ijuma opened a new pull request, #20116:
URL: https://github.com/apache/kafka/pull/20116

   This fixes librdkafka older than the recently released 2.11.0 with Kerberos 
authentication and Apache Kafka 4.x.
   
   Even though this is a bug in librdkafka, a key goal of KIP-896 is not to 
break the popular client libraries listed in it. Adding back JoinGroup v0 & v1 
is a very small change and worth it from that perspective.
   
   The cost of adding JoinGroup v0-v1 back is pretty low and hence I suggest we 
do that.


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