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https://github.com/ClickHouse/ClickHouse.git
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125 lines
3.4 KiB
Python
125 lines
3.4 KiB
Python
import functools
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import pytest
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from helpers.cluster import ClickHouseCluster
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from .common import check_on_cluster
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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, "config/config_discovery_path.xml"],
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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 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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# test ON CLUSTER query
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nodes["node0"].query(
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"CREATE TABLE tbl ON CLUSTER 'test_auto_cluster' (x UInt64) ENGINE = MergeTree ORDER BY x"
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)
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nodes["node0"].query("INSERT INTO tbl VALUES (1)")
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nodes["node1"].query("INSERT INTO tbl VALUES (2)")
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assert (
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int(
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nodes["node_observer"]
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.query(
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"SELECT sum(x) FROM clusterAllReplicas(test_auto_cluster, default.tbl)"
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)
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.strip()
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)
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== 3
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)
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# Query SYSTEM DROP DNS CACHE may reload cluster configuration
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# check that it does not affect cluster discovery
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nodes["node1"].query("SYSTEM DROP DNS CACHE")
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nodes["node0"].query("SYSTEM DROP DNS CACHE")
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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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# cleanup
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nodes["node0"].query("DROP TABLE tbl ON CLUSTER 'test_auto_cluster' SYNC")
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