ClickHouse/tests/integration/test_cluster_all_replicas/test.py

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import pytest
from helpers.cluster import ClickHouseCluster
from helpers.client import QueryRuntimeException
cluster = ClickHouseCluster(__file__)
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node1 = cluster.add_instance("node1", main_configs=["configs/remote_servers.xml"])
node2 = cluster.add_instance("node2", main_configs=["configs/remote_servers.xml"])
@pytest.fixture(scope="module")
def start_cluster():
try:
cluster.start()
yield cluster
finally:
cluster.shutdown()
def test_cluster(start_cluster):
assert (
node1.query(
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"SELECT hostName() FROM clusterAllReplicas('one_shard_two_nodes', system.one) ORDER BY ALL"
)
== "node1\nnode2\n"
)
assert set(
node1.query(
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"""SELECT hostName(), * FROM clusterAllReplicas("one_shard_two_nodes", system.one) ORDER BY ALL"""
).splitlines()
) == {"node1\t0", "node2\t0"}
assert (
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node1.query("SELECT hostName() FROM cluster('one_shard_two_nodes', system.one)")
== "node1\n"
)
assert (
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node2.query("SELECT hostName() FROM cluster('one_shard_two_nodes', system.one)")
== "node2\n"
)
def test_global_in(start_cluster):
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node1.query("DROP TABLE IF EXISTS u;")
node1.query("CREATE TABLE u(uid Int16) ENGINE=Memory as select 0")
assert set(
node1.query(
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"""SELECT hostName(), * FROM clusterAllReplicas("one_shard_two_nodes", system.one) where dummy GLOBAL IN u ORDER BY ALL"""
).splitlines()
) == {"node1\t0", "node2\t0"}
@pytest.mark.parametrize(
"cluster",
[
pytest.param("one_shard_three_nodes"),
pytest.param("two_shards_three_nodes"),
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],
)
def test_skip_unavailable_replica(start_cluster, cluster):
assert (
node1.query(
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f"SELECT hostName() FROM clusterAllReplicas('{cluster}', system.one) ORDER BY ALL settings skip_unavailable_shards=1"
)
== "node1\nnode2\n"
)
@pytest.mark.parametrize(
"cluster",
[
pytest.param("one_shard_three_nodes"),
pytest.param("two_shards_three_nodes"),
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],
)
def test_error_on_unavailable_replica(start_cluster, cluster):
# clusterAllReplicas() consider each replica as shard
# so when skip_unavailable_shards=0 - any unavailable replica should lead to an error
with pytest.raises(QueryRuntimeException):
node1.query(
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f"SELECT hostName() FROM clusterAllReplicas('{cluster}', system.one) ORDER BY ALL settings skip_unavailable_shards=0"
)