Suppose I have one TiKV cluster deployed in city A and another TiKV cluster deployed in city B. And I want to write data in cluster A and read it in cluster B.
I know that inside cluster A, the data security is enforced by multi-group raft. But how can the data in cluster A be replicated to cluster B and always kept updated? How can inter-cluster replication is performed?
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You can create one of the TiKV cluster between city A and city B, and then use the follower-read feature for this scene.
https://docs.pingcap.com/tidb/stable/follower-read#follower-read
I suggest you deploy one Cluster in city A. And then add one learner replica in city B. Then you can read data in city B directly by follower read.