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On boot several manipulations with system.local are performed. 1. The host_id value is selected from it with key = local If not found, system_keyspace generates a new host_id, inserts the new value into the table and returns back 2. The cluster_name is selected from it with key = local Then it's system_keyspace that either checks that the name matches the one from db::config, or inserts the db::config value into the table 3. The row with key = local is updated with various info like versions, listen, rpc and bcast addresses, dc, rack, etc. Unconditionally All three steps are scattered over main, p.1 is called directly, p.2 and p.3 are executed via system_keyspace::setup() that happens rather late. Also there's some touch of this table from the cql_test_env startup code. The proposal is to collect this setup into one place and execute it early -- as soon as the system.local table is populated. This frees the system_keyspace code from the logic of selecting host id and cluster name leaving it to main and keeps it with only select/insert work. refs: #2795 Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Closes #15082