YARN-11907: Fix queue starvation in FairSharePolicy when demand=0 but…

[ryukobayashi]

Description of PR

Fix queue starvation in FairSharePolicy when queues have pending applications

Problem

FairSharePolicy causes queue starvation when a queue has pending applications waiting for AM allocation but no running containers yet (demand=0, getNumRunnableApps()>0). The queue receives no allocations despite having pending applications and
configured minShare guarantees.

Root Cause

compareDemand() treats all queues with demand=0 as empty and assigns lowest priority, blocking progression to minShare comparison stage.

Solution

Modified compareDemand() to distinguish truly empty queues (getNumRunnableApps()==0) from queues with pending applications (getNumRunnableApps()>0). Queues with pending applications now progress to minShare comparison, preventing starvation.

Testing

Added TestFairSharePolicyPendingApps with 4 test cases covering pending app scenarios and minShare comparison.

How was this patch tested?

Add the unit test.

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

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			_ trunk Compile Tests _
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			_ Patch Compile Tests _
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			_ Other Tests _
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+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		103m 57s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/1/artifact/out/Dockerfile
GITHUB PR	#8127
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
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Max. process+thread count	586 (vs. ulimit of 5500)
modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/1/console
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-1 ❌	javac	0m 30s	/patch-compile-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager-jdkUbuntu-17.0.15+6-Ubuntu-0ubuntu120.04.txt	hadoop-yarn-server-resourcemanager in the patch failed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04.
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			_ Other Tests _
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+1 💚	asflicense	0m 19s		The patch does not generate ASF License warnings.
		53m 0s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/3/artifact/out/Dockerfile
GITHUB PR	#8127
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Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/3/console
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			_ trunk Compile Tests _
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		104m 44s

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/2/artifact/out/Dockerfile
GITHUB PR	#8127
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Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/2/console
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+1 💚	asflicense	0m 34s		The patch does not generate ASF License warnings.
		265m 11s

Reason	Tests
Failed junit tests	hadoop.yarn.server.resourcemanager.TestRMHA
	hadoop.yarn.server.resourcemanager.scheduler.capacity.TestLeafQueue

Subsystem	Report/Notes
Docker	ClientAPI=1.52 ServerAPI=1.52 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/4/artifact/out/Dockerfile
GITHUB PR	#8127
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uname	Linux 18a1c2c57cfb 5.15.0-153-generic #163-Ubuntu SMP Thu Aug 7 16:37:18 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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modules	C: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager U: hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/4/console
versions	git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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