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https://issues.apache.org/jira/browse/YARN-11933?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shilun Fan resolved YARN-11933.
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Fix Version/s: 3.5.0
Hadoop Flags: Reviewed
Resolution: Fixed
> TestAMSimulator fails due to shared node labels store directory
> ---------------------------------------------------------------
>
> Key: YARN-11933
> URL: https://issues.apache.org/jira/browse/YARN-11933
> Project: Hadoop YARN
> Issue Type: Bug
> Components: scheduler-load-simulator
> Affects Versions: 3.5.1
> Reporter: Shilun Fan
> Assignee: Shilun Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.0
>
>
> *Problem*
> *TestAMSimulator* fails intermittently when running concurrently or
> repeatedly due to shared Node Labels Store directory conflicts. Multiple test
> instances write to the same default directory, causing interference and test
> failures.
> *Root Case*
> The test does not specify an independent Node Labels Store directory via
> YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR
> All test instances use the default shared path, leading to conflicts when:
> 1. Tests run in parallel
> 2. Multiple test executions overlap
> 3. Concurrent parameterized test cases execute
> *Solution*
> Create isolated temporary directories for each test instance:
> 1. Setup phase: Create a unique temporary directory for Node Labels Store and
> configure it via YarnConfiguration.FS_NODE_LABELS_STORE_ROOT_DIR
> 2.Teardown phase: Clean up the temporary directory to prevent resource leaks
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