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ClickHouse/tests/integration/test_postgresql_replica_database_engine/test.py
kssenii e42a687b80 Fix
2021-10-08 23:52:15 +03:00

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import pytest
import time
import psycopg2
import os.path as p
import random
from helpers.cluster import ClickHouseCluster
from helpers.test_tools import assert_eq_with_retry
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT
from helpers.test_tools import TSV
from random import randrange
import threading
cluster = ClickHouseCluster(__file__)
instance = cluster.add_instance('instance',
main_configs = ['configs/log_conf.xml'],
user_configs = ['configs/users.xml'],
with_postgres=True, stay_alive=True)
postgres_table_template = """
CREATE TABLE IF NOT EXISTS "{}" (
key Integer NOT NULL, value Integer, PRIMARY KEY(key))
"""
postgres_table_template_2 = """
CREATE TABLE IF NOT EXISTS "{}" (
key Integer NOT NULL, value1 Integer, value2 Integer, value3 Integer, PRIMARY KEY(key))
"""
postgres_table_template_3 = """
CREATE TABLE IF NOT EXISTS "{}" (
key1 Integer NOT NULL, value1 Integer, key2 Integer NOT NULL, value2 Integer NOT NULL)
"""
def get_postgres_conn(ip, port, database=False, auto_commit=True, database_name='postgres_database', replication=False):
if database == True:
conn_string = "host={} port={} dbname='{}' user='postgres' password='mysecretpassword'".format(ip, port, database_name)
else:
conn_string = "host={} port={} user='postgres' password='mysecretpassword'".format(ip, port)
if replication:
conn_string += " replication='database'"
conn = psycopg2.connect(conn_string)
if auto_commit:
conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
conn.autocommit = True
return conn
def create_replication_slot(conn, slot_name='user_slot'):
cursor = conn.cursor()
cursor.execute('CREATE_REPLICATION_SLOT {} LOGICAL pgoutput EXPORT_SNAPSHOT'.format(slot_name))
result = cursor.fetchall()
print(result[0][0]) # slot name
print(result[0][1]) # start lsn
print(result[0][2]) # snapshot
return result[0][2]
def drop_replication_slot(conn, slot_name='user_slot'):
cursor = conn.cursor()
cursor.execute("select pg_drop_replication_slot('{}')".format(slot_name))
def create_postgres_db(cursor, name='postgres_database'):
cursor.execute("CREATE DATABASE {}".format(name))
def drop_postgres_db(cursor, name='postgres_database'):
cursor.execute("DROP DATABASE IF EXISTS {}".format(name))
def create_clickhouse_postgres_db(ip, port, name='postgres_database'):
instance.query('''
CREATE DATABASE {}
ENGINE = PostgreSQL('{}:{}', '{}', 'postgres', 'mysecretpassword')'''.format(name, ip, port, name))
def drop_clickhouse_postgres_db(name='postgres_database'):
instance.query('DROP DATABASE {}'.format(name))
def create_materialized_db(ip, port,
materialized_database='test_database',
postgres_database='postgres_database',
settings=[]):
instance.query(f"DROP DATABASE IF EXISTS {materialized_database}")
create_query = f"CREATE DATABASE {materialized_database} ENGINE = MaterializedPostgreSQL('{ip}:{port}', '{postgres_database}', 'postgres', 'mysecretpassword')"
if len(settings) > 0:
create_query += " SETTINGS "
for i in range(len(settings)):
if i != 0:
create_query += ', '
create_query += settings[i]
instance.query(create_query)
assert materialized_database in instance.query('SHOW DATABASES')
def drop_materialized_db(materialized_database='test_database'):
instance.query('DROP DATABASE IF EXISTS {}'.format(materialized_database))
assert materialized_database not in instance.query('SHOW DATABASES')
def drop_postgres_table(cursor, table_name):
cursor.execute("""DROP TABLE IF EXISTS "{}" """.format(table_name))
def create_postgres_table(cursor, table_name, replica_identity_full=False, template=postgres_table_template):
drop_postgres_table(cursor, table_name)
cursor.execute(template.format(table_name))
if replica_identity_full:
cursor.execute('ALTER TABLE {} REPLICA IDENTITY FULL;'.format(table_name))
queries = [
'INSERT INTO postgresql_replica_{} select i, i from generate_series(0, 10000) as t(i);',
'DELETE FROM postgresql_replica_{} WHERE (value*value) % 3 = 0;',
'UPDATE postgresql_replica_{} SET value = value - 125 WHERE key % 2 = 0;',
"UPDATE postgresql_replica_{} SET key=key+20000 WHERE key%2=0",
