Hi All,

First of all apologies if this has been previously discussed I have just joined 
the mail list (I cannot find a JIRA or KIP related nor via good old google 

In our company we are looking to replace some of our more traditional message 
flows with Kafka.

One thing we have found lacking though compared with most messaging systems is 
the ability to set header/metadata separate from our payload. We did think 
about the key, but as this is used for compaction we cannot have changing 
values here which metadata/header values will obviously be.

e.g. these headers/metadata are useful for audit data or platform data that is 
not business payload related e.g. storing
the clientId that generated the message, correlation id of a request/response, 
cluster id where the message was generate (case for MirrorMakers), message uuid 
etc this list is endless.

We would like to propose extending the Record from 
ProducerRecord/ConsumerRecord<K, V> to ProducerRecord/ConsumerRecord<K,V,M> 
where M is metadata/header again being like the key and value a simple byte[] 
so that it is completely upto the end users how to serialize / deserialize it.

What our people’s thoughts?
Any other ideas how to add headers/metadata.

How can I progress this?

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