Commits on Feb 4, 2022

1. keys,kvserver: introduce RaftReplicaID …

   The RaftReplicaIDKey is an unreplicated range-id local key that
   contains the ReplicaID of the replica whose HardState is represented
   in the RaftHardStateKey. These two keys are removed atomically when
   we clear the range-id local keys for a replica. See
   store_create_replica.go for a detailed comment on correctness
   and version compatibility.
   
   We currently do not utilize this information on node restart
   to figure out whether we should cleanup stale uninitialized replicas.
   Doing such cleanup can wait until we implement and start using
   ReplicasStorage. The change here is meant to set us up to rely
   on RaftReplicaID from the next release onwards.
   
   Informs cockroachdb#75740
   
   Release note: None

   

   sumeerbhola committed Feb 4, 2022
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