mirror of
https://github.com/ClickHouse/ClickHouse.git
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425 lines
13 KiB
Python
425 lines
13 KiB
Python
import os
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import sys
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import time
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import pytest
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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from helpers.cluster import ClickHouseCluster
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from helpers.test_tools import TSV
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cluster = ClickHouseCluster(__file__)
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NODES = {"node_" + str(i): None for i in (1, 2, 3)}
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NODES["node"] = None
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# Sleep time in milliseconds.
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sleep_time = 30000
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@pytest.fixture(scope="module")
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def started_cluster():
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NODES["node"] = cluster.add_instance(
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"node",
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stay_alive=True,
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main_configs=["configs/remote_servers.xml"],
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user_configs=["configs/users.xml"],
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)
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for name in NODES:
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if name != "node":
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NODES[name] = cluster.add_instance(
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name, user_configs=["configs/users1.xml"]
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)
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try:
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cluster.start()
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for node_id, node in list(NODES.items()):
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node.query(
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"""CREATE TABLE test_hedged (id UInt32, date Date) ENGINE =
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MergeTree() ORDER BY id PARTITION BY toYYYYMM(date)"""
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)
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node.query(
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"INSERT INTO test_hedged select number, toDate(number) from numbers(100);"
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)
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NODES["node"].query(
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"""CREATE TABLE distributed (id UInt32, date Date) ENGINE =
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Distributed('test_cluster', 'default', 'test_hedged')"""
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)
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yield cluster
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finally:
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cluster.shutdown()
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config = """<clickhouse>
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<profiles>
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<default>
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<sleep_in_send_tables_status_ms>{sleep_in_send_tables_status_ms}</sleep_in_send_tables_status_ms>
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<sleep_in_send_data_ms>{sleep_in_send_data_ms}</sleep_in_send_data_ms>
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<sleep_after_receiving_query_ms>{sleep_after_receiving_query_ms}</sleep_after_receiving_query_ms>
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</default>
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</profiles>
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</clickhouse>"""
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def check_query(expected_replica, receive_timeout=300):
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NODES["node"].restart_clickhouse()
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# Without hedged requests select query will last more than 30 seconds,
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# with hedged requests it will last just around 1-2 second
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start = time.time()
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result = NODES["node"].query(
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"SELECT hostName(), id FROM distributed ORDER BY id LIMIT 1 SETTINGS receive_timeout={}".format(
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receive_timeout
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)
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)
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query_time = time.time() - start
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assert TSV(result) == TSV(expected_replica + "\t0")
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print("Query time:", query_time)
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assert query_time < 10
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def check_settings(
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node_name,
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sleep_in_send_tables_status_ms,
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sleep_in_send_data_ms,
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sleep_after_receiving_query_ms,
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):
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attempts = 0
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while attempts < 1000:
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setting1 = NODES[node_name].http_query(
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"SELECT value FROM system.settings WHERE name='sleep_in_send_tables_status_ms'"
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)
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setting2 = NODES[node_name].http_query(
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"SELECT value FROM system.settings WHERE name='sleep_in_send_data_ms'"
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)
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setting3 = NODES[node_name].http_query(
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"SELECT value FROM system.settings WHERE name='sleep_after_receiving_query_ms'"
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)
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if (
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int(setting1) == sleep_in_send_tables_status_ms
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and int(setting2) == sleep_in_send_data_ms
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and int(setting3) == sleep_after_receiving_query_ms
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):
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return
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time.sleep(0.1)
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attempts += 1
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assert attempts < 1000
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def check_changing_replica_events(expected_count):
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result = NODES["node"].query(
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"SELECT value FROM system.events WHERE event='HedgedRequestsChangeReplica'"
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)
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# If server load is high we can see more than expected
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# replica change events, but never less than expected
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assert int(result) >= expected_count
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def check_if_query_sending_was_suspended():
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result = NODES["node"].query(
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"SELECT value FROM system.events WHERE event='SuspendSendingQueryToShard'"
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)
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assert int(result) >= 1
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def check_if_query_sending_was_not_suspended():
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result = NODES["node"].query(
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"SELECT value FROM system.events WHERE event='SuspendSendingQueryToShard'"
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)
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assert result == ""
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def update_configs(
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node_1_sleep_in_send_tables_status=0,
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node_1_sleep_in_send_data=0,
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node_1_sleep_after_receiving_query=0,
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node_2_sleep_in_send_tables_status=0,
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node_2_sleep_in_send_data=0,
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node_2_sleep_after_receiving_query=0,
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node_3_sleep_in_send_tables_status=0,
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node_3_sleep_in_send_data=0,
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node_3_sleep_after_receiving_query=0,
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):
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NODES["node_1"].replace_config(
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"/etc/clickhouse-server/users.d/users1.xml",
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config.format(
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sleep_in_send_tables_status_ms=node_1_sleep_in_send_tables_status,
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sleep_in_send_data_ms=node_1_sleep_in_send_data,
