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https://issues.apache.org/jira/browse/KAFKA-3006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15064478#comment-15064478
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Gwen Shapira commented on KAFKA-3006:
-------------------------------------

I'm not seeing how stream processing frameworks are impacted. 

Stream processing frameworks ship with the Kafka Client as part of their 
libraries / dependencies, their users don't interact with Kafka directly (i.e. 
I depend on Spark libraries which bring whatever Kafka they need, and I only 
use Spark APIs, not Kafka ones). 

We are changing nothing on the broker side, so no matter which API they choose 
to go with, it will work. 

> Make collection default container type for sequences in the consumer API
> ------------------------------------------------------------------------
>
>                 Key: KAFKA-3006
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3006
>             Project: Kafka
>          Issue Type: Improvement
>          Components: clients
>    Affects Versions: 0.9.0.0
>            Reporter: Pierre-Yves Ritschard
>              Labels: patch
>
> 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() 
> , seekToBeginning(), seekToEnd(), 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 subscribe(Collection<String> topics, ConsumerRebalanceListener);
> void assign(Collection<TopicPartition> partitions);
> void pause(Collection<TopicPartition> partitions);
> void resume(Collection<TopicPartition> partitions);
> void seekToBeginning(Collection<TopicPartition>);
> void seekToEnd(Collection<TopicPartition>);
> {code}
> This issues supersedes KAFKA-2991



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