'INSERT INTO postgresql_replica_{} select i, i from generate_series(40000, 50000) as t(i);',
'DELETE FROM postgresql_replica_{} WHERE key % 10 = 0;',
'UPDATE postgresql_replica_{} SET value = value + 101 WHERE key % 2 = 1;',
"UPDATE postgresql_replica_{} SET key=key+80000 WHERE key%2=1",
'DELETE FROM postgresql_replica_{} WHERE value % 2 = 0;',
'UPDATE postgresql_replica_{} SET value = value + 2000 WHERE key % 5 = 0;',
'INSERT INTO postgresql_replica_{} select i, i from generate_series(200000, 250000) as t(i);',
'DELETE FROM postgresql_replica_{} WHERE value % 3 = 0;',
'UPDATE postgresql_replica_{} SET value = value * 2 WHERE key % 3 = 0;',
"UPDATE postgresql_replica_{} SET key=key+500000 WHERE key%2=1",
'INSERT INTO postgresql_replica_{} select i, i from generate_series(1000000, 1050000) as t(i);',
'DELETE FROM postgresql_replica_{} WHERE value % 9 = 2;',
"UPDATE postgresql_replica_{} SET key=key+10000000",
'UPDATE postgresql_replica_{} SET value = value + 2 WHERE key % 3 = 1;',
'DELETE FROM postgresql_replica_{} WHERE value%5 = 0;'
]
def assert_nested_table_is_created(table_name, materialized_database='test_database'):
database_tables = instance.query('SHOW TABLES FROM {}'.format(materialized_database))
while table_name not in database_tables:
time.sleep(0.2)
database_tables = instance.query('SHOW TABLES FROM {}'.format(materialized_database))
assert(table_name in database_tables)
@pytest.mark.timeout(320)
def assert_number_of_columns(expected, table_name, database_name='test_database'):
result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")
while (int(result) != expected):
time.sleep(1)
result = instance.query(f"select count() from system.columns where table = '{table_name}' and database = '{database_name}' and not startsWith(name, '_')")
@pytest.mark.timeout(320)
def check_tables_are_synchronized(table_name, order_by='key', postgres_database='postgres_database', materialized_database='test_database'):
assert_nested_table_is_created(table_name, materialized_database)
expected = instance.query('select * from {}.{} order by {};'.format(postgres_database, table_name, order_by))
result = instance.query('select * from {}.{} order by {};'.format(materialized_database, table_name, order_by))
while result != expected:
time.sleep(0.5)
result = instance.query('select * from {}.{} order by {};'.format(materialized_database, table_name, order_by))
assert(result == expected)
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
conn = get_postgres_conn(ip=cluster.postgres_ip, port=cluster.postgres_port)
cursor = conn.cursor()
create_postgres_db(cursor, 'postgres_database')
create_clickhouse_postgres_db(ip=cluster.postgres_ip, port=cluster.postgres_port)
instance.query("DROP DATABASE IF EXISTS test_database")
yield cluster
finally:
cluster.shutdown()
def test_load_and_sync_all_database_tables(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
create_postgres_table(cursor, table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(50)".format(table_name))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
assert 'test_database' in instance.query('SHOW DATABASES')
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
cursor.execute('drop table {};'.format(table_name))
result = instance.query('''SELECT count() FROM system.tables WHERE database = 'test_database';''')
assert(int(result) == NUM_TABLES)
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_replicating_dml(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(50)".format(i, i))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for i in range(NUM_TABLES):
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 50 + number, {} from numbers(1000)".format(i, i))
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
for i in range(NUM_TABLES):
cursor.execute('UPDATE postgresql_replica_{} SET value = {} * {} WHERE key < 50;'.format(i, i, i))
cursor.execute('UPDATE postgresql_replica_{} SET value = {} * {} * {} WHERE key >= 50;'.format(i, i, i, i))
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
cursor.execute('DELETE FROM postgresql_replica_{} WHERE (value*value + {}) % 2 = 0;'.format(i, i))
cursor.execute('UPDATE postgresql_replica_{} SET value = value - (value % 7) WHERE key > 128 AND key < 512;'.format(i))
