lbradstreet opened a new pull request #11710:
URL: https://github.com/apache/kafka/pull/11710


   MiniTrogdorCluster spins up agents from a different thread when
   scheduling them, but does not use volatiles in these objects. It's not
   clear that the updated fields are visible.
   
   The hope is that this will fix a failure where it test becomes stuck waiting 
for MiniTrogdorCluster to shutdown:
   ```
        Suppressed: java.lang.InterruptedException
                at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
                at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
                at 
java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1475)
                at 
java.util.concurrent.Executors$DelegatedExecutorService.awaitTermination(Executors.java:675)
                at 
org.apache.kafka.trogdor.coordinator.TaskManager.waitForShutdown(TaskManager.java:699)
                at 
org.apache.kafka.trogdor.coordinator.Coordinator.waitForShutdown(Coordinator.java:133)
                at 
org.apache.kafka.trogdor.common.MiniTrogdorCluster.close(MiniTrogdorCluster.java:289)
                at 
org.apache.kafka.trogdor.coordinator.CoordinatorTest.testTaskRequestWithOldStartMsGetsUpdated(CoordinatorTest.java:595)
                at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
                at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
                at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                at java.lang.reflect.Method.invoke(Method.java:498)
                at 
org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)
                at 
org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
                at 
org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
                at 
org.junit.jupiter.engine.extension.TimeoutInvocation.proceed(TimeoutInvocation.java:46)
   ```


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