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Piotr Smaron d4c28690e1 db: fail reads and writes with local consistencty level to a DC with RF=0 
When read or write operations are performed on a DC with RF=0 with LOCAL_QUORUM
or LOCAL_ONE consistency level, Cassandra throws `Unavailable` exception.
Scylla allowed such read operations and failed write operations with a cryptic:
"broken promise" error. This occured because the initial availability
check passed (quorum of 0 requires 0 replicas), but execution failed
later when no replicas existed to process the mutation.

This patch adds an explicit RF=0 validation for LOCAL_ONE and LOCAL_QUORUM that
throws before attempting operation execution.

The change also requires `test_query_dc_with_rf_0_does_not_crash_db` to be
upgraded. This testcase was asserting somewhat similar scenario, but wasn't
taking into account the whole matrix of combinations:
- scenarios: successful vs unsuccesful operation outcome
- local consistency levels: LOCAL_QUORUM & LOCAL_ONE
- operations: SELECT (read) & INSERT (write)

and so it's been extended to cover both the pre-existing and the current issues
and the whole matrix of combinations.

Fixes: scylladb/scylladb#27893
2026-01-22 12:49:45 +01:00
..
auth_cluster
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
dtest
test/cluster/dtest/tools/misc.py: add type annotations to list_to_hashed_dict()
2026-01-13 08:33:17 +02:00
lwt
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
mv
Merge 'topology coordinator: restrict node join/remove to preserve RF-rack validity' from Michael Litvak
2026-01-09 10:01:23 +02:00
object_store
Merge 'Distribute data evenly among primary replicas during restore' from Robert Bindar
2026-01-14 18:57:55 +01:00
random_failures
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
tasks
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
__init__.py
…
conftest.py
test.py: fix the link for the failed_test directory
2026-01-13 10:22:38 +02:00
suite.yaml
test: dtest: reproducer for parallel rebuild failure
2026-01-08 21:55:18 +02:00
test_aggregation.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_alternator_proxy_protocol.py
alternator: add optional listeners for proxy protocol v2
2026-01-13 09:59:24 +02:00
test_alternator.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_automatic_cleanup.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_bad_initial_token.py
test: cluster: add test_bad_initial_token
2025-04-25 12:25:15 +02:00
test_batchlog_manager.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_blocked_bootstrap.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_boot_after_ip_change.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_boot_nodes.py
test: Add test_boot_nodes.py
2025-07-10 10:56:53 +08:00
test_bti_index.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_cdc_generation_clearing.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_cdc_generation_data.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_cdc_generation_publishing.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_cdc_with_alter.py
test: test concurrent writes with column drop with cdc preimage
2025-11-13 17:00:08 +01:00
test_cdc_with_tablets.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_change_ip.py
test.py: add pid to ServerInfo
2025-12-12 15:11:03 +02:00
test_change_replication_factor_1_to_0.py
test: cluster: deflake consistency checks after decommission
2025-09-09 19:01:12 +02:00
test_change_rpc_address.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_client_routes.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_cluster_features.py
test: test_downgrade_after_partial_upgrade: check that feature is disabled on all nodes after partial upgrade
2025-12-30 17:34:56 +01:00
test_commitlog_segment_data_resurrection.py
…
test_commitlog.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_concurrent_schema.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_config_live_updates.py
test: add test for live updates of generic server config
2025-06-23 17:56:26 +02:00
test_config.py
…
test_conflicting_keys_read_repair.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_coordinator_queue_management.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_counter_write_timeout_metric.py
storage_proxy: mark write_timeouts metric for counter write timeouts
2026-01-14 17:50:46 +02:00
test_counters_with_tablets.py
test: add counters with tablets test
2025-11-03 16:04:37 +01:00
test_crash_coordinator_before_streaming.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_create_table_during_node_shutdown.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_data_resurrection_after_cleanup.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_data_resurrection_in_memtable.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_decommission_kill_then_replace.py