cursor.execute('DELETE FROM postgresql_replica_{} WHERE key % 7 = 1;'.format(i, i))
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
drop_materialized_db()
def test_different_data_types(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
cursor.execute('drop table if exists test_data_types;')
cursor.execute('drop table if exists test_array_data_type;')
cursor.execute(
'''CREATE TABLE test_data_types (
id integer PRIMARY KEY, a smallint, b integer, c bigint, d real, e double precision, f serial, g bigserial,
h timestamp, i date, j decimal(5, 5), k numeric(5, 5))''')
cursor.execute(
'''CREATE TABLE test_array_data_type
(
key Integer NOT NULL PRIMARY KEY,
a Date[] NOT NULL, -- Date
b Timestamp[] NOT NULL, -- DateTime64(6)
c real[][] NOT NULL, -- Float32
d double precision[][] NOT NULL, -- Float64
e decimal(5, 5)[][][] NOT NULL, -- Decimal32
f integer[][][] NOT NULL, -- Int32
g Text[][][][][] NOT NULL, -- String
h Integer[][][], -- Nullable(Int32)
i Char(2)[][][][], -- Nullable(String)
k Char(2)[] -- Nullable(String)
)''')
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for i in range(10):
instance.query('''
INSERT INTO postgres_database.test_data_types VALUES
({}, -32768, -2147483648, -9223372036854775808, 1.12345, 1.1234567890, 2147483647, 9223372036854775807, '2000-05-12 12:12:12.012345', '2000-05-12', 0.2, 0.2)'''.format(i))
check_tables_are_synchronized('test_data_types', 'id');
result = instance.query('SELECT * FROM test_database.test_data_types ORDER BY id LIMIT 1;')
assert(result == '0\t-32768\t-2147483648\t-9223372036854775808\t1.12345\t1.123456789\t2147483647\t9223372036854775807\t2000-05-12 12:12:12.012345\t2000-05-12\t0.2\t0.2\n')
for i in range(10):
col = random.choice(['a', 'b', 'c'])
cursor.execute('UPDATE test_data_types SET {} = {};'.format(col, i))
cursor.execute('''UPDATE test_data_types SET i = '2020-12-12';'''.format(col, i))
check_tables_are_synchronized('test_data_types', 'id');
instance.query("INSERT INTO postgres_database.test_array_data_type "
"VALUES ("
"0, "
"['2000-05-12', '2000-05-12'], "
"['2000-05-12 12:12:12.012345', '2000-05-12 12:12:12.012345'], "
"[[1.12345], [1.12345], [1.12345]], "
"[[1.1234567891], [1.1234567891], [1.1234567891]], "
"[[[0.11111, 0.11111]], [[0.22222, 0.22222]], [[0.33333, 0.33333]]], "
"[[[1, 1], [1, 1]], [[3, 3], [3, 3]], [[4, 4], [5, 5]]], "
"[[[[['winx', 'winx', 'winx']]]]], "
"[[[1, NULL], [NULL, 1]], [[NULL, NULL], [NULL, NULL]], [[4, 4], [5, 5]]], "
"[[[[NULL]]]], "
"[]"
")")
expected = (
"0\t" +
"['2000-05-12','2000-05-12']\t" +
"['2000-05-12 12:12:12.012345','2000-05-12 12:12:12.012345']\t" +
"[[1.12345],[1.12345],[1.12345]]\t" +
"[[1.1234567891],[1.1234567891],[1.1234567891]]\t" +
"[[[0.11111,0.11111]],[[0.22222,0.22222]],[[0.33333,0.33333]]]\t"
"[[[1,1],[1,1]],[[3,3],[3,3]],[[4,4],[5,5]]]\t"
"[[[[['winx','winx','winx']]]]]\t"
"[[[1,NULL],[NULL,1]],[[NULL,NULL],[NULL,NULL]],[[4,4],[5,5]]]\t"
"[[[[NULL]]]]\t"
"[]\n"
)
check_tables_are_synchronized('test_array_data_type');
result = instance.query('SELECT * FROM test_database.test_array_data_type ORDER BY key;')
assert(result == expected)
drop_materialized_db()
cursor.execute('drop table if exists test_data_types;')
cursor.execute('drop table if exists test_array_data_type;')
def test_load_and_sync_subset_of_database_tables(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 10
publication_tables = ''
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, number from numbers(50)".format(i))
if i < int(NUM_TABLES/2):
if publication_tables != '':
publication_tables += ', '
publication_tables += table_name
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
settings=["materialized_postgresql_tables_list = '{}'".format(publication_tables)])
assert 'test_database' in instance.query('SHOW DATABASES')
time.sleep(1)
for i in range(int(NUM_TABLES/2)):
table_name = 'postgresql_replica_{}'.format(i)
assert_nested_table_is_created(table_name)
result = instance.query('''SELECT count() FROM system.tables WHERE database = 'test_database';''')
assert(int(result) == int(NUM_TABLES/2))
database_tables = instance.query('SHOW TABLES FROM test_database')
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
if i < int(NUM_TABLES/2):
assert table_name in database_tables
else:
assert table_name not in database_tables
