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76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
import re
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from random import randint
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import pytest
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from helpers.cluster import ClickHouseCluster
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cluster = ClickHouseCluster(__file__)
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nodes = [
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cluster.add_instance(
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f"node{num}",
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main_configs=["configs/remote_servers.xml"],
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with_zookeeper=True,
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macros={"replica": f"node{num}", "shard": "shard"},
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)
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for num in range(3)
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]
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@pytest.fixture(scope="module", autouse=True)
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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 _create_tables(table_name):
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nodes[0].query(
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f"DROP TABLE IF EXISTS {table_name} ON CLUSTER 'parallel_replicas'",
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settings={"database_atomic_wait_for_drop_and_detach_synchronously": True},
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)
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# big number of granules + low total size in bytes = super tiny granules = big min_marks_per_task
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# => big mark_segment_size will be chosen. it is not required to be big, just not equal to the default
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nodes[0].query(
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f"""
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CREATE TABLE {table_name} ON CLUSTER 'parallel_replicas' (value Int64)
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Engine=ReplicatedMergeTree('/test_parallel_replicas/shard/{table_name}', '{{replica}}')
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ORDER BY ()
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SETTINGS index_granularity = 1
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"""
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)
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nodes[0].query(f"INSERT INTO {table_name} SELECT 42 FROM numbers(1000)")
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nodes[0].query(f"SYSTEM SYNC REPLICA ON CLUSTER 'parallel_replicas' {table_name}")
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# now mark_segment_size is part of the protocol and is communicated to the initiator.
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# let's check that the correct value is actually used by the coordinator
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def test_mark_segment_size_communicated_correctly(start_cluster):
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table_name = "t"
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_create_tables(table_name)
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for local_plan in [0, 1]:
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query_id = f"query_id_{randint(0, 1000000)}"
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nodes[0].query(
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f"SELECT sum(value) FROM {table_name}",
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settings={
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"allow_experimental_parallel_reading_from_replicas": 2,
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"max_parallel_replicas": 100,
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"cluster_for_parallel_replicas": "parallel_replicas",
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"parallel_replicas_mark_segment_size": 0,
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"parallel_replicas_local_plan": local_plan,
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"query_id": query_id,
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},
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)
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nodes[0].query("SYSTEM FLUSH LOGS")
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log_line = nodes[0].grep_in_log(
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f"{query_id}.*Reading state is fully initialized"
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)
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assert re.search(r"mark_segment_size: (\d+)", log_line).group(1) == "16384"
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