[jira] [Created] (KAFKA-20764) StateUpdater moves tasks between collections unatomically which can lead to duplicates

[Nikita Shupletsov (Jira)]

Nikita Shupletsov created KAFKA-20764:
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             Summary: StateUpdater moves tasks between collections unatomically 
which can lead to duplicates
                 Key: KAFKA-20764
                 URL: https://issues.apache.org/jira/browse/KAFKA-20764
             Project: Kafka
          Issue Type: Bug
          Components: streams
    Affects Versions: 4.3.1
            Reporter: Nikita Shupletsov


we update task collections without acquiring the lock here 
[https://github.com/apache/kafka/blob/trunk/streams/src/main/java/org/apache/kafka/streams/processor/internals/DefaultStateUpdater.java#L679-L680]
 and here 
[https://github.com/apache/kafka/blob/trunk/streams/src/main/java/org/apache/kafka/streams/processor/internals/DefaultStateUpdater.java#L694-L695.]

Which may cause "Task not found in the state updater. This indicates a bug." 
due to duplicates in `tasks()`(the same task is present in two collections)



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