instance.query("INSERT INTO postgres_database.{} SELECT 50 + number, {} from numbers(100)".format(table_name, i))
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
if i < int(NUM_TABLES/2):
check_tables_are_synchronized(table_name);
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_changing_replica_identity_value(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
create_postgres_table(cursor, 'postgresql_replica');
instance.query("INSERT INTO postgres_database.postgresql_replica SELECT 50 + number, number from numbers(50)")
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
instance.query("INSERT INTO postgres_database.postgresql_replica SELECT 100 + number, number from numbers(50)")
check_tables_are_synchronized('postgresql_replica');
cursor.execute("UPDATE postgresql_replica SET key=key-25 WHERE key<100 ")
check_tables_are_synchronized('postgresql_replica');
drop_materialized_db()
cursor.execute('drop table if exists postgresql_replica;')
def test_clickhouse_restart(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(50)".format(i, i))
instance.query("CREATE DATABASE test_database ENGINE = MaterializedPostgreSQL('postgres1:5432', 'postgres_database', 'postgres', 'mysecretpassword')")
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
for i in range(NUM_TABLES):
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 50 + number, {} from numbers(50000)".format(i, i))
instance.restart_clickhouse()
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_replica_identity_index(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
create_postgres_table(cursor, 'postgresql_replica', template=postgres_table_template_3);
cursor.execute("CREATE unique INDEX idx on postgresql_replica(key1, key2);")
cursor.execute("ALTER TABLE postgresql_replica REPLICA IDENTITY USING INDEX idx")
instance.query("INSERT INTO postgres_database.postgresql_replica SELECT number, number, number, number from numbers(50, 10)")
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
instance.query("INSERT INTO postgres_database.postgresql_replica SELECT number, number, number, number from numbers(100, 10)")
check_tables_are_synchronized('postgresql_replica', order_by='key1');
cursor.execute("UPDATE postgresql_replica SET key1=key1-25 WHERE key1<100 ")
cursor.execute("UPDATE postgresql_replica SET key2=key2-25 WHERE key2>100 ")
cursor.execute("UPDATE postgresql_replica SET value1=value1+100 WHERE key1<100 ")
cursor.execute("UPDATE postgresql_replica SET value2=value2+200 WHERE key2>100 ")
check_tables_are_synchronized('postgresql_replica', order_by='key1');
cursor.execute('DELETE FROM postgresql_replica WHERE key2<75;')
check_tables_are_synchronized('postgresql_replica', order_by='key1');
drop_materialized_db()
cursor.execute('drop table if exists postgresql_replica;')
def test_table_schema_changes(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i), template=postgres_table_template_2);
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {}, {}, {} from numbers(25)".format(i, i, i, i))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
settings=["materialized_postgresql_allow_automatic_update = 1"])
for i in range(NUM_TABLES):
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 25 + number, {}, {}, {} from numbers(25)".format(i, i, i, i))
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
expected = instance.query("SELECT key, value1, value3 FROM test_database.postgresql_replica_3 ORDER BY key");
altered_idx = random.randint(0, 4)
altered_table = f'postgresql_replica_{altered_idx}'
cursor.execute(f"ALTER TABLE {altered_table} DROP COLUMN value2")
for i in range(NUM_TABLES):
cursor.execute(f"INSERT INTO postgresql_replica_{i} VALUES (50, {i}, {i})")
cursor.execute(f"UPDATE {altered_table} SET value3 = 12 WHERE key%2=0")
time.sleep(2)
assert_nested_table_is_created(altered_table)
assert_number_of_columns(3, altered_table)
check_tables_are_synchronized(altered_table)
print('check1 OK')
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
if i != altered_idx:
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 51 + number, {}, {}, {} from numbers(49)".format(i, i, i, i))
else:
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT 51 + number, {}, {} from numbers(49)".format(i, i, i))
