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For the tool to work as intended, GetReplicaLogInfo RPC and designated leadership extension to ElectLeaders RPC are needed. While it is not explicitly specified in KIP-966, designated leadership must have specific safety properties for the tool to operate safely. Designated leader elections should only be allowed if the partition is offline (IE has no leader). A broker may only be designated a leader of a partition if it is in the replica set, is unfenced and has an online replica. This behaviour is consistent with the prerequisites for the existing "unclean" leadership elections. GetReplicaLogInfo requests ask the broker for the length of its replica of a given partition. Note GetReplicaLogInfo in this KIP is slightly different from the one specified in KIP-966.  

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