piotrrzysko commented on pull request #9371:
URL: https://github.com/apache/kafka/pull/9371#issuecomment-704430920


   Thanks for the review, @stanislavkozlovski. If I understand your point 
clearly, you are wondering whether this validation will block changing the 
replication factor for all partitions (replication factor of a topic). Right? 
It will not if all requested reassignments in the batch have the same number of 
target replicas for a given topic. Please take look at the test 
`ReassignPartitionsIntegrationTest::testReassignmentFailOnInconsistentReplicationFactorBetweenPartitions`
 - topic `bar`. It is a simple case because the topic has only one partition, 
but it shows that changing the replication factor from 3 to 4 is possible. 


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