check_tables_are_synchronized(altered_table);
print('check2 OK')
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
cursor.execute('drop table postgresql_replica_{};'.format(i))
instance.query("DROP DATABASE test_database")
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_many_concurrent_queries(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT number, number from numbers(10000)'.format(i))
n = [10000]
query_pool = ['DELETE FROM postgresql_replica_{} WHERE (value*value) % 3 = 0;',
'UPDATE postgresql_replica_{} SET value = value - 125 WHERE key % 2 = 0;',
'DELETE FROM postgresql_replica_{} WHERE key % 10 = 0;',
'UPDATE postgresql_replica_{} SET value = value*5 WHERE key % 2 = 1;',
'DELETE FROM postgresql_replica_{} WHERE value % 2 = 0;',
'UPDATE postgresql_replica_{} SET value = value + 2000 WHERE key % 5 = 0;',
'DELETE FROM postgresql_replica_{} WHERE value % 3 = 0;',
'UPDATE postgresql_replica_{} SET value = value * 2 WHERE key % 3 = 0;',
'DELETE FROM postgresql_replica_{} WHERE value % 9 = 2;',
'UPDATE postgresql_replica_{} SET value = value + 2 WHERE key % 3 = 1;',
'DELETE FROM postgresql_replica_{} WHERE value%5 = 0;']
def attack(thread_id):
print('thread {}'.format(thread_id))
k = 10000
for i in range(20):
query_id = random.randrange(0, len(query_pool)-1)
table_id = random.randrange(0, 5) # num tables
# random update / delete query
cursor.execute(query_pool[query_id].format(table_id))
print("table {} query {} ok".format(table_id, query_id))
# allow some thread to do inserts (not to violate key constraints)
if thread_id < 5:
print("try insert table {}".format(thread_id))
instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT {}*10000*({} + number), number from numbers(1000)'.format(i, thread_id, k))
k += 1
print("insert table {} ok".format(thread_id))
if i == 5:
# also change primary key value
print("try update primary key {}".format(thread_id))
cursor.execute("UPDATE postgresql_replica_{} SET key=key%100000+100000*{} WHERE key%{}=0".format(thread_id, i+1, i+1))
print("update primary key {} ok".format(thread_id))
threads = []
threads_num = 16
for i in range(threads_num):
threads.append(threading.Thread(target=attack, args=(i,)))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for thread in threads:
time.sleep(random.uniform(0, 1))
thread.start()
n[0] = 50000
for table_id in range(NUM_TABLES):
n[0] += 1
instance.query('INSERT INTO postgres_database.postgresql_replica_{} SELECT {} + number, number from numbers(5000)'.format(table_id, n[0]))
#cursor.execute("UPDATE postgresql_replica_{} SET key=key%100000+100000*{} WHERE key%{}=0".format(table_id, table_id+1, table_id+1))
for thread in threads:
thread.join()
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
count1 = instance.query('SELECT count() FROM postgres_database.postgresql_replica_{}'.format(i))
count2 = instance.query('SELECT count() FROM (SELECT * FROM test_database.postgresql_replica_{})'.format(i))
assert(int(count1) == int(count2))
print(count1, count2)
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_single_transaction(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=False)
cursor = conn.cursor()
create_postgres_table(cursor, 'postgresql_replica_0');
conn.commit()
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
assert_nested_table_is_created('postgresql_replica_0')
for query in queries:
print('query {}'.format(query))
cursor.execute(query.format(0))
time.sleep(5)
result = instance.query("select count() from test_database.postgresql_replica_0")
# no commit yet
assert(int(result) == 0)
conn.commit()
check_tables_are_synchronized('postgresql_replica_0');
drop_materialized_db()
cursor.execute('drop table if exists postgresql_replica_0;')
def test_virtual_columns(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
create_postgres_table(cursor, 'postgresql_replica_0');
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
settings=["materialized_postgresql_allow_automatic_update = 1"])
assert_nested_table_is_created('postgresql_replica_0')
instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number from numbers(10)")
check_tables_are_synchronized('postgresql_replica_0');
# just check that it works, no check with `expected` because _version is taken as LSN, which will be different each time.
