YARN-11974. CS UI: comma-separated usernames in placement rule form

[myloginid]

Summary

Update the Apache Capacity Scheduler UI (hadoop-yarn-capacity-scheduler-ui) placement rule form to support comma-separated usernames in the Match Pattern field.

This is not Cloudera Manager or Queue Manager code — it is the upstream YARN Capacity Scheduler web UI shipped in hadoop-yarn-project.

Changes

• PlacementRuleForm.tsx — placeholder and help text for comma-separated usernames
• placement-rule-schema.ts — reject empty tokens between commas (e.g. alice,,bob)

Dependencies

• Requires YARN-11973 (RM engine) for comma-separated values to take effect at runtime

Related

• Parent: YARN-11972
• Engine PR: YARN-11973. RM engine: comma-separated username matching in placement rules #8656
• Docs PR: YARN-11975. Docs: comma-separated username syntax in CapacityScheduler.md #8658

Test plan

• Manual: enter alice,bob in user rule Match Pattern; verify save/load round-trip
• Manual: verify alice,,bob shows validation error

Sub-task of YARN-11972.
Fixes: https://issues.apache.org/jira/browse/YARN-11974

[myloginid]

Please add labels: trunk, YARN

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	7m 42s		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.
			_ trunk Compile Tests _
+1 💚	mvninstall	28m 40s		trunk passed
+1 💚	shadedclient	44m 19s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
-1 ❌	mvninstall	0m 36s	/patch-mvninstall-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-capacity-scheduler-ui.txt	hadoop-yarn-capacity-scheduler-ui in the patch failed.
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	14m 56s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 31s		The patch does not generate ASF License warnings.
		69m 24s

Subsystem	Report/Notes
Docker	ClientAPI=1.55 ServerAPI=1.55 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8657/1/artifact/out/Dockerfile
GITHUB PR	#8657
Optional Tests	dupname asflicense shadedclient codespell detsecrets
uname	Linux a4501107fe5f 5.15.0-181-generic #191-Ubuntu SMP Fri May 22 19:09:02 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 094cf7c
Max. process+thread count	634 (vs. ulimit of 10000)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8657/1/console
versions	git=2.43.0 maven=3.9.15
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

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[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 20s		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.
			_ trunk Compile Tests _
+1 💚	mvninstall	27m 25s		trunk passed
+1 💚	shadedclient	43m 27s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 47s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	shadedclient	15m 7s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	asflicense	0m 30s		The patch does not generate ASF License warnings.
		61m 21s

Subsystem	Report/Notes
Docker	ClientAPI=1.55 ServerAPI=1.55 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8657/2/artifact/out/Dockerfile
GITHUB PR	#8657
Optional Tests	dupname asflicense shadedclient codespell detsecrets
uname	Linux cf2313e6e480 5.15.0-181-generic #191-Ubuntu SMP Fri May 22 19:09:02 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 807e796
Max. process+thread count	640 (vs. ulimit of 10000)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-capacity-scheduler-ui
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8657/2/console
versions	git=2.43.0 maven=3.9.15
Powered by	Apache Yetus 0.14.1 https://yetus.apache.org

This message was automatically generated.

[Hean-Chhinling]

Thank you @myloginid for working on this.
LGTM!