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157 lines
4.5 KiB
Python
157 lines
4.5 KiB
Python
import json
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import pytest
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from helpers.cluster import ClickHouseCluster
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from random import randint
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cluster = ClickHouseCluster(__file__)
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cluster_name = "parallel_replicas_with_unavailable_nodes"
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nodes = [
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cluster.add_instance(
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f"node{num}", main_configs=["configs/remote_servers.xml"], with_zookeeper=True
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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, table_size, index_granularity):
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for num in range(len(nodes)):
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nodes[num].query(f"DROP TABLE IF EXISTS {table_name}")
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nodes[num].query(
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f"""
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CREATE TABLE IF NOT EXISTS {table_name} (key Int64, value String)
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Engine=ReplicatedMergeTree('/test_parallel_replicas/shard1/{table_name}', '{num}')
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ORDER BY (key)
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SETTINGS index_granularity = {index_granularity}
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"""
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)
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nodes[0].query(
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f"""
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INSERT INTO {table_name}
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SELECT number, toString(number) FROM numbers_mt({table_size})
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"""
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)
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def _create_query(query_tmpl, table_name):
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rand_set = [randint(0, 500) for i in range(42)]
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return query_tmpl.format(table_name=table_name, rand_set=rand_set)
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def _get_result_without_parallel_replicas(query):
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return nodes[0].query(
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query,
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settings={
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"allow_experimental_parallel_reading_from_replicas": 0,
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},
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)
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def _get_result_with_parallel_replicas(
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query, query_id, cluster_name, parallel_replicas_mark_segment_size
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):
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return nodes[0].query(
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query,
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settings={
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"allow_experimental_parallel_reading_from_replicas": 2,
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"max_parallel_replicas": 6,
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"cluster_for_parallel_replicas": f"{cluster_name}",
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"parallel_replicas_mark_segment_size": parallel_replicas_mark_segment_size,
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"query_id": query_id,
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},
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)
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def _get_expected_amount_of_marks_to_read(query):
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return json.loads(
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nodes[0].query(
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f"""
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EXPLAIN ESTIMATE
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{query}
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FORMAT JSONEachRow
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"""
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)
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)["marks"]
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def _get_number_of_marks_read_by_replicas(query_id):
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nodes[0].query("SYSTEM FLUSH LOGS")
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return (
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nodes[0]
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.query(
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f"""
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SELECT sum(
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ProfileEvents['ParallelReplicasReadAssignedMarks']
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+ ProfileEvents['ParallelReplicasReadUnassignedMarks']
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+ ProfileEvents['ParallelReplicasReadAssignedForStealingMarks']
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)
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FROM system.query_log
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WHERE query_id = '{query_id}'
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"""
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)
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.strip()
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)
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@pytest.mark.parametrize(
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"query_tmpl",
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[
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"SELECT sum(cityHash64(*)) FROM {table_name}",
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"SELECT sum(cityHash64(*)) FROM {table_name} WHERE intDiv(key, 100) IN {rand_set}",
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],
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)
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@pytest.mark.parametrize(
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"table_size",
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[1000, 10000, 100000],
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)
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@pytest.mark.parametrize(
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"index_granularity",
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[10, 100],
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)
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@pytest.mark.parametrize(
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"parallel_replicas_mark_segment_size",
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[1, 10],
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)
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def test_number_of_marks_read(
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start_cluster,
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query_tmpl,
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table_size,
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index_granularity,
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parallel_replicas_mark_segment_size,
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):
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if nodes[0].is_built_with_sanitizer():
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pytest.skip("Disabled for sanitizers (too slow)")
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table_name = f"tbl_{len(query_tmpl)}_{cluster_name}_{table_size}_{index_granularity}_{parallel_replicas_mark_segment_size}"
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_create_tables(table_name, table_size, index_granularity)
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if "where" in query_tmpl.lower():
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# We need all the replicas to see the same state of parts to make sure that index analysis will pick the same amount of marks for reading
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# regardless of which replica's state will be chosen as the working set. This should became redundant once we start to always use initiator's snapshot.
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nodes[0].query(f"OPTIMIZE TABLE {table_name} FINAL", settings={"alter_sync": 2})
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for node in nodes:
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node.query(f"SYSTEM SYNC REPLICA {table_name} STRICT")
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query = _create_query(query_tmpl, table_name)
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query_id = f"{table_name}_{randint(0, 1e9)}"
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assert _get_result_with_parallel_replicas(
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query, query_id, cluster_name, parallel_replicas_mark_segment_size
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) == _get_result_without_parallel_replicas(query)
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assert _get_number_of_marks_read_by_replicas(
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query_id
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) == _get_expected_amount_of_marks_to_read(query)
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