result = instance.query('SELECT key, value, _sign, _version FROM test_database.postgresql_replica_0;')
print(result)
cursor.execute("ALTER TABLE postgresql_replica_0 ADD COLUMN value2 integer")
instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number, number from numbers(10, 10)")
assert_number_of_columns(3, 'postgresql_replica_0')
check_tables_are_synchronized('postgresql_replica_0');
result = instance.query('SELECT key, value, value2, _sign, _version FROM test_database.postgresql_replica_0;')
print(result)
instance.query("INSERT INTO postgres_database.postgresql_replica_0 SELECT number, number, number from numbers(20, 10)")
check_tables_are_synchronized('postgresql_replica_0');
result = instance.query('SELECT key, value, value2, _sign, _version FROM test_database.postgresql_replica_0;')
print(result)
drop_materialized_db()
cursor.execute('drop table if exists postgresql_replica_0;')
def test_multiple_databases(started_cluster):
drop_materialized_db('test_database_1')
drop_materialized_db('test_database_2')
NUM_TABLES = 5
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=False)
cursor = conn.cursor()
create_postgres_db(cursor, 'postgres_database_1')
create_postgres_db(cursor, 'postgres_database_2')
conn1 = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, database_name='postgres_database_1')
conn2 = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, database_name='postgres_database_2')
cursor1 = conn1.cursor()
cursor2 = conn2.cursor()
create_clickhouse_postgres_db(cluster.postgres_ip, cluster.postgres_port, 'postgres_database_1')
create_clickhouse_postgres_db(cluster.postgres_ip, cluster.postgres_port, 'postgres_database_2')
cursors = [cursor1, cursor2]
for cursor_id in range(len(cursors)):
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
create_postgres_table(cursors[cursor_id], table_name);
instance.query("INSERT INTO postgres_database_{}.{} SELECT number, number from numbers(50)".format(cursor_id + 1, table_name))
print('database 1 tables: ', instance.query('''SELECT name FROM system.tables WHERE database = 'postgres_database_1';'''))
print('database 2 tables: ', instance.query('''SELECT name FROM system.tables WHERE database = 'postgres_database_2';'''))
create_materialized_db(started_cluster.postgres_ip, started_cluster.postgres_port,
'test_database_1', 'postgres_database_1')
create_materialized_db(started_cluster.postgres_ip, started_cluster.postgres_port,
'test_database_2', 'postgres_database_2')
cursors = [cursor1, cursor2]
for cursor_id in range(len(cursors)):
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
instance.query("INSERT INTO postgres_database_{}.{} SELECT 50 + number, number from numbers(50)".format(cursor_id + 1, table_name))
for cursor_id in range(len(cursors)):
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(
table_name, 'key', 'postgres_database_{}'.format(cursor_id + 1), 'test_database_{}'.format(cursor_id + 1));
for i in range(NUM_TABLES):
cursor1.execute('drop table if exists postgresql_replica_{};'.format(i))
for i in range(NUM_TABLES):
cursor2.execute('drop table if exists postgresql_replica_{};'.format(i))
drop_clickhouse_postgres_db('postgres_database_1')
drop_clickhouse_postgres_db('postgres_database_2')
drop_materialized_db('test_database_1')
drop_materialized_db('test_database_2')
def test_concurrent_transactions(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 6
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
def transaction(thread_id):
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=False)
cursor_ = conn.cursor()
for query in queries:
cursor_.execute(query.format(thread_id))
print('thread {}, query {}'.format(thread_id, query))
conn.commit()
threads = []
threads_num = 6
for i in range(threads_num):
threads.append(threading.Thread(target=transaction, args=(i,)))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for thread in threads:
time.sleep(random.uniform(0, 0.5))
thread.start()
for thread in threads:
thread.join()
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
count1 = instance.query('SELECT count() FROM postgres_database.postgresql_replica_{}'.format(i))
count2 = instance.query('SELECT count() FROM (SELECT * FROM test_database.postgresql_replica_{})'.format(i))
print(int(count1), int(count2), sep=' ')
assert(int(count1) == int(count2))
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_abrupt_connection_loss_while_heavy_replication(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 6
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
def transaction(thread_id):
if thread_id % 2:
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=True)
else:
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=False)
cursor_ = conn.cursor()
for query in queries:
cursor_.execute(query.format(thread_id))
print('thread {}, query {}'.format(thread_id, query))
if thread_id % 2 == 0:
conn.commit()
threads = []
threads_num = 6
for i in range(threads_num):
threads.append(threading.Thread(target=transaction, args=(i,)))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for thread in threads:
