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Status
Current state: Under Discussion Adopted
Discussion thread: here
JIRA: KAFKA-8455
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Often, when reading an input topic, the key is expected to be null, but there's actually no way to represent this fact in Consumed, leading to confusing type signatures down the topology. For example, you might use the BytesSerde, but then you have a KStream<Bytes,...>. When maintaining a large application, this becomes a hazard, since you'd need to "be really careful" not to try and dereference the key at any point, since you actually know it's always null. One might use the BytesSerde, but then you have a KStream<Bytes,...>. When maintaining a large application, this becomes a hazard, since you'd need to "be really careful" not to try and dereference the key at any point, since you actually know it's always null.
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static public final class VoidSerde extends WrapperSerde<Void> { public VoidSerde() { super(new VoidSerializer(), new VoidDeserializer()); } } public class VoidSerializer implements Serializer<Void> { @Override public byte[] serialize(String topic, Void data) { return new byte[0]; } } public class VoidDeserializer implements Deserializer<Void> { @Override public Void deserialize(String topic, byte[] data) { return null; } }} |
If not null parameters passed then an java.lang.IllegalArgumentException
will be thrown.
Proposed Changes
I want to add VoidSerde
to main SerDe collection Serdes
class.
Compatibility, Deprecation, and Migration Plan
There is are no compatibility issues here.
Rejected Alternatives
One might use the BytesSerde, but then you have a KStream<Bytes,...>. When maintaining a large application, this becomes a hazard, since you'd need to "be really careful" not to try and dereference the key at any point, since you actually know it's always nullNullSerdes
, NothingSerdes
naming was rejected during KIP discussion.