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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

Public Interfaces

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

A public interface is any change to the following:

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Binary log format

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The network protocol and api behavior

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Any class in the public packages under clientsConfiguration, especially client configuration

• org/apache/kafka/common/serialization

• org/apache/kafka/common

• org/apache/kafka/common/errors

• org/apache/kafka/clients/producer

• org/apache/kafka/clients/consumer (eventually, once stable)

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Monitoring

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Command line tools and arguments

3.0 gives us the opportunity to make backwards incompatible changes. With that, now is a good time to change the default serde from `byte array` to `null`. 

Public Interfaces

DEFAULT_KEY_SERDE_CLASS_CONFIG will default to null and DEFAULT_VALUE_SERDE_CLASS_CONFIG will default to null.

// Will return null if no default is set through configs
public Serde defaultKeySerde() {
}

// Will return null if no default is set through configs
 public Serde defaultValueSerde() {
}

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Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.

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