time.sleep(random.uniform(0, 0.5))
thread.start()
# Join here because it takes time for data to reach wal
for thread in threads:
thread.join()
time.sleep(1)
started_cluster.pause_container('postgres1')
for i in range(NUM_TABLES):
result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
print(result) # Just debug
started_cluster.unpause_container('postgres1')
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
print(result) # Just debug
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_drop_database_while_replication_startup_not_finished(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
create_postgres_table(cursor, table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(100000)".format(table_name))
for i in range(6):
create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
time.sleep(0.5 * i)
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_restart_server_while_replication_startup_not_finished(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
create_postgres_table(cursor, table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(100000)".format(table_name))
create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
time.sleep(0.5)
instance.restart_clickhouse()
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table postgresql_replica_{};'.format(i))
def test_abrupt_server_restart_while_heavy_replication(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 6
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
def transaction(thread_id):
if thread_id % 2:
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=True)
else:
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True, auto_commit=False)
cursor_ = conn.cursor()
for query in queries:
cursor_.execute(query.format(thread_id))
print('thread {}, query {}'.format(thread_id, query))
if thread_id % 2 == 0:
conn.commit()
threads = []
threads_num = 6
for i in range(threads_num):
threads.append(threading.Thread(target=transaction, args=(i,)))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for thread in threads:
time.sleep(random.uniform(0, 0.5))
thread.start()
# Join here because it takes time for data to reach wal
for thread in threads:
thread.join()
instance.restart_clickhouse()
for i in range(NUM_TABLES):
result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
print(result) # Just debug
for i in range(NUM_TABLES):
check_tables_are_synchronized('postgresql_replica_{}'.format(i));
for i in range(NUM_TABLES):
result = instance.query("SELECT count() FROM test_database.postgresql_replica_{}".format(i))
print(result) # Just debug
drop_materialized_db()
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_quoting(started_cluster):
table_name = 'user'
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
create_postgres_table(cursor, table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(50)".format(table_name))
create_materialized_db(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port)
check_tables_are_synchronized(table_name);
drop_postgres_table(cursor, table_name)
drop_materialized_db()
def test_user_managed_slots(started_cluster):
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
table_name = 'test_table'
create_postgres_table(cursor, table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
slot_name = 'user_slot'
replication_connection = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port,
database=True, replication=True, auto_commit=True)
snapshot = create_replication_slot(replication_connection, slot_name=slot_name)
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
settings=["materialized_postgresql_replication_slot = '{}'".format(slot_name),
"materialized_postgresql_snapshot = '{}'".format(snapshot)])
check_tables_are_synchronized(table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000, 10000)".format(table_name))
check_tables_are_synchronized(table_name);
instance.restart_clickhouse()
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(20000, 10000)".format(table_name))
check_tables_are_synchronized(table_name);
drop_postgres_table(cursor, table_name)
drop_materialized_db()
drop_replication_slot(replication_connection, slot_name)
cursor.execute('DROP TABLE IF EXISTS test_table')
def test_add_new_table_to_replication(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(10000)".format(i, i))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
result = instance.query("SHOW TABLES FROM test_database")
assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\n")
table_name = 'postgresql_replica_5'
create_postgres_table(cursor, table_name)
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(") # Check without ip
assert(result[-59:] == "\\'postgres_database\\', \\'postgres\\', \\'mysecretpassword\\')\n")
result = instance.query_and_get_error("ALTER DATABASE test_database MODIFY SETTING materialized_postgresql_tables_list='tabl1'")
assert('Changing setting `materialized_postgresql_tables_list` is not allowed' in result)
