Config Replication condition checks the config C_i is replicated to a majority of data-bearing voting nodes in C_i in the primary’s term.

Config Replication condition check in reconfig step 1 checks the config terms and version received via heartbeats in memberData. Waiting for _Config Replication in step 4 can either run Config Replication condition check with a ScatterGatherRunner in a loop or let replication coordinator signal it on receiving heartbeat responses.