leventov commented on issue #6296: Transient failure of KafkaSupervisorTest.testCheckpointForInactiveTaskGroup URL: https://github.com/apache/incubator-druid/issues/6296#issuecomment-418539967 Apparently there is also some race in `KafkaSupervisor`: ``` java.lang.NullPointerException at org.apache.druid.indexing.kafka.supervisor.KafkaSupervisor.checkPendingCompletionTasks(KafkaSupervisor.java:1694) ~[classes/:?] at org.apache.druid.indexing.kafka.supervisor.KafkaSupervisor.runInternal(KafkaSupervisor.java:902) ~[classes/:?] at org.apache.druid.indexing.kafka.supervisor.KafkaSupervisor$RunNotice.handle(KafkaSupervisor.java:614) ~[classes/:?] at org.apache.druid.indexing.kafka.supervisor.KafkaSupervisor$2.run(KafkaSupervisor.java:386) [classes/:?] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_162] at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_162] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_162] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_162] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_162] ```
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