Tomas Benc created KAFKA-4189:

             Summary: Consumer poll hangs forever if kafka is disabled
                 Key: KAFKA-4189
             Project: Kafka
          Issue Type: Bug
          Components: clients, consumer
    Affects Versions:,
            Reporter: Tomas Benc
            Priority: Critical

We develop web application, where client sends REST request and our application 
downloads messages from Kafka and sends those messages back to client. In our 
web application we use "New Consumer API" (not High Level nor Simple Consumer 
Problem occurs in case of disabling Kafka and web application is running on. 
Application receives request and tries to poll messages from Kafka. Processing 
is on that line blocked until Kafka is enabled.

ConsumerRecords<byte[], byte[]> records = consumer.poll(1000);

Timeout parameter of the poll method has no influence in such case. I expect 
poll method could throw some Exception describing about connection issues.

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