[jira] [Created] (KAFKA-2991) Improve collection type consistency in KafkaConsumer API

["Jason Gustafson (JIRA)" <ji...@apache.org>]

Jason Gustafson created KAFKA-2991:
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             Summary: Improve collection type consistency in KafkaConsumer API
                 Key: KAFKA-2991
                 URL: https://issues.apache.org/jira/browse/KAFKA-2991
             Project: Kafka
          Issue Type: Improvement
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson


The KafkaConsumer API has some annoying inconsistencies in the usage of collection types. For example, subscribe() takes a list, but subscription() returns a set. Similarly for assign() and assignment(). We also have pause() and resume() which annoyingly use a variable argument array, which means you have to copy the result of assignment() to an array if you want to pause all assigned partitions. We can solve these issues by adding the following variants:

{code}
void subscribe(Collection<String> topics);
void assign(Collection<TopicPartition> partitions);
void pause(Collection<TopicPartition> partitions);
void resume(Collection<TopicPartition> partitions);
{code}

I'm not actually sure that there is any need for the generic Collection, so an alternative would be to just use Set.



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