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72609b5f69
Generate view updates from a pending base replica if it's a reading replica, i.e. it's in the last stage of transition write_both_read_new before becoming the new base replica. Previously we didn't generate view updates on a pending replica. The problem with that is that when a base token is migrated from one replica B1 to another B2, at one stage we generate view updates only from B1, then at the next stage we generate view updates only from B2. During this transition, it can happen that for some write neither B1 nor B2 generate view update, because each one sees the other as the base replica. We fix this by generating view updates from both base replicas in the phase before the transition. We can generate view updates on the pending replica in this case, even if it requires read-before-write, because it's in a stage where it contains all data and serves reads. Fixes https://github.com/scylladb/scylladb/issues/24292 backport not needed - the issue mostly affects MV with tablets which is still experimental Closes scylladb/scylladb#25904 * github.com:scylladb/scylladb: test: mv: test view update during topology operations mv: generate view updates on both shards in intranode migration mv: generate view updates on pending replica