Redis cascading replication

Question

I have cascading replication on redis

A -> B -> C

When I insert data on A, then I can get it on B and C If I insert data into the B, then I cannot receive it on the lower slave C.

The documentation has the following:

Replicas are able to accept connections from other replicas.
Aside from connecting a number of replicas to the same master,
replicas can also be connected to other replicas in a cascading-like
structure. Since Redis 4.0, all the sub-replicas will receive
exactly the same replication stream from the master.

Can I configure replication to write A/B and read from C?

Answer 1

Probably will not be able to configure such replication. read the documentation, found such an item

Also note that since Redis 4.0 replica writes are only local, and are not propagated to sub-replicas attached to the instance. Sub-replicas instead will always receive the replication stream identical to the one sent by the top-level master to the intermediate replicas. So for example in the following setup:

A ---> B ---> C

Even if B is writable, C will not see B writes and will instead have identical dataset as the master instance A.