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https://issues.apache.org/jira/browse/KAFKA-8326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniyar Yeralin updated KAFKA-8326:
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Summary: Add Serde<List<Inner>> support (was: Add List<T> Serde)
> Add Serde<List<Inner>> support
> ------------------------------
>
> Key: KAFKA-8326
> URL: https://issues.apache.org/jira/browse/KAFKA-8326
> Project: Kafka
> Issue Type: Improvement
> Components: clients, streams
> Reporter: Daniyar Yeralin
> Assignee: Daniyar Yeralin
> Priority: Minor
> Labels: kip
>
> _This ticket proposes adding new {color:#4c9aff}ListSerializer{color} and
> {color:#4c9aff}ListDeserializer{color} classes as well as support for the new
> classes into the Serdes class. This will allow using List Serde of type_
> {color:#4c9aff}_<L extends List<T>, T>_{color} _directly from Consumers,
> Producers and Streams._
> _{color:#4c9aff}List<L>{color} serialization and deserialization will be done
> through repeatedly calling a serializer/deserializer for each entry provided
> by passed generic {color:#4c9aff}T{color}'s Serde. For example, if you want
> to create List of Strings serde, then serializer/deserializer of StringSerde
> will be used to serialize/deserialize each entry in
> {color:#4c9aff}List<String>{color}._
> I believe there are many use cases where List Serde could be used. Ex.
> [https://stackoverflow.com/questions/41427174/aggregate-java-objects-in-a-list-with-kafka-streams-dsl-windows],
>
> [https://stackoverflow.com/questions/46365884/issue-with-arraylist-serde-in-kafka-streams-api]
> For instance, aggregate grouped (by key) values together in a list to do
> other subsequent operations on the collection.
> KIP Link:
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-466%3A+Add+support+for+List%3CT%3E+serialization+and+deserialization]
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