[jira] [Updated] (KAFKA-8949) MockConsumer.assign and ConsumerRebalanceListener

["David Hay (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-8949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Hay updated KAFKA-8949:
-----------------------------
    Description: 
Using MockConsumer, one must either use {{assign}} or {{subscribe}}, not both.  However, if you decide to use the {{assign}} method, there is not an easy way to register a ConsumerPartitionListener that will get called when {{assign}} is called.  Doing the following prevents the error message, but the listener still isn't fired:
{code:java}
MockConsumer consumer = new MockConsumer();
consumer.subscribe(Collections.singletonList("test.topic"), listener);
consumer.unsubscribe();
consumer.assign(Arrays.asList(new TopicPartition("test.topic", 1), ...)){code}
Would be nice to do something like:
{code:java}
MockConsumer consumer = new MockConsumer();
consumer.registerRebalanceListener();
consumer.assign(...){code}

  was:
Using MockConsumer, one must either use {{assign}} or {{subscribe}}, not both.  However, if you decide to use the {{assign}} method, there is not an easy way to register a ConsumerPartitionListener that will get called when {{assign}} is called.  The current work around is to do the following:
{code:java}
MockConsumer consumer = new MockConsumer();
consumer.subscribe(Collections.singletonList("test.topic"), listener);
consumer.unsubscribe();
consumer.assign(Arrays.asList(new TopicPartition("test.topic", 1), ...)){code}
Would be nice to do something like:
{code:java}
MockConsumer consumer = new MockConsumer();
consumer.registerRebalanceListener();
consumer.assign(...){code}


> MockConsumer.assign and ConsumerRebalanceListener
> -------------------------------------------------
>
>                 Key: KAFKA-8949
>                 URL: https://issues.apache.org/jira/browse/KAFKA-8949
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: David Hay
>            Priority: Major
>
> Using MockConsumer, one must either use {{assign}} or {{subscribe}}, not both.  However, if you decide to use the {{assign}} method, there is not an easy way to register a ConsumerPartitionListener that will get called when {{assign}} is called.  Doing the following prevents the error message, but the listener still isn't fired:
> {code:java}
> MockConsumer consumer = new MockConsumer();
> consumer.subscribe(Collections.singletonList("test.topic"), listener);
> consumer.unsubscribe();
> consumer.assign(Arrays.asList(new TopicPartition("test.topic", 1), ...)){code}
> Would be nice to do something like:
> {code:java}
> MockConsumer consumer = new MockConsumer();
> consumer.registerRebalanceListener();
> consumer.assign(...){code}



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