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08b29460fc
Currently, a pending replica that applies a write on a table that has materialized views, will build all the view updates as a normal replica, only to realize at a late point, in db::view::get_view_natural_endpoint(), that it doesn't have a paired view replica to send the updates to. It will then either drop the view updates, or send them to a pending view replica, if such exists. This work is unnecessary since it may be dropped, and even if there is a pending view replica to send the updates to, the updates that are built by the pending replica may be wrong since it may have incomplete information. This commit fixes the inefficiency by skipping the view update building step when applying an update on a pending replica. The metric total_view_updates_on_wrong_node is added to count the cases that a view update is determined to be unnecessary. The test reproduces the scenario of writing to a table and applying the update on a pending replica, and verifies that the pending replica doesn't try to build view updates. Fixes scylladb/scylladb#19152 Closes scylladb/scylladb#19488