test: disable tablets in topology/test_mutation_schema_change.py

This test uses lightweight transactions, which are not enabled
with tablets keyspaces.

test/pylib/random_tables.py

@@ -266,8 +266,13 @@ class RandomTables():
     """A list of managed random tables"""
 
     def __init__(self, test_name: str, manager: ManagerClient, keyspace: str,
-                 replication_factor: int, dc_replication_factor: dict[str, int] = None):
+                 replication_factor: int,
+                 dc_replication_factor: dict[str, int] = None,
+                 enable_tablets: None | bool = None):
         keyspace_query = f"CREATE KEYSPACE IF NOT EXISTS {keyspace} WITH REPLICATION = {{ 'class' : 'NetworkTopologyStrategy', 'replication_factor' : {replication_factor}}}"
+        if enable_tablets is not None:
+            enable_tablets = str(enable_tablets).lower()
+            keyspace_query += f" AND TABLETS = {{'enabled': {enable_tablets} }}"
         self.test_name = test_name
         self.manager = manager
         self.keyspace = keyspace

test/pytest.ini

@@ -8,6 +8,7 @@ markers =
     slow: tests that take more than 30 seconds to run
     replication_factor: replication factor for RandomTables
     without_scylla: run without attaching to a scylla process
+    enable_tablets: create keyspace with tablets enabled or disabled
 norecursedirs = manual perf lib
 # Ignore warnings about HTTPS requests without certificate verification
 # (see issue #15287). Pytest breaks urllib3.disable_warnings() in conftest.py,

test/topology/conftest.py

@@ -230,7 +230,10 @@ def cql(manager):
 async def random_tables(request, manager):
     rf_marker = request.node.get_closest_marker("replication_factor")
     replication_factor = rf_marker.args[0] if rf_marker is not None else 3  # Default 3
-    tables = RandomTables(request.node.name, manager, unique_name(), replication_factor)
+    enable_tablets = request.node.get_closest_marker("enable_tablets")
+    enable_tablets = enable_tablets.args[0] if enable_tablets is not None else None
+    tables = RandomTables(request.node.name, manager, unique_name(),
+                          replication_factor, None, enable_tablets)
     yield tables
 
     # Don't drop tables at the end if we failed or the cluster is dirty - it may be impossible

test/topology/test_mutation_schema_change.py

@@ -20,6 +20,7 @@ logger = logging.getLogger(__name__)
 
 
 @pytest.mark.asyncio
+@pytest.mark.enable_tablets(False)                       # uses lightweight transactions
 async def test_mutation_schema_change(manager, random_tables):
     """
         Cluster A, B, C
@@ -81,6 +82,7 @@ async def test_mutation_schema_change(manager, random_tables):
 
 
 @pytest.mark.asyncio
+@pytest.mark.enable_tablets(False)                       # uses lightweight transactions
 async def test_mutation_schema_change_restart(manager, random_tables):
     """
         Cluster A, B, C