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https://issues.apache.org/jira/browse/KAFKA-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Noll updated KAFKA-4875:
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Summary: Kafka Streams: topic groups and builder.stream API (was: Kafka
streams topic groups and builder.stream API)
> Kafka Streams: topic groups and builder.stream API
> --------------------------------------------------
>
> Key: KAFKA-4875
> URL: https://issues.apache.org/jira/browse/KAFKA-4875
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Eno Thereska
> Fix For: 0.11.0.0
>
>
> One thing that has come up in mailing list is that the notion of topic groups
> is unclear. So if you have 2 topics, each with 3 partitions, you'd expect 6
> tasks. However, if you do `builder.stream(topic1, topic2)` you actually get
> only 3 tasks created. If you do `builder.stream(topic1);
> builder.stream(topic2)` you get 6 tasks, i.e., parallelism is increased. So
> the same application, calling builder.stream() in two different ways, might
> see different performance.
> In the Kafka Streams documentations we mention partitions and tasks, but not
> topic groups. We also do not document the effects of using builder.stream
> with a topic array. We also need to revisit whether the API and its effects
> are confusing.
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