ClickHouse/dbms/tests/integration/test_replicated_mutations/test.py

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import time
import threading
import random
from collections import Counter
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)
nodes = [node1, node2]
@pytest.fixture(scope="module")
def started_cluster():
try:
cluster.start()
for node in nodes:
node.query("DROP TABLE IF EXISTS test_mutations")
for node in nodes:
node.query("CREATE TABLE test_mutations(d Date, x UInt32, i UInt32) ENGINE ReplicatedMergeTree('/clickhouse/tables/test/test_mutations', '{instance}') ORDER BY x PARTITION BY toYYYYMM(d)")
yield cluster
finally:
cluster.shutdown()
class Runner:
def __init__(self):
self.mtx = threading.Lock()
self.total_inserted_xs = 0
self.total_inserted_rows = 0
self.total_mutations = 0
self.total_deleted_xs = 0
self.total_deleted_rows = 0
self.current_xs = Counter()
self.currently_inserting_xs = Counter()
self.currently_deleting_xs = set()
self.stop_ev = threading.Event()
def do_insert(self, thread_num):
self.stop_ev.wait(random.random())
# Each thread inserts a small random number of rows with random year, month 01 and day determined
# by the thread number. The idea is to avoid spurious duplicates and to insert into a
# nontrivial number of partitions.
month = '01'
day = str(thread_num + 1).zfill(2)
i = 1
while not self.stop_ev.is_set():
xs = [random.randint(1, 10) for _ in range(random.randint(1, 10))]
with self.mtx:
xs = [x for x in xs if x not in self.currently_deleting_xs]
if len(xs) == 0:
continue
for x in xs:
self.currently_inserting_xs[x] += 1
year = 2000 + random.randint(0, 10)
date_str = '{year}-{month}-{day}'.format(year=year, month=month, day=day)
payload = ''
for x in xs:
payload += '{date_str} {x} {i}\n'.format(date_str=date_str, x=x, i=i)
i += 1
try:
print 'thread {}: insert for {}: {}'.format(thread_num, date_str, ','.join(str(x) for x in xs))
random.choice(nodes).query("INSERT INTO test_mutations FORMAT TSV", payload)
with self.mtx:
for x in xs:
self.current_xs[x] += 1
self.total_inserted_xs += sum(xs)
self.total_inserted_rows += len(xs)
except Exception, e:
print 'Exception while inserting,', e
finally:
with self.mtx:
for x in xs:
self.currently_inserting_xs[x] -= 1
self.stop_ev.wait(0.2 + random.random() / 5)
def do_delete(self, thread_num):
self.stop_ev.wait(1.0 + random.random())
while not self.stop_ev.is_set():
chosen = False
with self.mtx:
if self.current_xs:
x = random.choice(list(self.current_xs.elements()))
if self.currently_inserting_xs[x] == 0 and x not in self.currently_deleting_xs:
chosen = True
self.currently_deleting_xs.add(x)
to_delete_count = self.current_xs[x]
if not chosen:
self.stop_ev.wait(0.1 * random.random())
continue
try:
print 'thread {}: delete {} * {}'.format(thread_num, to_delete_count, x)
random.choice(nodes).query("ALTER TABLE test_mutations DELETE WHERE x = {}".format(x))
with self.mtx:
self.total_mutations += 1
self.current_xs[x] -= to_delete_count
self.total_deleted_xs += to_delete_count * x
self.total_deleted_rows += to_delete_count
except Exception, e:
print 'Exception while deleting,', e
finally:
with self.mtx:
self.currently_deleting_xs.remove(x)
self.stop_ev.wait(1.0 + random.random() * 2)
def test_mutations(started_cluster):
DURATION_SECONDS = 50
runner = Runner()
threads = []
for thread_num in range(5):
threads.append(threading.Thread(target=runner.do_insert, args=(thread_num, )))
for thread_num in (11, 12, 13):
threads.append(threading.Thread(target=runner.do_delete, args=(thread_num,)))
for t in threads:
t.start()
time.sleep(DURATION_SECONDS)
runner.stop_ev.set()
for t in threads:
t.join()
# Sanity check: at least something was inserted and something was deleted
assert runner.total_inserted_rows > 0
assert runner.total_mutations > 0
all_done = False
for i in range(100): # wait for replication 10 seconds max
time.sleep(0.1)
def get_done_mutations(node):
return int(node.query("SELECT sum(is_done) FROM system.mutations WHERE table = 'test_mutations'").rstrip())
if all([get_done_mutations(n) == runner.total_mutations for n in nodes]):
all_done = True
break
print node1.query("SELECT mutation_id, command, parts_to_do, is_done FROM system.mutations WHERE table = 'test_mutations' FORMAT TSVWithNames")
assert all_done
expected_sum = runner.total_inserted_xs - runner.total_deleted_xs
actual_sums = []
for i, node in enumerate(nodes):
actual_sums.append(int(node.query("SELECT sum(x) FROM test_mutations").rstrip()))
assert actual_sums[i] == expected_sum