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https://issues.apache.org/jira/browse/KAFKA-16955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rohan Desai updated KAFKA-16955:
--------------------------------
    Affects Version/s: 3.7.0

> ConcurrentModification exception thrown by KafkaStream threadState access
> -------------------------------------------------------------------------
>
>                 Key: KAFKA-16955
>                 URL: https://issues.apache.org/jira/browse/KAFKA-16955
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 3.7.0
>            Reporter: Rohan Desai
>            Priority: Major
>
> We see occasional ConcurrentModificationExceptions thrown when accessing 
> threadState:
>  
>  
> {code:java}
> 155.745service_application1 info[ERROR] 2024-06-11 07:56:42.417 
> [e2e-de9a85a4-b1d9-4807-bc34-e269f760bcd7-StreamThread-2] 
> ResponsiveKafkaStreams - stream-client 
> [e2e-de9a85a4-b1d9-4807-bc34-e269f760bcd7] Replacing thread in the streams 
> uncaught exception handler155.745service_application1 
> infoorg.apache.kafka.streams.errors.StreamsException: 
> java.util.ConcurrentModificationException155.745service_application1 info     
> at 
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:729)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info        at 
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:645)
>  [kafka-streams-3.7.0.jar:?]155.745service_application1 infoCaused by: 
> java.util.ConcurrentModificationException155.745service_application1 info at 
> java.util.HashMap$HashIterator.nextNode(HashMap.java:1605) 
> ~[?:?]155.745service_application1 info    at 
> java.util.HashMap$ValueIterator.next(HashMap.java:1633) 
> ~[?:?]155.745service_application1 info       at 
> org.apache.kafka.streams.KafkaStreams$StreamStateListener.maybeSetRunning(KafkaStreams.java:656)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info        at 
> org.apache.kafka.streams.KafkaStreams$StreamStateListener.onChange(KafkaStreams.java:686)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info       at 
> org.apache.kafka.streams.processor.internals.StreamThread.setState(StreamThread.java:261)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info       at 
> org.apache.kafka.streams.processor.internals.StreamThread.initializeAndRestorePhase(StreamThread.java:1120)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info     at 
> org.apache.kafka.streams.processor.internals.StreamThread.runOnceWithoutProcessingThreads(StreamThread.java:921)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info        at 
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:686)
>  ~[kafka-streams-3.7.0.jar:?]155.745service_application1 info        ... 1 
> more {code}
>  
>  



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