void updateTokenFromPeerReplica(FindToken token, String remoteHostName, String remoteReplicaPath) {
    // this already handles newly added peer replica (i.e. move replica)
    Pair<Long, FindToken> pair = new Pair<>(time.milliseconds(), token);
    peerReplicaAndToken.put(remoteHostName + DELIMITER + remoteReplicaPath, pair);
  }
Update peer replica token within this tracker.
@param token the most recent token from peer replica.
@param remoteHostName the hostname of peer node (where the peer replica resides).
@param remoteReplicaPath the path of peer replica on remote peer node.
ambry-store/src/main/java/com/github/ambry/store/RemoteTokenTracker.java