[jira] [Created] (KAFKA-3854) Consecutive regex subscription calls fail

[Vahid Hashemian (JIRA)]

Vahid Hashemian created KAFKA-3854:
--------------------------------------

             Summary: Consecutive regex subscription calls fail
                 Key: KAFKA-3854
                 URL: https://issues.apache.org/jira/browse/KAFKA-3854
             Project: Kafka
          Issue Type: Bug
          Components: consumer
            Reporter: Vahid Hashemian
            Assignee: Vahid Hashemian


When consecutive calls are made to new consumer's [regex 
subscription|https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java#L850],
 like below: 

{code}
consumer.subscribe(Pattern.compile("..."), listener);
consumer.poll(0);

consumer.subscribe(Pattern.compile("f.."), listener);
consumer.poll(0);
{code}

the second call fails with the following error:

{code}
Exception in thread "main" java.lang.IllegalStateException: Subscription to 
topics, partitions and pattern are mutually exclusive
        at 
org.apache.kafka.clients.consumer.internals.SubscriptionState.subscribe(SubscriptionState.java:175)
        at 
org.apache.kafka.clients.consumer.KafkaConsumer.subscribe(KafkaConsumer.java:854)
        at 
ConsumerSubscriptionSemantics.tryRegexSubscriptionSemantics(ConsumerSubscriptionSemantics.java:76)
        at 
ConsumerSubscriptionSemantics.main(ConsumerSubscriptionSemantics.java:88)
{code}



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