of HDFS-17834 from branch-3.4 to trunk.

What changes were proposed in this pull request?

This PR fixes HDFS-17834: HDFS Router Federation Health page generates invalid HTTP links for DataNodes in IPv6 environment.

Problem

The Router Federation Health page incorrectly handles IPv6 addresses when constructing DataNode HTTP links:

• Fails to properly parse IPv6 addresses from infoAddr and infoSecureAddr fields
• Incorrectly splits IPv6 addresses, mistaking address segments for port numbers
• Generates malformed URLs that don't conform to RFC 2732 standards for IPv6 literal addresses
• Results in unclickable links that prevent access to DataNode web interfaces

Solution

• Enhance address parsing logic to correctly handle both IPv4 and IPv6 address formats
• Properly extract port numbers from IPv6 addresses formatted as [address]:port
• Maintain backward compatibility with existing IPv4 address handling
• Ensure generated URLs follow RFC 2732 standards for IPv6 literal addresses

Example

Before: https://fe80:0:0:0:215:5dff:fe00:3110:50075 (invalid)
After: https://[fe80:0:0:0:215:5dff:fe00:3110]:50075 (valid)

How was this patch tested?

• Unit tests: Verified address parsing logic for both IPv4 and IPv6 formats
• Regression testing: Confirmed no impact on existing IPv4 functionality
• Manual testing: Validated in IPv6-enabled environments
• Link verification: Verified generated URLs are correctly formatted and accessible

Code Change Verification

• PR title starts with corresponding JIRA issue id (HDFS-17834)
• No new dependencies added
• Existing tests pass
• Code follows Hadoop coding standards

Original PR

This change was already committed and tested in branch-3.4.

Please review @slfan1989 @Hexiaoqiao

[hadoop-yetus]

💔 -1 overall

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+0 🆗	reexec	1m 4s		Docker mode activated.
			_ Prechecks _
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+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+0 🆗	jshint	0m 0s		jshint was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
			_ trunk Compile Tests _
+0 🆗	mvndep	8m 12s		Maven dependency ordering for branch
+1 💚	mvninstall	28m 27s		trunk passed
+1 💚	shadedclient	63m 13s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 30s		Maven dependency ordering for patch
+1 💚	mvninstall	2m 24s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	25m 0s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	asflicense	0m 37s	/results-asflicense.txt	The patch generated 1 ASF License warnings.
		95m 11s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8097/1/artifact/out/Dockerfile
GITHUB PR	#8097
Optional Tests	dupname asflicense shadedclient codespell detsecrets jshint
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Max. process+thread count	612 (vs. ulimit of 5500)
modules	C: hadoop-hdfs-project/hadoop-hdfs hadoop-hdfs-project/hadoop-hdfs-rbf U: hadoop-hdfs-project
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8097/1/console
versions	git=2.25.1 maven=3.9.11
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[mynameis180]

@steveloughran please fix you HADOOP-19696 ，the word "License" which was misspelled as "Li2cense" in the
license header of hadoop-cloud-storage.xml. This typo was causing the
ASF License check to fail.
@Hexiaoqiao

[steveloughran]

ooh, let me do that asap as a followup.

(actually, looks like this typo was in two other assembly xml files, I'd just copied it over from them. will fix everywhere)