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Guozhang Wang updated KAFKA-4875: --------------------------------- Fix Version/s: (was: 1.0.0) 1.1.0 > 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: 1.1.0 > > > 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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)