Status

Current state:  "Under Discussion"Adopted

Discussion thread: here [Change the link from the KIP proposal email archive to your own email thread]
JIRA:  link

Vote thread: link

JIRA:

• Jira
  server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-12944

   (3.0)

• Jira
  server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-13093

   (3.1)

• Jira
  server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key KAFKA-12872

   (4.0)
  

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

...

On the consumer, it's more complicated. Brokers assume that consumers can read all message format versions and brokers never up-convert records when handling fetch responses. Furthermore, we cannot change the behavior of older broker versions. The options here are a bit complex and require more thought.