Thanks for your answer, Indeed, I have already worked on this kind of script. I ended up with 800 lines of groovy script that rebalance partitions across the cluster and minimizing the number of partition moves. I also worked on the partition leadership balancing.
I still have to work on my script because I end up with some unbalanced leaders. The number of partition leaded by one node is on average 17 but I have one node that ends with 12 leads and an other with 21. I am gonna introduce swaps to re equilibrate the leadership. Have you ever worked on this kind of script? I could not find any open-source code on GitHub... Do you have any suggestions? Just in case if you want to have a look I have published my code on GitHub ( https://github.com/Lowess/Kafka/blob/master/com/gumgum/kafka/KafkaManualPartitionRebalancer.groovy ) Thanks
