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Posted to jira@kafka.apache.org by "Damian Guy (JIRA)" <ji...@apache.org> on 2018/02/01 11:35:00 UTC
[jira] [Updated] (KAFKA-4875) Kafka Streams: topic groups and
builder.stream API
[ https://issues.apache.org/jira/browse/KAFKA-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Damian Guy updated KAFKA-4875:
------------------------------
Fix Version/s: (was: 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
> Priority: Major
>
> 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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