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sleep_after_receiving_query_ms=node_1_sleep_after_receiving_query,
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),
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)
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NODES["node_2"].replace_config(
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"/etc/clickhouse-server/users.d/users1.xml",
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config.format(
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sleep_in_send_tables_status_ms=node_2_sleep_in_send_tables_status,
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sleep_in_send_data_ms=node_2_sleep_in_send_data,
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sleep_after_receiving_query_ms=node_2_sleep_after_receiving_query,
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),
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)
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NODES["node_3"].replace_config(
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"/etc/clickhouse-server/users.d/users1.xml",
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config.format(
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sleep_in_send_tables_status_ms=node_3_sleep_in_send_tables_status,
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sleep_in_send_data_ms=node_3_sleep_in_send_data,
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sleep_after_receiving_query_ms=node_3_sleep_after_receiving_query,
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),
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)
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check_settings(
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"node_1",
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node_1_sleep_in_send_tables_status,
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node_1_sleep_in_send_data,
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node_1_sleep_after_receiving_query,
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)
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check_settings(
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"node_2",
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node_2_sleep_in_send_tables_status,
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node_2_sleep_in_send_data,
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node_2_sleep_after_receiving_query,
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)
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check_settings(
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"node_3",
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node_3_sleep_in_send_tables_status,
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node_3_sleep_in_send_data,
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node_3_sleep_after_receiving_query,
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)
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def test_stuck_replica(started_cluster):
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update_configs()
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cluster.pause_container("node_1")
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check_query(expected_replica="node_2")
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check_changing_replica_events(1)
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result = NODES["node"].query(
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"SELECT slowdowns_count FROM system.clusters WHERE cluster='test_cluster' and host_name='node_1'"
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)
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assert TSV(result) == TSV("1")
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result = NODES["node"].query(
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"SELECT hostName(), id FROM distributed ORDER BY id LIMIT 1"
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)
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assert TSV(result) == TSV("node_2\t0")
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# Check that we didn't choose node_1 first again and slowdowns_count didn't increase.
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result = NODES["node"].query(
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"SELECT slowdowns_count FROM system.clusters WHERE cluster='test_cluster' and host_name='node_1'"
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)
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assert TSV(result) == TSV("1")
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cluster.unpause_container("node_1")
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def test_long_query(started_cluster):
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update_configs()
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# Restart to reset pool states.
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NODES["node"].restart_clickhouse()
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result = NODES["node"].query(
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"select hostName(), max(id + sleep(1.5)) from distributed settings max_block_size = 1, max_threads = 1;"
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)
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assert TSV(result) == TSV("node_1\t99")
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NODES["node"].query(
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"INSERT INTO distributed select number, toDate(number) from numbers(100);"
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)
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def test_send_table_status_sleep(started_cluster):
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update_configs(node_1_sleep_in_send_tables_status=sleep_time)
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check_query(expected_replica="node_2")
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check_changing_replica_events(1)
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def test_send_table_status_sleep2(started_cluster):
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update_configs(
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node_1_sleep_in_send_tables_status=sleep_time,
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node_2_sleep_in_send_tables_status=sleep_time,
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)
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check_query(expected_replica="node_3")
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check_changing_replica_events(2)
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def test_send_data(started_cluster):
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update_configs(node_1_sleep_in_send_data=sleep_time)
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check_query(expected_replica="node_2")
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check_changing_replica_events(1)
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def test_send_data2(started_cluster):
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update_configs(
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node_1_sleep_in_send_data=sleep_time, node_2_sleep_in_send_data=sleep_time
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)
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check_query(expected_replica="node_3")
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check_changing_replica_events(2)
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def test_combination1(started_cluster):
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update_configs(
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node_1_sleep_in_send_tables_status=sleep_time,
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node_2_sleep_in_send_data=sleep_time,
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)
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check_query(expected_replica="node_3")
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check_changing_replica_events(2)
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def test_combination2(started_cluster):
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update_configs(
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node_1_sleep_in_send_data=sleep_time,
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node_2_sleep_in_send_tables_status=sleep_time,
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)
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check_query(expected_replica="node_3")
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check_changing_replica_events(2)
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def test_combination3(started_cluster):
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update_configs(
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node_1_sleep_in_send_data=sleep_time,
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node_2_sleep_in_send_tables_status=1000,
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node_3_sleep_in_send_data=sleep_time,
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)
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check_query(expected_replica="node_2")
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check_changing_replica_events(3)
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def test_combination4(started_cluster):
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update_configs(
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node_1_sleep_in_send_tables_status=1000,
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node_1_sleep_in_send_data=sleep_time,
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node_2_sleep_in_send_tables_status=1000,
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node_3_sleep_in_send_tables_status=1000,
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)
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check_query(expected_replica="node_2")
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check_changing_replica_events(4)
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def test_receive_timeout1(started_cluster):
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# Check the situation when first two replicas get receive timeout
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# in establishing connection, but the third replica is ok.
