nodece commented on issue #16538:
URL: https://github.com/apache/pulsar/issues/16538#issuecomment-1207953544

   Thread blocked:
   ```
   "main" prio=0 tid=0x0 nid=0x0 waiting on condition
        java.lang.Thread.State: TIMED_WAITING
    on java.util.concurrent.CompletableFuture$Signaller@6d214cc3
        at [email protected]/jdk.internal.misc.Unsafe.park(Native Method)
        at 
[email protected]/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:252)
        at 
[email protected]/java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1866)
        at 
[email protected]/java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3463)
        at 
[email protected]/java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3434)
        at 
[email protected]/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1939)
        at 
[email protected]/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2095)
        at 
app//org.apache.pulsar.broker.service.BrokerService.lambda$unloadNamespaceBundlesGracefully$21(BrokerService.java:939)
        at 
app//org.apache.pulsar.broker.service.BrokerService$$Lambda$1486/0x00000008015f1c70.accept(Unknown
 Source)
        at [email protected]/java.lang.Iterable.forEach(Iterable.java:75)
        at 
app//org.apache.pulsar.broker.service.BrokerService.unloadNamespaceBundlesGracefully(BrokerService.java:930)
        at 
app//org.apache.pulsar.broker.service.BrokerService.unloadNamespaceBundlesGracefully(BrokerService.java:902)
        at 
app//org.apache.pulsar.broker.service.BrokerService.closeAsync(BrokerService.java:737)
        at 
app//org.apache.pulsar.broker.PulsarService.closeAsync(PulsarService.java:462)
        at 
app//org.apache.pulsar.functions.worker.PulsarFunctionTlsTest.tearDown(PulsarFunctionTlsTest.java:193)
        at 
[email protected]/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
        at 
[email protected]/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at 
[email protected]/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at [email protected]/java.lang.reflect.Method.invoke(Method.java:568)
        at 
app//org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
app//org.testng.internal.MethodInvocationHelper.invokeMethodConsideringTimeout(MethodInvocationHelper.java:61)
        at 
app//org.testng.internal.ConfigInvoker.invokeConfigurationMethod(ConfigInvoker.java:366)
        at 
app//org.testng.internal.ConfigInvoker.invokeConfigurations(ConfigInvoker.java:320)
        at 
app//org.testng.internal.TestInvoker.runConfigMethods(TestInvoker.java:701)
        at 
app//org.testng.internal.TestInvoker.runAfterGroupsConfigurations(TestInvoker.java:677)
        at 
app//org.testng.internal.TestInvoker.invokeMethod(TestInvoker.java:661)
        at 
app//org.testng.internal.TestInvoker.invokeTestMethod(TestInvoker.java:174)
        at 
app//org.testng.internal.MethodRunner.runInSequence(MethodRunner.java:46)
        at 
app//org.testng.internal.TestInvoker$MethodInvocationAgent.invoke(TestInvoker.java:822)
        at 
app//org.testng.internal.TestInvoker.invokeTestMethods(TestInvoker.java:147)
        at 
app//org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:146)
        at 
app//org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:128)
        at 
app//org.testng.TestRunner$$Lambda$161/0x0000000800d8c258.accept(Unknown Source)
        at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1511)
        at app//org.testng.TestRunner.privateRun(TestRunner.java:764)
        at app//org.testng.TestRunner.run(TestRunner.java:585)
        at app//org.testng.SuiteRunner.runTest(SuiteRunner.java:384)
        at app//org.testng.SuiteRunner.runSequentially(SuiteRunner.java:378)
        at app//org.testng.SuiteRunner.privateRun(SuiteRunner.java:337)
        at app//org.testng.SuiteRunner.run(SuiteRunner.java:286)
        at app//org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53)
        at app//org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:96)
        at app//org.testng.TestNG.runSuitesSequentially(TestNG.java:1218)
        at app//org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
        at app//org.testng.TestNG.runSuites(TestNG.java:1069)
        at app//org.testng.TestNG.run(TestNG.java:1037)
        at 
app//com.intellij.rt.testng.IDEARemoteTestNG.run(IDEARemoteTestNG.java:66)
        at 
app//com.intellij.rt.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:109)
   ```
   
   Make `unloadNamespaceBundlesGracefully` to async.


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