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https://issues.apache.org/jira/browse/KAFKA-8326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974570#comment-16974570
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Sophie Blee-Goldman commented on KAFKA-8326:
--------------------------------------------
Did we document this addition to the Serdes anywhere? We probably want to point
out the new feature somewhere, and should definitely add any new configs that
were introduced to the configs docs
> Add List<T> Serde
> -----------------
>
> 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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