[jira] [Assigned] (KAFKA-20518) Allow configuring a default StreamPartitioner

["Alan Lau (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-20518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alan Lau reassigned KAFKA-20518:
--------------------------------

    Assignee: Alan Lau

> Allow configuring a default StreamPartitioner
> ---------------------------------------------
>
>                 Key: KAFKA-20518
>                 URL: https://issues.apache.org/jira/browse/KAFKA-20518
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Stef Noten
>            Assignee: Alan Lau
>            Priority: Minor
>
> Similar to configuring the default {{{}Serde{}}}s, it would be useful to be able to configure a default {{{}StreamPartitioner{}}}.
> Often, you want to treat certain keys always in the same manner. Currently such a decision translates into configuration of the partitioner on every possible operation, e.g. with foreign-key joins or groupings. Moreover, many automatic repartitions are subtly triggered downstream by making a small change upstream (e.g. changing {{processValues}} to a {{{}process{}}}). It's easy to make mistakes against this, especially as it's also not possible to verify partitioning with {{TopologyTestDriver}} nor with validations on the {{{}TopologyDescription{}}}.
> An example: in our application we have many composite record keys, which should always be partitioned by the first part. With a default partitioner, it would be possible to do automatic correct partitioning by e.g. key class type, annotation, implementing an interface, ...



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