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https://issues.apache.org/jira/browse/KAFKA-8326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16834053#comment-16834053
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Daniyar Yeralin edited comment on KAFKA-8326 at 5/7/19 1:26 AM:
----------------------------------------------------------------
TODO: once implementation is finalized and approved, proceed with writing test
cases for List Serde
was (Author: daniyar94):
TODO: once implementation is finalized and approved proceed with writing test
cases for List Serde
> 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
>
> I propose _adding new ListSerializer and ListDeserializer classes as well as
> support for the new classes into the Serdes class. This will allow using
> List<T> Serde directly from Consumers, Producers and Streams._
> _List<T> serialization and deserialization will be done through repeatedly
> calling a serializer/deserializer for each entry provided by passed generic
> T's Serde._
> _For example, if you want to create List of Strings serde, you will have to
> declare `new Serdes.ListSerde<>(Serdes.String(),
> Comparator.comparing(String::length))`, in this case serializer/deserializer
> of String Serde will be used to serialize/deserialize each entry in
> `List<String>`._
> 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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