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Test write failures in multi-DC setup
patch by Aleksandr Sorokoumov; reviewed by Andrés de la Peña and Paulo Motta for CASSANDRA-16334
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Gerrrr authored and adelapena committed Oct 26, 2021
1 parent 01cfba2 commit 7c89cade286fa122bf347f9b8660370e57afb5fa
Showing 1 changed file with 47 additions and 0 deletions.
@@ -3,10 +3,12 @@
import logging

from cassandra import ConsistencyLevel, WriteFailure, WriteTimeout
from cassandra.query import SimpleStatement

from dtest import Tester
from thrift_bindings.thrift010 import ttypes as thrift_types
from thrift_test import get_thrift_client
from tools.jmxutils import (JolokiaAgent, make_mbean)

since = pytest.mark.since
logger = logging.getLogger(__name__)
@@ -228,3 +230,48 @@ def test_thrift(self):


def assert_write_failure(session, query, consistency_level):
statement = SimpleStatement(query, consistency_level=consistency_level)
with pytest.raises(WriteFailure):

class TestMultiDCWriteFailures(Tester):
def fixture_add_additional_log_patterns(self, fixture_dtest_setup):
fixture_dtest_setup.ignore_log_patterns = (
"is too large for the maximum size of", # 3.0+
"Encountered an oversized mutation", # 4.0+
"ERROR WRITE_FAILURE", # Logged in DEBUG mode for write failures
"MigrationStage" # This occurs sometimes due to node down (because of restart)

def test_oversized_mutation(self):
Test that multi-DC write failures return operation failed rather than a timeout.
@jira_ticket CASSANDRA-16334.

cluster = self.cluster
cluster.populate([2, 2])
cluster.set_configuration_options(values={'max_mutation_size_in_kb': 128})

node1 = cluster.nodelist()[0]
session = self.patient_exclusive_cql_connection(node1)

session.execute("CREATE KEYSPACE k WITH replication = {'class': 'NetworkTopologyStrategy', 'dc1': 2, 'dc2': 2}")
session.execute("CREATE TABLE k.t (key int PRIMARY KEY, val blob)")

payload = '1' * 1024 * 256
query = "INSERT INTO k.t (key, val) VALUES (1, textAsBlob('{}'))".format(payload)

assert_write_failure(session, query, ConsistencyLevel.LOCAL_ONE)
assert_write_failure(session, query, ConsistencyLevel.ONE)

# verify that no hints are created
with JolokiaAgent(node1) as jmx:
assert 0 == jmx.read_attribute(make_mbean('metrics', type='Storage', name='TotalHints'), 'Count')

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