ClickHouse/tests/integration/test_cluster_discovery/test.py

82 lines
2.4 KiB
Python
Raw Normal View History

2021-11-16 08:38:49 +00:00
import pytest
import functools
2021-11-16 08:38:49 +00:00
import time
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
shard_configs = {
i: f'config/config_shard{i}.xml'
for i in [1, 3]
}
2021-11-16 08:38:49 +00:00
nodes = [
cluster.add_instance(
f'node{i}',
main_configs=[shard_configs.get(i, 'config/config.xml')],
2021-11-16 08:38:49 +00:00
stay_alive=True,
with_zookeeper=True
) for i in range(5)
]
@pytest.fixture(scope="module")
def start_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def check_on_cluster(nodes, expected, *, what, cluster_name='test_auto_cluster', msg=None, retries=5):
2021-11-16 08:38:49 +00:00
"""
Select data from `system.clusters` on specified nodes and check the result
2021-11-16 08:38:49 +00:00
"""
assert 1 <= retries <= 6
2021-11-16 08:38:49 +00:00
for retry in range(1, retries + 1):
nodes_res = {
node.name: int(node.query(f"SELECT {what} FROM system.clusters WHERE cluster = '{cluster_name}'"))
2021-11-16 08:38:49 +00:00
for node in nodes
}
if all(actual == expected for actual in nodes_res.values()):
2021-11-16 08:38:49 +00:00
break
if retry != retries:
time.sleep(2 ** retry)
else:
msg = msg or f"Wrong '{what}' result"
raise Exception(f'{msg}: {nodes_res}, expected: {expected} (after {retries} retries)')
2021-11-16 08:38:49 +00:00
def test_cluster_discovery_startup_and_stop(start_cluster):
"""
Start cluster, check nodes count in system.clusters,
then stop/start some nodes and check that it (dis)appeared in cluster.
"""
check_nodes_count = functools.partial(check_on_cluster, what='count()', msg='Wrong nodes count in cluster')
check_shard_num = functools.partial(check_on_cluster, what='count(DISTINCT shard_num)', msg='Wrong shard_num count in cluster')
total_shards = len(shard_configs) + 1
check_nodes_count([nodes[0], nodes[2]], len(nodes))
check_shard_num([nodes[0], nodes[2]], total_shards)
2021-11-16 08:38:49 +00:00
nodes[1].stop_clickhouse(kill=True)
check_nodes_count([nodes[0], nodes[2]], len(nodes) - 1)
check_shard_num([nodes[0], nodes[2]], total_shards - 1)
2021-11-16 08:38:49 +00:00
nodes[3].stop_clickhouse()
check_nodes_count([nodes[0], nodes[2]], len(nodes) - 2)
2021-11-16 08:38:49 +00:00
nodes[1].start_clickhouse()
check_nodes_count([nodes[0], nodes[2]], len(nodes) - 1)
2021-11-16 08:38:49 +00:00
nodes[3].start_clickhouse()
check_nodes_count([nodes[0], nodes[2]], len(nodes))
check_nodes_count([nodes[1], nodes[2]], 2, cluster_name='two_shards', retries=1)