John Roesler created KAFKA-9734:
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             Summary: Streams IllegalStateException in trunk during rebalance
                 Key: KAFKA-9734
                 URL: https://issues.apache.org/jira/browse/KAFKA-9734
             Project: Kafka
          Issue Type: Bug
          Components: streams
            Reporter: John Roesler
            Assignee: John Roesler


I have observed the following exception to kill a thread in the current trunk 
of Streams:
{noformat}
[2020-03-19 07:04:35,206] ERROR 
[stream-soak-test-e60443b4-aa2d-4107-abf7-ce90407cb70e-StreamThread-1] 
stream-thread [stream-soak-test-e60443b4-aa    
2d-4107-abf7-ce90407cb70e-StreamThread-1] Encountered the following exception 
during processing and the thread is going to shut down:  
(org.apache.kafka.streams.processor.internals.StreamThread)
java.lang.IllegalStateException: The changelog reader is not restoring active 
tasks while trying to transit to update standby tasks: {}
        at 
org.apache.kafka.streams.processor.internals.StoreChangelogReader.transitToUpdateStandby(StoreChangelogReader.java:303)
                                                                                
                         
        at 
org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:582)
        at 
org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:498)
        at 
org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:472){noformat}
Judging from the fact that the standby tasks are reported as an empty set, I 
think this is just a missed case in the task manager. PR to follow shortly.



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