[jira] [Created] (KAFKA-6396) Possibly kafka-connect converter should be able to stop processing chain

["Alexander Koval (JIRA)" <ji...@apache.org>]

Alexander Koval created KAFKA-6396:
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             Summary: Possibly kafka-connect converter should be able to stop processing chain
                 Key: KAFKA-6396
                 URL: https://issues.apache.org/jira/browse/KAFKA-6396
             Project: Kafka
          Issue Type: Wish
          Components: KafkaConnect
    Affects Versions: 1.0.0
            Reporter: Alexander Koval
            Priority: Minor


At present only transformations can discard records returning null. But I think sometimes it would be nice to discard processing chain after converting message. For example I have some tags shipped with a message key and I want to stop processing the message after converting its key (there are a lot of messages and I don't want to deserialize message values that I don't need).

At the moment to do that I should disable converters and move message deserializing to the transformation chain:

{code}
key.converter=org.apache.kafka.connect.converters.ByteArrayConverter
value.converter=org.apache.kafka.connect.converters.ByteArrayConverter

transforms=proto,catalog
transforms.proto.type=company.evo.kafka.ProtobufTransformation
transforms.proto.key.protobuf.class=company.evo.uaprom.indexator.KeyProto$KeyMessage
transforms.proto.value.protobuf.class=company.evo.uaprom.indexator.catalog.CompanyProto$UniversalCompanyMessage
transforms.proto.tag=catalog
{code}

If [WorkerSinkTask|https://github.com/apache/kafka/blob/1.0.0/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L453] checked converted values on {{null}} it would solved my problem more gracefully




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