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YARN-11907: Fix queue starvation in FairSharePolicy when demand=0 but…#8127

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YARN-11907: Fix queue starvation in FairSharePolicy when demand=0 but…#8127
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ryukobayashi:YARN-11907

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@ryukobayashi ryukobayashi commented Dec 10, 2025 •
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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?

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hadoop-yetus commented Dec 10, 2025

💔 -1 overall

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_ trunk Compile Tests _
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_ Patch Compile Tests _
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-1 ❌ javac 0m 25s /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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-1 ❌ javadoc 0m 24s /patch-javadoc-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.
-1 ❌ spotbugs 0m 25s /patch-spotbugs-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt hadoop-yarn-server-resourcemanager in the patch failed.
-1 ❌ shadedclient 13m 56s patch has errors when building and testing our client artifacts.
_ Other Tests _
-1 ❌ unit 0m 28s /patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-server_hadoop-yarn-server-resourcemanager.txt hadoop-yarn-server-resourcemanager in the patch failed.
+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
uname Linux 8da7b6e155f5 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
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Default Java Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
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Test Results https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/1/testReport/
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
versions git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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hadoop-yetus commented Dec 10, 2025

💔 -1 overall

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_ trunk Compile Tests _
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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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+1 💚 javadoc 0m 25s the patch passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
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-1 ❌ shadedclient 8m 30s patch has errors when building and testing our client artifacts.
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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
Optional Tests dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname Linux 238bdd58a31c 5.15.0-156-generic #166-Ubuntu SMP Sat Aug 9 00:02:46 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
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Test Results https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/3/testReport/
Max. process+thread count 611 (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-8127/3/console
versions git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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hadoop-yetus commented Dec 10, 2025

💔 -1 overall

Vote Subsystem Runtime Logfile Comment
+0 🆗 reexec 1m 10s Docker mode activated.
_ Prechecks _
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_ trunk Compile Tests _
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-1 ❌ javac 0m 57s /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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+1 💚 asflicense 0m 34s The patch does not generate ASF License warnings.
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
Optional Tests dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname Linux fc02b89809b0 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
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git revision trunk / f800926
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-8127/2/testReport/
Max. process+thread count 584 (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-8127/2/console
versions git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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hadoop-yetus commented Dec 11, 2025

💔 -1 overall

Vote Subsystem Runtime Logfile Comment
+0 🆗 reexec 29m 10s Docker mode activated.
_ Prechecks _
+1 💚 dupname 0m 0s No case conflicting files found.
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_ trunk Compile Tests _
+1 💚 mvninstall 37m 47s trunk passed
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+1 💚 compile 1m 10s trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
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+1 💚 javadoc 0m 58s trunk passed with JDK Ubuntu-21.0.7+6-Ubuntu-0ubuntu120.04
+1 💚 javadoc 0m 55s trunk passed with JDK Ubuntu-17.0.15+6-Ubuntu-0ubuntu120.04
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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.
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
Optional Tests dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
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
Build tool maven
Personality dev-support/bin/hadoop.sh
git revision trunk / 68046ee
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-8127/4/testReport/
Max. process+thread count 937 (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-8127/4/console
versions git=2.25.1 maven=3.9.11 spotbugs=4.9.7
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