jihoonson opened a new issue #6139: Race in KafkaSupervisorTest.testCheckpointForUnknownTaskGroup() URL: https://github.com/apache/incubator-druid/issues/6139 The stacktrace is: ``` 2018-08-10T00:03:11,557 ERROR [KafkaSupervisor-testDS] io.druid.indexing.kafka.supervisor.KafkaSupervisor - KafkaSupervisor[testDS] failed to handle notice: {class=io.druid.indexing.kafka.supervisor.KafkaSupervisor, exceptionType=class io.druid.java.util.common.ISE, exceptionMessage=WTH?! cannot find taskGroup [0] among all taskGroups [{}], noticeClass=CheckpointNotice} io.druid.java.util.common.ISE: WTH?! cannot find taskGroup [0] among all taskGroups [{}] at io.druid.indexing.kafka.supervisor.KafkaSupervisor$CheckpointNotice.isValidTaskGroup(KafkaSupervisor.java:686) ~[classes/:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor$CheckpointNotice.handle(KafkaSupervisor.java:638) ~[classes/:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor$2.run(KafkaSupervisor.java:363) [classes/:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_161] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_161] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161] ``` The corresponding code is: ```java Assert.assertNotNull(serviceEmitter.getStackTrace()); ``` So, the issue is, `serviceEmitter.getStackTrace()` can return null when this check is called, so the test should wait for the stacktrace to be set.
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