[jira] [Created] (KAFKA-19650) Add message key to org.apache.kafka.clients.producer.RecordMetadata

["Schubert Fernandes (Jira)" <ji...@apache.org>]

Schubert Fernandes created KAFKA-19650:
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             Summary: Add message key to org.apache.kafka.clients.producer.RecordMetadata
                 Key: KAFKA-19650
                 URL: https://issues.apache.org/jira/browse/KAFKA-19650
             Project: Kafka
          Issue Type: Wish
          Components: clients
            Reporter: Schubert Fernandes


Although the message key is not really {_}metadata{_}, it may be useful to include it in the _org.apache.kafka.clients.producer.RecordMetadata_ class so that metdata can be tied back to a specific message.
When using a standard Kafka producer it is easy to tie back the metadata to a specific message by using the callback mechanism.
However, when using Kafka streams, the only way to access the metadata and log the details is to register a stream-level _org.apache.kafka.clients.producer.ProducerInterceptor_ instance.
This mechanism has a drawback in that it is impossible to tie the RecordMetadata instance back to a particular message. 
Including the message key in the metadata would solve this problem.



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