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update_configs(
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node_1_sleep_in_send_tables_status=3000,
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node_2_sleep_in_send_tables_status=3000,
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node_3_sleep_in_send_data=1000,
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)
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check_query(expected_replica="node_3", receive_timeout=2)
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check_changing_replica_events(2)
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def test_receive_timeout2(started_cluster):
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# Check the situation when first replica get receive timeout
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# in packet receiving but there are replicas in process of
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# connection establishing.
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update_configs(
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node_1_sleep_in_send_data=4000,
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node_2_sleep_in_send_tables_status=2000,
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node_3_sleep_in_send_tables_status=2000,
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)
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check_query(expected_replica="node_2", receive_timeout=3)
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check_changing_replica_events(3)
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def test_initial_receive_timeout(started_cluster):
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# Check the situation when replicas don't respond after
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# receiving query (so, no packets were send to initiator)
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update_configs(
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node_1_sleep_after_receiving_query=20000,
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node_2_sleep_after_receiving_query=20000,
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node_3_sleep_after_receiving_query=20000,
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)
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NODES["node"].restart_clickhouse()
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result = NODES["node"].query_and_get_error(
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"SELECT hostName(), id FROM distributed ORDER BY id LIMIT 1 SETTINGS receive_timeout=3"
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)
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assert "SOCKET_TIMEOUT" in result
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def test_async_connect(started_cluster):
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update_configs()
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NODES["node"].restart_clickhouse()
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NODES["node"].query("DROP TABLE IF EXISTS distributed_connect")
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NODES["node"].query(
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"""CREATE TABLE distributed_connect (id UInt32, date Date) ENGINE =
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Distributed('test_cluster_connect', 'default', 'test_hedged')"""
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)
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NODES["node"].query(
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"SELECT hostName(), id FROM distributed_connect ORDER BY id LIMIT 1 SETTINGS prefer_localhost_replica = 0, connect_timeout_with_failover_ms=5000, async_query_sending_for_remote=0, max_threads=1"
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)
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check_changing_replica_events(2)
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check_if_query_sending_was_not_suspended()
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NODES["node"].query(
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"SELECT hostName(), id FROM distributed_connect ORDER BY id LIMIT 1 SETTINGS prefer_localhost_replica = 0, connect_timeout_with_failover_ms=5000, async_query_sending_for_remote=1, max_threads=1"
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)
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check_changing_replica_events(2)
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check_if_query_sending_was_suspended()
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NODES["node"].query("DROP TABLE distributed_connect")
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def test_async_query_sending(started_cluster):
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update_configs(
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node_1_sleep_after_receiving_query=5000,
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node_2_sleep_after_receiving_query=5000,
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node_3_sleep_after_receiving_query=5000,
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)
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NODES["node"].restart_clickhouse()
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NODES["node"].query("DROP TABLE IF EXISTS distributed_query_sending")
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NODES["node"].query(
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"""CREATE TABLE distributed_query_sending (id UInt32, date Date) ENGINE =
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Distributed('test_cluster_three_shards', 'default', 'test_hedged')"""
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)
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# Create big enough temporary table
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NODES["node"].query("DROP TABLE IF EXISTS tmp")
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NODES["node"].query(
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"CREATE TEMPORARY TABLE tmp (number UInt64, s String) "
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"as select number, randomString(number % 1000) from numbers(10000000)"
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)
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NODES["node"].query(
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"SELECT hostName(), id FROM distributed_query_sending ORDER BY id LIMIT 1 SETTINGS"
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" prefer_localhost_replica = 0, async_query_sending_for_remote=0, max_threads = 1"
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)
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check_if_query_sending_was_not_suspended()
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NODES["node"].query(
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"SELECT hostName(), id FROM distributed_query_sending ORDER BY id LIMIT 1 SETTINGS"
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" prefer_localhost_replica = 0, async_query_sending_for_remote=1, max_threads = 1"
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)
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check_if_query_sending_was_suspended()
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NODES["node"].query("DROP TABLE distributed_query_sending")
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