AndrewJSchofield opened a new pull request, #19293:
URL: https://github.com/apache/kafka/pull/19293

   This PR proposes two switches to enable share groups for 4.1 (preview) and 
4.2 (GA).
   
   * `group.version=2` to indicate that the group coordinator is able to 
understand share group records.
   * `share.version=1` to indicate that share groups are enabled. This is used 
as the switch for turning share groups on and off.
   
   In 4.1, the defaults will be `group.version=2` and `share.version=0`. Then a 
user wanting to evaluate the preview of KIP-932 would use 
`bin/kafka-features.sh --bootstrap.server xxxx upgrade --feature 
share.version=1`.
   
   In 4.2, the default will be `share.version=1`. 


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