result = instance.query_and_get_error("ALTER DATABASE test_database MODIFY SETTING materialized_postgresql_tables='tabl1'")
assert('Database engine MaterializedPostgreSQL does not support setting' in result)
instance.query("ATTACH TABLE test_database.{}".format(table_name));
result = instance.query("SHOW TABLES FROM test_database")
assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\npostgresql_replica_5\n")
check_tables_are_synchronized(table_name);
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000, 10000)".format(table_name))
check_tables_are_synchronized(table_name);
result = instance.query_and_get_error("ATTACH TABLE test_database.{}".format(table_name));
assert('Table test_database.postgresql_replica_5 already exists' in result)
result = instance.query_and_get_error("ATTACH TABLE test_database.unknown_table");
assert('PostgreSQL table unknown_table does not exist' in result)
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-180:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4,postgresql_replica_5\\'\n")
table_name = 'postgresql_replica_6'
create_postgres_table(cursor, table_name)
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
instance.query("ATTACH TABLE test_database.{}".format(table_name));
instance.restart_clickhouse()
table_name = 'postgresql_replica_7'
create_postgres_table(cursor, table_name)
instance.query("INSERT INTO postgres_database.{} SELECT number, number from numbers(10000)".format(table_name))
instance.query("ATTACH TABLE test_database.{}".format(table_name));
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-222:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4,postgresql_replica_5,postgresql_replica_6,postgresql_replica_7\\'\n")
result = instance.query("SHOW TABLES FROM test_database")
assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\npostgresql_replica_5\npostgresql_replica_6\npostgresql_replica_7\n")
for i in range(NUM_TABLES + 3):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
for i in range(NUM_TABLES + 3):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_remove_table_from_replication(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port,
database=True)
cursor = conn.cursor()
NUM_TABLES = 5
for i in range(NUM_TABLES):
create_postgres_table(cursor, 'postgresql_replica_{}'.format(i));
instance.query("INSERT INTO postgres_database.postgresql_replica_{} SELECT number, {} from numbers(10000)".format(i, i))
create_materialized_db(ip=started_cluster.postgres_ip,
port=started_cluster.postgres_port)
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
result = instance.query("SHOW TABLES FROM test_database")
assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\npostgresql_replica_4\n")
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-59:] == "\\'postgres_database\\', \\'postgres\\', \\'mysecretpassword\\')\n")
table_name = 'postgresql_replica_4'
instance.query('DETACH TABLE test_database.{}'.format(table_name));
result = instance.query_and_get_error('SELECT * FROM test_database.{}'.format(table_name))
assert("doesn't exist" in result)
result = instance.query("SHOW TABLES FROM test_database")
assert(result == "postgresql_replica_0\npostgresql_replica_1\npostgresql_replica_2\npostgresql_replica_3\n")
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-138:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3\\'\n")
instance.query('ATTACH TABLE test_database.{}'.format(table_name));
check_tables_are_synchronized(table_name);
for i in range(NUM_TABLES):
table_name = 'postgresql_replica_{}'.format(i)
check_tables_are_synchronized(table_name);
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-159:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_1,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4\\'\n")
table_name = 'postgresql_replica_1'
instance.query('DETACH TABLE test_database.{}'.format(table_name));
result = instance.query('SHOW CREATE DATABASE test_database')
assert(result[:63] == "CREATE DATABASE test_database\\nENGINE = MaterializedPostgreSQL(")
assert(result[-138:] == ")\\nSETTINGS materialized_postgresql_tables_list = \\'postgresql_replica_0,postgresql_replica_2,postgresql_replica_3,postgresql_replica_4\\'\n")
for i in range(NUM_TABLES):
cursor.execute('drop table if exists postgresql_replica_{};'.format(i))
def test_predefined_connection_configuration(started_cluster):
drop_materialized_db()
conn = get_postgres_conn(ip=started_cluster.postgres_ip, port=started_cluster.postgres_port, database=True)
cursor = conn.cursor()
cursor.execute(f'DROP TABLE IF EXISTS test_table')
cursor.execute(f'CREATE TABLE test_table (key integer PRIMARY KEY, value integer)')
instance.query("CREATE DATABASE test_database ENGINE = MaterializedPostgreSQL(postgres1)")
check_tables_are_synchronized("test_table");
drop_materialized_db()
cursor.execute('DROP TABLE IF EXISTS test_table')
if __name__ == '__main__':
cluster.start()
input("Cluster created, press any key to destroy...")
cluster.shutdown()
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