Shilun Fan created YARN-11876:
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Summary: Fix AsyncDispatcher crash in TestAppManager
Key: YARN-11876
URL: https://issues.apache.org/jira/browse/YARN-11876
Project: Hadoop YARN
Issue Type: Improvement
Components: resourcemanager
Affects Versions: 3.5.0
Reporter: Shilun Fan
Assignee: Shilun Fan
h3. *Description*
After upgrading to {*}JUnit 5{*}, the {{ResourceManager}} module encounters a
crash when running unit tests. Specifically, the failure occurs in the test
case {{{}TestAppManager#testRMAppSubmitWithQueueChanged{}}}.
During application submission, the test changes the queue assignment, which
triggers a {{SchedulerEvent}} that the {{AsyncDispatcher}} cannot handle.
As a result, the dispatcher thread throws an exception and terminates, causing
the test JVM to exit abnormally with a {{{}SurefireBooterForkException{}}}.
*Error Details*
{code:java}
2025-10-08 07:56:46,833 ERROR [AsyncDispatcher event handler]
event.AsyncDispatcher (MarkerIgnoringBase.java:error(159)) - Error in
dispatcher thread
java.lang.Exception: No handler registered for class
org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEventType
at
org.apache.hadoop.yarn.event.AsyncDispatcher.dispatch(AsyncDispatcher.java:277)
at
org.apache.hadoop.yarn.event.AsyncDispatcher$1.run(AsyncDispatcher.java:162)
at java.lang.Thread.run(Thread.java:750) {code}
This leads to Maven Surefire reporting a forked VM crash:
{code:java}
org.apache.maven.surefire.booter.SurefireBooterForkException:
ExecutionException The forked VM terminated without properly saying goodbye. VM
crash or System.exit called?
Process Exit Code: 255
Crashed tests: org.apache.hadoop.yarn.server.resourcemanager.TestAppManager
{code}
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