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https://issues.apache.org/jira/browse/KAFKA-3801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15325209#comment-15325209
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Guozhang Wang commented on KAFKA-3801:
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I think a general question here, that we are considering, is whether we could
make it more flexible for users to apply some stateless processing operators on
the raw key-value pair in byte arrays before deserializing (today we ALWAYS
deserialize first, partially because we need to extract the timestamp), so that
for example in your case you can {{branch}} the stream to two streams for
checkpoint / data only. But this may need to be done as a more comprehensive
story.
As for your case specifically, for now you can still just call
{{Serdes.Long().serializer.serialize()}} in mapValues.
> Provide static serialize() and deserialize() for use as method references
> -------------------------------------------------------------------------
>
> Key: KAFKA-3801
> URL: https://issues.apache.org/jira/browse/KAFKA-3801
> Project: Kafka
> Issue Type: Improvement
> Components: clients, streams
> Reporter: Jeff Klukas
> Assignee: Guozhang Wang
> Priority: Minor
> Fix For: 0.10.1.0
>
>
> While most calls to {{Serializer.serialize}} and {{Deserializer.deserialize}}
> are abstracted away in Kafka Streams through the use of `Serdes` classes,
> there are some instances where developers may want to call them directly. The
> serializers and deserializers for simple types don't require any
> configuration and could be static, but currently it's necessary to create an
> instance to use those methods.
> I'd propose moving serialization logic into a {{static public byte[]
> serialize(? data)}} method and deserialization logic into a {{static public ?
> deserialize(byte[] data)}} method. The existing instance methods would simply
> call the static versions.
> See a full example for LongSerializer and LongDeserializer here:
> https://github.com/apache/kafka/compare/trunk...jklukas:static-serde-methods?expand=1
> In Java 8, these static methods then become available for method references
> in code like {{kstream.mapValues(LongDeserializer::deserialize)}} without the
> user needing to create an instance of {{LongDeserializer}}.
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