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127 lines
3.5 KiB
Python
127 lines
3.5 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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"node0": "config/config.xml",
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"node1": "config/config_shard1.xml",
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"node2": "config/config.xml",
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"node3": "config/config_shard3.xml",
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"node4": "config/config.xml",
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"node_observer": "config/config_observer.xml",
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}
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nodes = {
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node_name: cluster.add_instance(
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node_name,
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main_configs=[shard_config],
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stay_alive=True,
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with_zookeeper=True,
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)
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for node_name, shard_config in shard_configs.items()
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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(
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nodes, expected, *, what, cluster_name="test_auto_cluster", msg=None, retries=5
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):
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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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node_results = {}
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for retry in range(1, retries + 1):
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for node in nodes:
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if node_results.get(node.name) == expected:
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# do not retry node after success
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continue
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query_text = (
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f"SELECT {what} FROM system.clusters WHERE cluster = '{cluster_name}'"
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)
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node_results[node.name] = int(node.query(query_text))
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if all(actual == expected for actual in node_results.values()):
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break
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print(f"Retry {retry}/{retries} unsuccessful, result: {node_results}")
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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(
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f"{msg}: {node_results}, expected: {expected} (after {retries} retries)"
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)
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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(
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check_on_cluster, what="count()", msg="Wrong nodes count in cluster"
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)
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check_shard_num = functools.partial(
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check_on_cluster,
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what="count(DISTINCT shard_num)",
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msg="Wrong shard_num count in cluster",
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)
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# `- 1` because one node is an observer
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total_shards = len(set(shard_configs.values())) - 1
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total_nodes = len(nodes) - 1
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check_nodes_count(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_nodes
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)
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check_shard_num(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_shards
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)
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nodes["node1"].stop_clickhouse(kill=True)
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check_nodes_count(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_nodes - 1
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)
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# node1 was the only node in shard '1'
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check_shard_num(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_shards - 1
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)
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nodes["node3"].stop_clickhouse()
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check_nodes_count(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_nodes - 2
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)
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nodes["node1"].start_clickhouse()
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check_nodes_count(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_nodes - 1
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)
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nodes["node3"].start_clickhouse()
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check_nodes_count(
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[nodes["node0"], nodes["node2"], nodes["node_observer"]], total_nodes
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)
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# regular cluster is not affected
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check_nodes_count(
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[nodes["node1"], nodes["node2"]], 2, cluster_name="two_shards", retries=1
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)
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