nicodds commented on pull request #10207:
URL: https://github.com/apache/kafka/pull/10207#issuecomment-790406227


   > Did you observe this in practice? Wondering, as it seems it should 
actually not be a problem. Can you clarify?
   
   Exactly. I was building a kafka-streams application in wich human-unreadable 
messages in a topic (A) are joined against the data into another topic (B). 
Data in topic B may arrive later than in topic A. Consequently, I personalized 
one of the examples in which `max.task.idle.ms` is used for that purpose. 
Incidentally, I changed the value of `max.poll.interval.ms` to a short value, 
shorter than `max.task.idle.ms`, and I started experiencing frequent 
rebalancing.
   
   I suspect that the idle prevent the tasks from giving a sign of their 
presence, thus they are disconnected from the consumer group.
   
   Let me know if you need any further thing.
   
   All the best,
   Nico


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