Kirk True created KAFKA-19206:
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             Summary: AsyncKafkaConsumer hangs when NetworkClient fails 
authentication
                 Key: KAFKA-19206
                 URL: https://issues.apache.org/jira/browse/KAFKA-19206
             Project: Kafka
          Issue Type: Bug
          Components: clients, consumer
    Affects Versions: 4.0.0
            Reporter: Kirk True
            Assignee: Kirk True
             Fix For: 4.1.0


The ConsumerNetworkThread creates a new NetworkClient, which connects to and  
authenticates against a broker. If the authentication fails, the NetworkClient 
throws an error, causing the AsyncKafkaConsumer to close. During the consumer 
close process the ConsumerNetworkThread is closed, but it throws a 
NullPointerException when it attempts to use the requestManagers and/or 
networkClientDelegate objects.



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