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Currently in Apache Ignite 3/Gridgain 9, we have an ability to set any number of replicas for any zone regardless of its initial replica number. The problem is that in large clusters, if we create a zone with a number of replicas that would be equal to the cluster size, there will be too many members in each replication group to maintain consensus. This will have a serious impact on performance. Moreover, we don’t have automatic scale up for this case: if the user decides to scale up their cluster, they would need to change the replica number manually (unless it is big enough, exceeding the nodes number).

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