HADOOP-19988: Register /mapreduce/app in MR AM tracking URL

[riya2305]

Description of PR

On the YARN UI clicking on the application tracking URL results in 404; Appending /mapreduce/app at the end of URL will render to the correct page.

How was this patch tested?

tested patch manually

For code changes:

• Does the title of this PR start 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? Note: Automated CI
  testing doesn't cover all cases so manual testing with cloud storage is still
  required.
• 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 55s		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	2m 5s		Maven dependency ordering for branch
+1 💚	mvninstall	51m 19s		trunk passed
+1 💚	compile	17m 50s		trunk passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	compile	18m 11s		trunk passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	checkstyle	6m 1s		trunk passed
+1 💚	mvnsite	2m 54s		trunk passed
+1 💚	javadoc	2m 34s		trunk passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javadoc	2m 34s		trunk passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	spotbugs	4m 15s		trunk passed
+1 💚	shadedclient	35m 8s		branch has no errors when building and testing our client artifacts.
-0 ⚠️	patch	35m 48s		Used diff version of patch file. Binary files and potentially other changes not applied. Please rebase and squash commits if necessary.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 29s		Maven dependency ordering for patch
+1 💚	mvninstall	1m 22s		the patch passed
+1 💚	compile	18m 31s		the patch passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javac	18m 31s		the patch passed
+1 💚	compile	21m 1s		the patch passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	javac	21m 1s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	6m 3s		the patch passed
+1 💚	mvnsite	2m 52s		the patch passed
+1 💚	javadoc	2m 38s		the patch passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javadoc	2m 38s		the patch passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	spotbugs	4m 45s		the patch passed
+1 💚	shadedclient	35m 19s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	1m 57s		hadoop-yarn-server-web-proxy in the patch passed.
+1 💚	unit	1m 31s		hadoop-mapreduce-client-common in the patch passed.
+1 💚	unit	8m 58s		hadoop-mapreduce-client-app in the patch passed.
+1 💚	asflicense	1m 14s		The patch does not generate ASF License warnings.
		261m 19s

Subsystem	Report/Notes
Docker	ClientAPI=1.56 ServerAPI=1.56 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/1/artifact/out/Dockerfile
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 9c18c410cdfd 5.15.0-185-generic #195-Ubuntu SMP Fri Jun 19 17:11:50 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 7609530
Default Java	Ubuntu-17.0.20+8-1-24.04-Ubuntu
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.12+8-1-24.04-Ubuntu /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.20+8-1-24.04-Ubuntu
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/1/testReport/
Max. process+thread count	581 (vs. ulimit of 10000)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/1/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.7
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[Hean-Chhinling]

Thanks for the patch @riya2305!
LGTM!

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 2s		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	2m 9s		Maven dependency ordering for branch
+1 💚	mvninstall	26m 16s		trunk passed
+1 💚	compile	8m 54s		trunk passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	compile	8m 55s		trunk passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	checkstyle	3m 4s		trunk passed
+1 💚	mvnsite	1m 16s		trunk passed
+1 💚	javadoc	1m 14s		trunk passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javadoc	1m 11s		trunk passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	spotbugs	1m 50s		trunk passed
+1 💚	shadedclient	16m 10s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+0 🆗	mvndep	0m 17s		Maven dependency ordering for patch
+1 💚	mvninstall	0m 37s		the patch passed
+1 💚	compile	8m 13s		the patch passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javac	8m 13s		the patch passed
+1 💚	compile	8m 54s		the patch passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	javac	8m 54s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	2m 56s		the patch passed
+1 💚	mvnsite	1m 21s		the patch passed
+1 💚	javadoc	1m 11s		the patch passed with JDK Ubuntu-21.0.12+8-1-24.04-Ubuntu
+1 💚	javadoc	1m 9s		the patch passed with JDK Ubuntu-17.0.20+8-1-24.04-Ubuntu
+1 💚	spotbugs	1m 53s		the patch passed
+1 💚	shadedclient	16m 10s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	1m 22s		hadoop-yarn-server-web-proxy in the patch passed.
+1 💚	unit	6m 41s		hadoop-mapreduce-client-app in the patch passed.
+1 💚	asflicense	0m 48s		The patch does not generate ASF License warnings.
		135m 12s

Subsystem	Report/Notes
Docker	ClientAPI=1.56 ServerAPI=1.56 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/2/artifact/out/Dockerfile
GITHUB PR	#8727
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 4bca877132c4 5.15.0-190-generic #200-Ubuntu SMP Fri Aug 7 15:06:04 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 6b4f941
Default Java	Ubuntu-17.0.20+8-1-24.04-Ubuntu
Multi-JDK versions	/usr/lib/jvm/java-21-openjdk-amd64:Ubuntu-21.0.12+8-1-24.04-Ubuntu /usr/lib/jvm/java-17-openjdk-amd64:Ubuntu-17.0.20+8-1-24.04-Ubuntu
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/2/testReport/
Max. process+thread count	752 (vs. ulimit of 10000)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-web-proxy hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app U: .
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8727/2/console
versions	git=2.43.0 maven=3.9.15 spotbugs=4.9.7
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

This message was automatically generated.

[riya2305]

@slfan1989 can you please review and merge this, thanks.

[Hean-Chhinling]

After looking at it more closer, I could some flaws on this PR.

1. Shouldn't the test be at TestAMWebApp.java instead of TestProxyUriUtils.java?
2. I think the ticket shall be at MAPREDUCE project instead of HADOOP.
3. I found a similar changes before here. Shall it be linked with each other? https://issues.apache.org/jira/browse/MAPREDUCE-7533
   And it would be nice to explain what was wrong with MAPREDUCE-7533 that why this PR is needed.