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In the view update code, the function get_view_natural_endpoint() determines which view replica this base replica should send an update to. It currently gets the *view* table's replication map (i.e., the map from view tokens to lists of replicas holding the token), but assumes that this is also the *base* table's replication map. This assumption was true with vnodes, but is no longer true with tablets - the base table's replication map can be completely different from the view table's. By looking at the wrong mapping, get_view_natural_endpoint() can believe that this node isn't really a base-replica and drop the view update. Alternatively, it can think it is a base replica - but use the wrong base-view pairing and create base-view inconsistencies. This patch solves this bug - get_view_natural_endpoint() now gets two separate replication maps - the base's and the view's. The callers need to remember what the base table was (in some cases they didn't care at the point of the call), and pass it to the function call. This patch also includes a simple test that reproduces the bug, and confirms it is fixed: The test has a 6-node cluster using tablets and a base table with RF=1, and writes one row to it. Before this patch, the code usually gets confused, thinking the base replica isn't a replica and loses the view update. With this patch, the view update works. Fixes #16227. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Closes scylladb/scylladb#16228