lucasbru opened a new pull request, #20005:
URL: https://github.com/apache/kafka/pull/20005

   The test is resizing the __consumer_offset topic after broker start. This 
seems to be completely unsupported. The group coordinator fetches the number of 
partitions for the consumer offset topic once and never updates it. So we can 
be in a state where two brokers have a different understanding of how_ 
_consumer_offsets are partitioned.
   
   The result in this test can be that two group coordinators both think they 
own a certain group. The test is resizing __consumer_offsets right after 
start-up from 3 to 50. Before the broker bounce, the GC operates on only three 
partitions (0-2). During the bounce, we get new brokers that operate on (0-49). 
This means that two brokers can both think, at the same time, that they own a 
group.


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