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]
```
[ Full content available at:
https://github.com/apache/incubator-druid/issues/6296 ]
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