HDFS-17632. RBF: Support listOpenFiles for routers

[kokonguyen191]

Description of PR

(reopened due to ticket being auto closed)

Routers don't have support for listOpenFiles yet. Single destination paths are straightforward. Multi destination paths are joined; entries with inodeId > min(max(entry inodeIds)) are ignored to get a consistent prevId for the iterator.

The implementation is the same as the logic used for aligning results from multiple destinations in router getListing.

How was this patch tested?

UTs

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	8m 7s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		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	6m 59s		Maven dependency ordering for branch
+1 💚	mvninstall	15m 43s		trunk passed
+1 💚	compile	3m 5s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	3m 11s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 33s		trunk passed
+1 💚	mvnsite	1m 26s		trunk passed
+1 💚	javadoc	1m 3s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	1m 1s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	1m 58s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in trunk has 291 extant spotbugs warnings.
-1 ❌	spotbugs	1m 0s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-rbf-warnings.html	hadoop-hdfs-project/hadoop-hdfs-rbf in trunk has 192 extant spotbugs warnings.
+1 💚	shadedclient	14m 34s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 16s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 16s		the patch passed
+1 💚	compile	2m 58s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	2m 58s		the patch passed
+1 💚	compile	3m 12s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	3m 12s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	0m 32s		hadoop-hdfs-project: The patch generated 0 new + 38 unchanged - 1 fixed = 38 total (was 39)
+1 💚	mvnsite	1m 18s		the patch passed
+1 💚	javadoc	0m 53s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 54s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	3m 3s		the patch passed
+1 💚	shadedclient	14m 47s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	172m 57s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch passed.
+1 💚	unit	35m 14s		hadoop-hdfs-rbf in the patch passed.
+1 💚	asflicense	0m 29s		The patch does not generate ASF License warnings.
		297m 48s

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-8072/1/artifact/out/Dockerfile
GITHUB PR	#8072
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux f223f80c2115 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 / a1a738b
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-8072/1/testReport/
Max. process+thread count	4844 (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-8072/1/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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[ayushtkn]

does the output gives path wrt router mount points or the actual paths in the namespace, like /mnt mounts ns1 /dir/subdir1
so a file /dir/subdir1/file1 should be shown as /mnt1/file1 when doing getOpenFiles via router

[kokonguyen191]

does the output gives path wrt router mount points or the actual paths in the namespace, like /mnt mounts ns1 /dir/subdir1 so a file /dir/subdir1/file1 should be shown as /mnt1/file1 when doing getOpenFiles via router

@ayushtkn Thanks for the review! I have updated the implementation to return the mount source path instead of the actual paths

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 44s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		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	6m 26s		Maven dependency ordering for branch
+1 💚	mvninstall	15m 45s		trunk passed
+1 💚	compile	3m 4s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	3m 20s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 35s		trunk passed
+1 💚	mvnsite	1m 26s		trunk passed
+1 💚	javadoc	1m 5s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	1m 3s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	2m 0s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in trunk has 291 extant spotbugs warnings.
-1 ❌	spotbugs	1m 5s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-rbf-warnings.html	hadoop-hdfs-project/hadoop-hdfs-rbf in trunk has 192 extant spotbugs warnings.
+1 💚	shadedclient	15m 41s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 20s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 16s		the patch passed
+1 💚	compile	3m 9s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	3m 9s		the patch passed
+1 💚	compile	3m 19s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	3m 19s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 29s	/results-checkstyle-hadoop-hdfs-project.txt	hadoop-hdfs-project: The patch generated 1 new + 38 unchanged - 1 fixed = 39 total (was 39)
+1 💚	mvnsite	1m 18s		the patch passed
+1 💚	javadoc	0m 52s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 53s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	3m 8s		the patch passed
+1 💚	shadedclient	16m 58s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	175m 9s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
-1 ❌	unit	30m 55s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs-rbf.txt	hadoop-hdfs-rbf in the patch failed.
-1 ❌	asflicense	0m 25s	/results-asflicense.txt	The patch generated 1 ASF License warnings.
		292m 9s

Reason	Tests
Failed junit tests	hadoop.hdfs.tools.TestDFSAdmin
	hadoop.hdfs.server.balancer.TestBalancerWithHANameNodes

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8072/2/artifact/out/Dockerfile
GITHUB PR	#8072
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 50408cd6e00c 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 / f30dd43
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-8072/2/testReport/
Max. process+thread count	4395 (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-8072/2/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

This message was automatically generated.

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 45s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		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	6m 24s		Maven dependency ordering for branch
+1 💚	mvninstall	18m 51s		trunk passed
+1 💚	compile	3m 17s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	compile	3m 27s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	checkstyle	0m 34s		trunk passed
+1 💚	mvnsite	1m 28s		trunk passed
+1 💚	javadoc	1m 3s		trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	1m 1s		trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
-1 ❌	spotbugs	2m 2s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-warnings.html	hadoop-hdfs-project/hadoop-hdfs in trunk has 291 extant spotbugs warnings.
-1 ❌	spotbugs	1m 4s	/branch-spotbugs-hadoop-hdfs-project_hadoop-hdfs-rbf-warnings.html	hadoop-hdfs-project/hadoop-hdfs-rbf in trunk has 192 extant spotbugs warnings.
+1 💚	shadedclient	16m 37s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 21s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 16s		the patch passed
+1 💚	compile	3m 21s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javac	3m 21s		the patch passed
+1 💚	compile	3m 33s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	javac	3m 33s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
-0 ⚠️	checkstyle	0m 33s	/results-checkstyle-hadoop-hdfs-project.txt	hadoop-hdfs-project: The patch generated 2 new + 38 unchanged - 1 fixed = 40 total (was 39)
+1 💚	mvnsite	1m 26s		the patch passed
+1 💚	javadoc	0m 53s		the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 55s		the patch passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
+1 💚	spotbugs	3m 22s		the patch passed
+1 💚	shadedclient	17m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
-1 ❌	unit	172m 2s	/patch-unit-hadoop-hdfs-project_hadoop-hdfs.txt	hadoop-hdfs in the patch failed.
+1 💚	unit	36m 6s		hadoop-hdfs-rbf in the patch passed.
-1 ❌	asflicense	0m 28s	/results-asflicense.txt	The patch generated 1 ASF License warnings.
		299m 39s

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-8072/3/artifact/out/Dockerfile
GITHUB PR	#8072
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux e2b8fbb73de1 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 / 09a90a1
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-8072/3/testReport/
Max. process+thread count	4395 (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-8072/3/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
Powered by	Apache Yetus 0.14.0 https://yetus.apache.org

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