mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 03:22:14 +00:00
101 lines
3.9 KiB
Python
101 lines
3.9 KiB
Python
import pytest
|
|
import time
|
|
import os, sys
|
|
|
|
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
|
|
import helpers
|
|
|
|
from helpers.cluster import ClickHouseCluster
|
|
from helpers.network import PartitionManager
|
|
|
|
|
|
cluster = ClickHouseCluster(__file__)
|
|
|
|
# Cluster with 2 shards of 2 replicas each. node_1_1 is the instance with Distributed table.
|
|
# Thus we have a shard with a local replica and a shard with remote replicas.
|
|
node_1_1 = instance_with_dist_table = cluster.add_instance(
|
|
'node_1_1', with_zookeeper=True, main_configs=['configs/remote_servers.xml'])
|
|
node_1_2 = cluster.add_instance('node_1_2', with_zookeeper=True)
|
|
node_2_1 = cluster.add_instance('node_2_1', with_zookeeper=True)
|
|
node_2_2 = cluster.add_instance('node_2_2', with_zookeeper=True)
|
|
|
|
@pytest.fixture(scope="module")
|
|
def started_cluster():
|
|
try:
|
|
cluster.start()
|
|
|
|
for shard in (1, 2):
|
|
for replica in (1, 2):
|
|
node = cluster.instances['node_{}_{}'.format(shard, replica)]
|
|
node.query('''
|
|
CREATE TABLE replicated (d Date, x UInt32) ENGINE =
|
|
ReplicatedMergeTree('/clickhouse/tables/{shard}/replicated', '{instance}', d, d, 8192)'''
|
|
.format(shard=shard, instance=node.name))
|
|
|
|
node_1_1.query(
|
|
"CREATE TABLE distributed (d Date, x UInt32) ENGINE = "
|
|
"Distributed('test_cluster', 'default', 'replicated')")
|
|
|
|
yield cluster
|
|
|
|
finally:
|
|
cluster.shutdown()
|
|
|
|
|
|
def test(started_cluster):
|
|
with PartitionManager() as pm:
|
|
# Hinder replication between replicas of the same shard, but leave the possibility of distributed connection.
|
|
pm.partition_instances(node_1_1, node_1_2, port=9009)
|
|
pm.partition_instances(node_2_1, node_2_2, port=9009)
|
|
|
|
node_1_2.query("INSERT INTO replicated VALUES ('2017-05-08', 1)")
|
|
node_2_2.query("INSERT INTO replicated VALUES ('2017-05-08', 2)")
|
|
|
|
time.sleep(1) # accrue replica delay
|
|
|
|
assert node_1_1.query("SELECT sum(x) FROM replicated").strip() == '0'
|
|
assert node_1_2.query("SELECT sum(x) FROM replicated").strip() == '1'
|
|
assert node_2_1.query("SELECT sum(x) FROM replicated").strip() == '0'
|
|
assert node_2_2.query("SELECT sum(x) FROM replicated").strip() == '2'
|
|
|
|
# With in_order balancing first replicas are chosen.
|
|
assert instance_with_dist_table.query(
|
|
"SELECT count() FROM distributed SETTINGS load_balancing='in_order'").strip() == '0'
|
|
|
|
# When we set max_replica_delay, first replicas must be excluded.
|
|
assert instance_with_dist_table.query('''
|
|
SELECT sum(x) FROM distributed SETTINGS
|
|
load_balancing='in_order',
|
|
max_replica_delay_for_distributed_queries=1
|
|
''').strip() == '3'
|
|
|
|
pm.drop_instance_zk_connections(node_1_2)
|
|
pm.drop_instance_zk_connections(node_2_2)
|
|
|
|
time.sleep(4) # allow pings to zookeeper to timeout (must be greater than ZK session timeout).
|
|
|
|
# At this point all replicas are stale, but the query must still go to second replicas which are the least stale ones.
|
|
assert instance_with_dist_table.query('''
|
|
SELECT sum(x) FROM distributed SETTINGS
|
|
load_balancing='in_order',
|
|
max_replica_delay_for_distributed_queries=1
|
|
''').strip() == '3'
|
|
|
|
# If we forbid stale replicas, the query must fail.
|
|
with pytest.raises(Exception):
|
|
print instance_with_dist_table.query('''
|
|
SELECT count() FROM distributed SETTINGS
|
|
load_balancing='in_order',
|
|
max_replica_delay_for_distributed_queries=1,
|
|
fallback_to_stale_replicas_for_distributed_queries=0
|
|
''')
|
|
|
|
# Now partition off the remote replica of the local shard and test that failover still works.
|
|
pm.partition_instances(node_1_1, node_1_2, port=9000)
|
|
|
|
assert instance_with_dist_table.query('''
|
|
SELECT sum(x) FROM distributed SETTINGS
|
|
load_balancing='in_order',
|
|
max_replica_delay_for_distributed_queries=1
|
|
''').strip() == '2'
|