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563998b69a
Make it so that failures in `removenode`/`decommission` don't lead to reduced availability, and any leftovers in group 0 can be removed by `removenode`: - In `removenode`, make the node a non-voter before removing it from the token ring. This removes the possibility of having a group 0 voting member which doesn't correspond to a token ring member. We can still be left with a non-voter, but that's doesn't reduce the availability of group 0. - As above but for `decommission`. - Make it possible to remove group 0 members that don't correspond to token ring members from group 0 using `removenode`. - Add an API to query the current group 0 configuration. Fixes #11723. Closes #12502 * github.com:scylladb/scylladb: test: test_topology: test for removing garbage group 0 members test/pylib: move some utility functions to util.py db: system_keyspace: add a virtual table with raft configuration db: system_keyspace: improve system.raft_snapshot_config schema service: storage_service: better error handling in `decommission` service: storage_service: fix indentation in removenode service: storage_service: make `removenode` work for group 0 members which are not token ring members service/raft: raft_group0: perform read_barrier in wait_for_raft service: storage_service: make leaving node a non-voter before removing it from group 0 in decommission/removenode test: test_raft_upgrade: remove test_raft_upgrade_with_node_remove service/raft: raft_group0: link to Raft docs where appropriate service/raft: raft_group0: more logging service/raft: raft_group0: separate function for checking and waiting for Raft