[jira] [Created] (KAFKA-5846) Use singleton NoOpConsumerRebalanceListener in subscribe() call where listener is not specified

["Ted Yu (JIRA)" <ji...@apache.org>]

Ted Yu created KAFKA-5846:
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             Summary: Use singleton NoOpConsumerRebalanceListener in subscribe() call where listener is not specified
                 Key: KAFKA-5846
                 URL: https://issues.apache.org/jira/browse/KAFKA-5846
             Project: Kafka
          Issue Type: Task
            Reporter: Ted Yu
            Priority: Minor


Currently KafkaConsumer creates instance of NoOpConsumerRebalanceListener for each subscribe() call where ConsumerRebalanceListener is not specified:
{code}
    public void subscribe(Pattern pattern) {
        subscribe(pattern, new NoOpConsumerRebalanceListener());
{code}
We can create a singleton NoOpConsumerRebalanceListener to be used in such scenarios.



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