topology coordinator: complete pending operation for a replaced node
2026-01-14 13:11:27 +01:00
test_decommission.py
test: cluster: deflake consistency checks after decommission
2025-09-09 19:01:12 +02:00
test_deprecating_cluster_features.py
…
test_describe.py
cql3: Represent create_statement using managed_string
2025-07-01 12:58:02 +02:00
test_different_group0_ids.py
Revert "db/config: don't use RBNO for scaling"
2025-11-18 08:17:17 +02:00
test_encryption.py
test::cluster::test_encryption: Port dtest EAR tests
2025-10-22 14:06:30 +00:00
test_error_becoming_voter.py
…
test_fencing.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_global_ignore_nodes.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_gossip_boot.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_gossiper_empty_self_id_on_shadow_round.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_gossiper_orphan_remover.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_gossiper_race.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_gossiper.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_group0_recovers_after_partial_command_application.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_group0_schema_versioning.py
test: test_group0_schema_versioning: wait for schema sync in system.local
2026-01-14 09:55:45 +01:00
test_hints.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_incremental_repair.py
repair: Fix sstable_list_to_mark_as_repaired with multishard writer
2026-01-08 21:55:18 +02:00
test_initial_token.py
test/cluster/conftest: cluster_con: provide default values for port and use_ssl
2025-08-22 09:51:24 +03:00
test_ip_mappings.py
gossiper: add_saved_endpoint: make generations of excluded nodes negative
2025-12-29 19:13:55 +01:00
test_keyspace_rf.py
test: Generalize tests to work with both numeric RF and rack lists
2025-10-29 23:32:58 +01:00
test_left_node_notification.py
raft topology: Notify that a node was removed only once
2025-12-29 14:22:34 +01:00
test_long_join.py
test: improve async execution in test_long_join
2025-09-08 17:14:37 +02:00
test_long_query_timeout_erm.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_lwt_semaphore.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_maintenance_mode.py
test/cluster/test_maintenance_mode.py: Wait for initialization
2025-11-13 11:07:45 +01:00
test_major_compaction.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_metadata_id.py
test/cluster/conftest: cluster_con: provide default values for port and use_ssl
2025-08-22 09:51:24 +03:00
test_multidc.py
db: fail reads and writes with local consistencty level to a DC with RF=0
2026-01-22 12:49:45 +01:00
test_mutation_schema_change.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_mv.py
tombstone_gc: don't use 'repair' mode for colocated tables
2025-11-25 09:15:46 +01:00
test_no_dc_rack_change.py
test: cluster: introduce test_no_dc_rack_change
2025-04-17 16:22:58 +02:00
test_no_removed_node_event_on_ip_change.py
test.py: add pid to ServerInfo
2025-12-12 15:11:03 +02:00
test_node_isolation.py
topology: let banned node know that it is banned
2025-11-24 17:12:13 +01:00
test_node_ops_metrics.py
test/pylib/rest_client: fix ScyllaMetrics filtering
2025-08-10 10:16:00 +02:00
test_node_shutdown_waits_for_pending_requests.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_nodetool.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_not_enough_token_owners.py
test: cluster: Fix NoHostAvailable error in test_not_enough_token_owners
2026-01-08 21:53:47 +02:00
test_proxy_protocol.py
test: add proxy protocol tests
2025-12-17 14:18:04 +02:00
test_query_rebounce.py
…
test_raft_cluster_features.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_raft_fix_broken_snapshot.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_raft_ignore_nodes.py
…
test_raft_no_quorum.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_raft_recovery_basic.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_raft_recovery_during_join.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_raft_recovery_entry_loss.py
test: unskip test_raft_recovery_entry_loss
2025-10-24 21:23:41 +03:00
test_raft_recovery_majority_loss.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_raft_recovery_stuck.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_raft_recovery_user_data.py
test: assert that majority is lost in some tests of the recovery procedure
2025-10-07 17:48:55 +02:00
test_raft_snapshot_request.py
…
test_raft_snapshot_truncation.py
…
test_raft_voters.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_random_tables.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_read_repair.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_refresh.py
test: refactor test_refresh.py to match test_restore_with_streaming_scopes.
