Jason Gustafson created KAFKA-4135:
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             Summary: Inconsistent javadoc for KafkaConsumer.poll behavior when 
there is no subscription
                 Key: KAFKA-4135
                 URL: https://issues.apache.org/jira/browse/KAFKA-4135
             Project: Kafka
          Issue Type: Bug
          Components: consumer
            Reporter: Jason Gustafson
            Priority: Minor


Currently, the javadoc for {{KafkaConsumer.poll}} says the following: 
"It is an error to not have subscribed to any topics or partitions before 
polling for data." However, we don't actually raise an exception if this is the 
case. Perhaps we should?



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