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