[GitHub] [kafka] tombentley commented on pull request #10686: KAFKA-4083: prevent changing replication factor via partition reassignment

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tombentley commented on pull request #10686:
URL: https://github.com/apache/kafka/pull/10686#issuecomment-844838547


   While I agree that all partitions ought to have the same number of replicas, I think this fix is enforcing something different: That you can't change the RF for a partition. While that prevents the partitions getting different RFs from each other if they had the same RF originally it also prevents changing the RF for all the partitions of a topic, which we should support.
   
   There's also the use case where you want to change the RF for a topic, but because it has a large number of partitions you want to do it in batches, using multiple reassignments. I think Cruise Control does this kind of batching, for example. Supporting that requires that, for a time, the topic has partitions with different numbers of replicas.


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