2026-01-13 11:46:48 +02:00
test_remove_alive_node.py
…
test_remove_rpc_client_with_pending_requests.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_repair.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_replace_alive_node.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_replace_ignore_nodes.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_replace_with_encryption.py
…
test_replace_with_same_ip_twice.py
…
test_replace.py
test.py: rework log_browsing for dtest migration
2025-05-19 11:50:55 +00:00
test_replica_exceptions.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_rest_api_on_startup.py
test: add test_rest_api_on_startup
2025-12-03 15:35:59 +01:00
test_restart_cluster.py
…
test_resurrection.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_reversed_queries_during_simulated_upgrade_process.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_rpc_compression.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_select_from_mutation_fragments.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_shutdown_hang.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_size_based_load_balancing.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_snapshot.py
test: add type creation to test_snapshot
2025-07-10 10:46:55 +02:00
test_sstable_cleanup_stop.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_sstable_compression_config.py
test/cluster: Add test for default SSTable compressor
2025-10-30 15:53:54 +02:00
test_sstable_compression_dictionaries_autotrain.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_sstable_compression_dictionaries_basic.py
db/config: Deprecate sstable_compression_dictionaries_allow_in_ddl
2025-10-29 20:13:08 +02:00
test_sstable_compression_dictionaries_upgrade.py
pylib: extract upgrade helpers from test_sstable_compression_dictionaries_upgrade.py
2025-09-15 12:34:45 +02:00
test_sstable_set.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_start_bootstrapped_with_invalid_seed.py
test: disable test_start_bootstrapped_with_invalid_seed
2026-01-15 10:25:45 +01:00
test_streaming_deadlock.py
test: limit test_streaming_deadlock_removenode concurrency
2025-09-19 12:50:20 +03:00
test_table_desc_read_barrier.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_table_drop.py
test: test table drop during flush
2025-04-23 14:29:28 +02:00
test_tablet_repair_scheduler.py
repair: Implement auto repair for tablet repair
2026-01-09 16:11:39 +08:00
test_tablet_stats.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets2.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_colocation.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_cql.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_intranode.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_lwt.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_merge.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_migration.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_tablets_removenode.py
test/cluster: Disable rf_rack_valid_keyspaces in problematic tests
2025-05-10 16:30:49 +02:00
test_tablets.py
Merge 'topology coordinator: restrict node join/remove to preserve RF-rack validity' from Michael Litvak
2026-01-09 10:01:23 +02:00
test_tls.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_tombstone_gc.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_topology_failure_recovery.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_topology_ops_encrypted.py
test: cluster: test_topology_ops[_encrypted]: Fix failures due to background migrations fencing out writes
2026-01-08 21:53:47 +02:00
test_topology_ops_with_rf_rack_valid.py
locator: extend rf-rack validation for rack lists
2025-12-22 09:14:30 +01:00
test_topology_ops.py
test: cluster: test_topology_ops[_encrypted]: Fix failures due to background migrations fencing out writes
2026-01-08 21:53:47 +02:00
test_topology_recovery_basic.py
test.py: apply the nightly label on test_topology_recovery_basic
2025-09-01 14:16:29 +02:00
test_topology_recovery_majority_loss.py
test/cluster/conftest: cluster_con: provide default values for port and use_ssl
2025-08-22 09:51:24 +03:00
test_topology_rejoin.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_topology_remove_decom.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_topology_remove_garbage_group0.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_topology_schema.py
test/pylib: servers_add: add auto_rack_dc parameter
2025-03-30 19:23:40 +03:00
test_topology_smp.py
test/cluster: Adjust simple tests to RF-rack-validity
2025-05-10 16:30:18 +02:00
test_topology_upgrade_not_stuck_after_recent_removal.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_topology_upgrade_stuck.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_topology_upgrade.py
db/config: add tablets_mode_for_new_keyspaces option
2025-03-24 14:54:45 +02:00
test_truncate_concurrent_writes.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_truncate_with_drop.py
system_keyspace: Prune dropped tables from truncation on start/drop
2025-09-03 07:25:34 +03:00
test_truncate_with_tablets.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_unfinished_writes_during_shutdown.py
Merge 'topology coordinator: restrict node join/remove to preserve RF-rack validity' from Michael Litvak
2026-01-09 10:01:23 +02:00
test_vector_store.py
index: allow vector indexes without rf_rack_valid_keyspces
2025-12-05 09:26:26 +02:00
test_view_build_status.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_view_building_coordinator.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_write_query_during_cql_server_shutdown.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_writes_to_previous_cdc_generations.py
test.py: convert skip_mode function to pytest.mark
2026-01-08 21:55:16 +02:00
test_zero_token_nodes_multidc.py
test: cluster: test_zero_token_nodes_multidc: Adjust to rack list RF
2025-10-29 23:32:58 +01:00
test_zero_token_nodes_no_replication.py
test/cluster/conftest: cluster_con: provide default values for port and use_ssl
2025-08-22 09:51:24 +03:00
test_zero_token_nodes_topology_ops.py
test/cluster/test_zero_token_nodes_topology_ops: Adjust to RF-rack-validity
2025-05-10 16:30:34 +02:00
util.py
test: wait for read_barrier in wait_until_driver_service_level_created
2025-11-17 15:21:28 +01:00