ClickHouse/tests/integration/test_insert_distributed_load_balancing/test.py

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# pylint: disable=unused-argument
# pylint: disable=redefined-outer-name
# pylint: disable=line-too-long
import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
n1 = cluster.add_instance('n1', main_configs=['configs/remote_servers.xml'])
n2 = cluster.add_instance('n2', main_configs=['configs/remote_servers.xml'])
@pytest.fixture(scope='module', autouse=True)
def start_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def create_tables(**dist_settings):
n1.query('DROP TABLE IF EXISTS data')
n2.query('DROP TABLE IF EXISTS data')
n1.query('DROP TABLE IF EXISTS dist')
n1.query('CREATE TABLE data (key Int) Engine=Memory()')
n2.query('CREATE TABLE data (key Int) Engine=Memory()')
n1.query("""
CREATE TABLE dist AS data
Engine=Distributed(
integration_test_cluster,
currentDatabase(),
data,
rand()
)
""", settings=dist_settings)
def insert_data(**settings):
create_tables(**settings)
n1.query('INSERT INTO dist SELECT * FROM numbers(10)', settings=settings)
n1.query('SYSTEM FLUSH DISTRIBUTED dist')
def test_prefer_localhost_replica_1():
insert_data()
assert int(n1.query('SELECT count() FROM data')) == 10
assert int(n2.query('SELECT count() FROM data')) == 0
def test_prefer_localhost_replica_1_load_balancing_in_order():
insert_data(load_balancing='in_order')
assert int(n1.query('SELECT count() FROM data')) == 10
assert int(n2.query('SELECT count() FROM data')) == 0
def test_prefer_localhost_replica_0_load_balancing_nearest_hostname():
insert_data(load_balancing='nearest_hostname', prefer_localhost_replica=0)
assert int(n1.query('SELECT count() FROM data')) == 10
assert int(n2.query('SELECT count() FROM data')) == 0
def test_prefer_localhost_replica_0_load_balancing_in_order():
insert_data(load_balancing='in_order', prefer_localhost_replica=0)
assert int(n1.query('SELECT count() FROM data')) == 0
assert int(n2.query('SELECT count() FROM data')) == 10
def test_prefer_localhost_replica_0_load_balancing_in_order_sync():
insert_data(load_balancing='in_order', prefer_localhost_replica=0, insert_distributed_sync=1)
assert int(n1.query('SELECT count() FROM data')) == 0
assert int(n2.query('SELECT count() FROM data')) == 10