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https://github.com/ClickHouse/ClickHouse.git
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64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
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import pytest
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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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nodes = [
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cluster.add_instance(
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f'node{i}',
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main_configs=['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_nodes_count_in_cluster(nodes, expected, cluster_name, *, retries):
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"""
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Check nodes count in system.clusters for specified cluster
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"""
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for retry in range(1, retries + 1):
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nodes_cnt = [
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int(node.query(f"SELECT count() 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_cnt):
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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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raise Exception(f'Wrong nodes count in cluster: {nodes_cnt}, 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_in_cluster([nodes[0], nodes[2]], len(nodes), 'test_auto_cluster', retries=1)
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nodes[1].stop_clickhouse(kill=True)
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check_nodes_count_in_cluster([nodes[0], nodes[2]], len(nodes) - 1, 'test_auto_cluster', retries=5)
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nodes[3].stop_clickhouse()
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check_nodes_count_in_cluster([nodes[0], nodes[2]], len(nodes) - 2, 'test_auto_cluster', retries=5)
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nodes[1].start_clickhouse()
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check_nodes_count_in_cluster([nodes[0], nodes[2]], len(nodes) - 1, 'test_auto_cluster', retries=5)
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nodes[3].start_clickhouse()
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check_nodes_count_in_cluster([nodes[0], nodes[2]], len(nodes), 'test_auto_cluster', retries=5)
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