ClickHouse/tests/integration/test_distributed_system_query/test.py

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from contextlib import contextmanager
import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance('node1', main_configs=['configs/remote_servers.xml'])
node2 = cluster.add_instance('node2', main_configs=['configs/remote_servers.xml'])
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
for node in (node1, node2):
node.query('''CREATE TABLE local_table(id UInt32, val String) ENGINE = MergeTree ORDER BY id;''')
node1.query('''CREATE TABLE distributed_table(id UInt32, val String) ENGINE = Distributed(test_cluster, default, local_table, id);''')
yield cluster
finally:
cluster.shutdown()
def test_start_and_stop_replica_send(started_cluster):
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node1.query("SYSTEM STOP DISTRIBUTED SENDS distributed_table;")
node1.query("INSERT INTO distributed_table VALUES (0, 'node1')")
node1.query("INSERT INTO distributed_table VALUES (1, 'node2')")
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# Write only to this node when stop distributed sends
assert node1.query("SELECT COUNT() FROM distributed_table").rstrip() == '1'
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node1.query("SYSTEM START DISTRIBUTED SENDS distributed_table;")
node1.query("SYSTEM FLUSH DISTRIBUTED distributed_table;")
assert node1.query("SELECT COUNT() FROM distributed_table").rstrip() == '2'