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

Open ryukobayashi opened this issue 3 months ago • 4 comments

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:

  • [x] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
  • [x] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
  • [x] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
  • [x] If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

ryukobayashi avatar Dec 10 '25 04:12 ryukobayashi

:broken_heart: -1 overall

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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 https://github.com/apache/hadoop/pull/8127
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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
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Subsystem Report/Notes
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Vote Subsystem Runtime Logfile Comment
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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 https://github.com/apache/hadoop/pull/8127
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Console output https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-8127/4/console
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hadoop-yetus avatar Dec 11 '25 10:12 hadoop-yetus