Hi Ismaelj

Thanks, my wiki user is michael.andre.pearce.

Re the link thanks again, actually indeed we started off trying to do this 
after we lost the ability to use the key to hold metadata once the compaction 
feature came, but it actually abusing the payload isn't imo a great solution, 
and has some issues that cannot be overcome and stopping us from using in some 
of our data / message flows. As such I think a solution in the 
broker/message/client needs to be made and formalised. Also then an ecosystems 
of tools could rely on such.

I will add all details in KIP proposal, once I have access.

Cheers
Mike


________________________________________
From: isma...@gmail.com <isma...@gmail.com> on behalf of Ismael Juma 
<ism...@juma.me.uk>
Sent: Sunday, September 18, 2016 9:01:22 AM
To: dev@kafka.apache.org
Subject: Re: ProducerRecord/Consumer MetaData/Headers

Hi Mike,

If you give me your wiki user name, I can give you the required permissions
to post a KIP. This is definitely a big change and there is no clear
consensus if changing the Kafka message format is the right way (it would
be good not to pay the cost if you don't need it) or if it should be done
via schemas, for example. Gwen shared some thoughts in the following
message:

http://search-hadoop.com/m/uyzND1OXS8EoGCU2

Ismael

On Sun, Sep 18, 2016 at 7:11 AM, Michael Pearce <michael.pea...@ig.com>
wrote:

> Hi All, (again)
>
> If it helps the discussion, and almost ready patch implementing this is
> available here:
>
> https://github.com/michaelandrepearce/kafka
>
>
> The biggest/most core change is obviously the kafka.message.Message object.
>
>
>
> Some key bits in this implementation is the server side, and submodules
> (connect, mirrormaker, streams) all updated to be aware of the new “headers”
>
>
>
> As a big API change have to use new feature on the client side, you use
> the ConsumerRecord and ProducerRecord (which now extend the new Enhanced
> versions) for K,V records without any code changes, to use the headers you
> use the Enhanced versions HeadersConsumerRecord and HeadersProducerRecord.
> This was needed to avoid causing code compilation failure just by
> upgrading. If the patch were accepted I would imagine it as a way to
> transition.
>
>
>
> I am guessing this needs a KIP rather than just myself raising a JIRA as
> fairly substantial api change but unsure whom can raise these so assistance
> in the process would be gratefully accepted..
>
>
>
> Cheers
>
> Mike
>
>
>
>
>
>
> From: Michael Pearce <michael.pea...@ig.com>
> Date: Saturday, September 17, 2016 at 6:40 AM
> To: "dev@kafka.apache.org" <dev@kafka.apache.org>
> Subject: ProducerRecord/Consumer MetaData/Headers
>
> 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 search)
>
> 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?
>
> Cheers
> Mike
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