HDFS-17855. ViewFS with linkMergeSlash generates invalid paths during listStatus/listLocatedStatus operations, causing InvalidPathException or incorrect path resolution

[koodin9]

Description of PR

ViewFS with linkMergeSlash generates invalid paths during listStatus/listLocatedStatus operations, causing InvalidPathException or incorrect path resolution.

How was this patch tested?

Added test codes

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 59s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 1s		codespell was not available.
+0 🆗	detsecrets	0m 1s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+0 🆗	mvndep	7m 52s		Maven dependency ordering for branch
+1 💚	mvninstall	28m 27s		trunk passed
+1 💚	compile	15m 42s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	15m 56s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	2m 54s		trunk passed
+1 💚	mvnsite	3m 43s		trunk passed
+1 💚	javadoc	2m 38s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	2m 35s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	3m 0s	/branch-spotbugs-hadoop-common-project_hadoop-common-warnings.html	hadoop-common-project/hadoop-common in trunk has 448 extant spotbugs warnings.
-1 ❌	spotbugs	4m 1s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in trunk has 291 extant spotbugs warnings.
+1 💚	shadedclient	29m 49s		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 29s		the patch passed
+1 💚	compile	15m 11s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	15m 11s		the patch passed
+1 💚	compile	16m 18s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	16m 18s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	3m 9s	/results-checkstyle-root.txt	root: The patch generated 1 new + 24 unchanged - 0 fixed = 25 total (was 24)
+1 💚	mvnsite	3m 42s		the patch passed
+1 💚	javadoc	2m 45s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	2m 41s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	7m 25s		the patch passed
+1 💚	shadedclient	29m 44s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	21m 58s		hadoop-common in the patch passed.
-1 ❌	unit	213m 18s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
-1 ❌	asflicense	1m 15s	/results-asflicense.txt	The patch generated 1 ASF License warnings.
		438m 13s

Reason	Tests
Failed junit tests	hadoop.hdfs.tools.TestDFSAdmin

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8102/1/artifact/out/Dockerfile
GITHUB PR	#8102
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux c19fc805b987 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / b5428d0
Default Java	Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8102/1/testReport/
Max. process+thread count	3475 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common hadoop-hdfs-project/hadoop-hdfs U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8102/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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