ClickHouse/tests/integration/test_external_cluster/test.py

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import re
import pytest
from helpers.cluster import ClickHouseCluster
from helpers.test_tools import assert_eq_with_retry
cluster = ClickHouseCluster(__file__)
control_node = cluster.add_instance(
"control_node",
main_configs=["configs/clusters.xml"],
with_zookeeper=True,
)
data_node = cluster.add_instance(
"data_node",
main_configs=["configs/clusters.xml"],
with_zookeeper=True,
macros={"shard": 1, "replica": 1},
)
uuid_regex = re.compile("[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}")
def assert_create_query(node, database_name, table_name, expected):
replace_uuid = lambda x: re.sub(uuid_regex, "uuid", x)
query = "SELECT create_table_query FROM system.tables WHERE database='{}' AND table='{}'".format(
database_name, table_name
)
assert_eq_with_retry(node, query, expected, get_result=replace_uuid)
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def test_ddl(started_cluster):
control_node.query("CREATE DATABASE test_db ON CLUSTER 'external' ENGINE=Atomic")
control_node.query(
"CREATE TABLE test_db.test_table ON CLUSTER 'external' (id Int64) Engine=MergeTree ORDER BY id"
)
control_node.query(
"ALTER TABLE test_db.test_table ON CLUSTER 'external' add column data String"
)
control_node.query("DETACH TABLE test_db.test_table ON CLUSTER 'external'")
expected = ""
assert_create_query(data_node, "test_db", "test_table", expected)
control_node.query("ATTACH TABLE test_db.test_table ON CLUSTER 'external'")
expected = "CREATE TABLE test_db.test_table (`id` Int64, `data` String) ENGINE = MergeTree ORDER BY id SETTINGS index_granularity = 8192"
assert_create_query(data_node, "test_db", "test_table", expected)
control_node.query("DROP TABLE test_db.test_table ON CLUSTER 'external'")
control_node.query("DROP DATABASE test_db ON CLUSTER 'external'")
expected = ""
assert_create_query(data_node, "test_db", "test_table", expected)
def test_ddl_replicated(started_cluster):
control_node.query(
"CREATE DATABASE test_db ON CLUSTER 'external' ENGINE=Replicated('/replicated')",
settings={"allow_experimental_database_replicated": 1},
)
# Exception is expected
assert "It's not initial query" in control_node.query_and_get_error(
"CREATE TABLE test_db.test_table ON CLUSTER 'external' (id Int64) Engine=MergeTree ORDER BY id"
)
control_node.query("DROP DATABASE test_db ON CLUSTER 'external'")