ClickHouse/tests/integration/test_mutation_fetch_fallback/test.py

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import pytest
from helpers.cluster import ClickHouseCluster
cluster = ClickHouseCluster(__file__)
node1 = cluster.add_instance("node1", with_zookeeper=True)
node2 = cluster.add_instance("node2", with_zookeeper=True, stay_alive=True)
@pytest.fixture(scope="module")
def start_cluster():
try:
cluster.start()
for ix, node in enumerate([node1, node2]):
node.query_with_retry(
"""CREATE TABLE fetch_fallback (k int, v int, z String)
ENGINE = ReplicatedMergeTree('/clickhouse/tables/test/t0', '{}')
ORDER BY tuple()""".format(
ix
)
)
yield cluster
finally:
cluster.shutdown()
def test_mutation_fetch_fallback(start_cluster):
node1.query("INSERT INTO fetch_fallback(k, v) VALUES (1, 3), (2, 7), (3, 4)")
node2.stop_clickhouse()
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# Run a mutation using non-deterministic `hostName` function to produce
# different results on replicas and exercise the code responsible for
# discarding local mutation results and fetching "byte-identical" parts
# instead from the replica which first committed the mutation.
node1.query(
"ALTER TABLE fetch_fallback UPDATE z = hostName() WHERE 1 = 1",
settings={"mutations_sync": 1, "allow_nondeterministic_mutations": 1},
)
node2.start_clickhouse()
node1.query("SYSTEM SYNC REPLICA fetch_fallback", timeout=10)
node2.query("SYSTEM SYNC REPLICA fetch_fallback", timeout=10)
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assert node2.contains_in_log(
"We will download merged part from replica to force byte-identical result."
)