lhotari commented on issue #10398:
URL: https://github.com/apache/pulsar/issues/10398#issuecomment-828272451


   Another flaky test with CoordinatorNotFoundException problem 
[here](https://github.com/apache/pulsar/pull/10371/checks?check_run_id=2455146689#step:9:529):
   ```
   Error:  Tests run: 7, Failures: 2, Errors: 0, Skipped: 4, Time elapsed: 
10.318 s <<< FAILURE! - in 
org.apache.pulsar.broker.transaction.coordinator.TransactionCoordinatorClientTest
   Error:  
testCommitAndAbort(org.apache.pulsar.broker.transaction.coordinator.TransactionCoordinatorClientTest)
  Time elapsed: 0.01 s  <<< FAILURE!
   
org.apache.pulsar.client.api.transaction.TransactionCoordinatorClientException$CoordinatorNotFoundException:
 Transaction coordinator with id 2 not found!
        at 
org.apache.pulsar.client.api.transaction.TransactionCoordinatorClientException.unwrap(TransactionCoordinatorClientException.java:126)
        at 
org.apache.pulsar.client.impl.transaction.TransactionCoordinatorClientImpl.newTransaction(TransactionCoordinatorClientImpl.java:155)
        at 
org.apache.pulsar.broker.transaction.coordinator.TransactionCoordinatorClientTest.testCommitAndAbort(TransactionCoordinatorClientTest.java:84)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:132)
        at 
org.testng.internal.InvokeMethodRunnable.runOne(InvokeMethodRunnable.java:45)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:73)
        at 
org.testng.internal.InvokeMethodRunnable.call(InvokeMethodRunnable.java:11)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
   ```
   
   @congbobo184 @gaoran10 please fix the source of flakiness in tests where the 
problem is about 
`TransactionCoordinatorClientException$CoordinatorNotFoundException` . Would 
you be able to take a look? It's this issue #10398 and #9917 & #9918 which are 
some of the examples.
   


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