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https://issues.apache.org/jira/browse/KAFKA-2991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059145#comment-15059145
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Jason Gustafson commented on KAFKA-2991:
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[~jkreps] It's a little annoying to do so, but we won't break compatibility if
we leave the current methods around.
> 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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