import pytest from helpers.cluster import ClickHouseCluster import random import string import os import time from multiprocessing.dummy import Pool from helpers.network import PartitionManager from helpers.test_tools import assert_eq_with_retry cluster = ClickHouseCluster(__file__) node1 = cluster.add_instance('node1', main_configs=['configs/enable_keeper1.xml', 'configs/use_keeper.xml'], stay_alive=True) node2 = cluster.add_instance('node2', main_configs=['configs/enable_keeper2.xml', 'configs/use_keeper.xml'], stay_alive=True) node3 = cluster.add_instance('node3', main_configs=['configs/enable_keeper3.xml', 'configs/use_keeper.xml'], stay_alive=True) from kazoo.client import KazooClient, KazooState @pytest.fixture(scope="module") def started_cluster(): try: cluster.start() yield cluster finally: cluster.shutdown() def smaller_exception(ex): return '\n'.join(str(ex).split('\n')[0:2]) def wait_node(node): for _ in range(100): zk = None try: node.query("SELECT * FROM system.zookeeper WHERE path = '/'") zk = get_fake_zk(node.name, timeout=30.0) zk.create("/test", sequence=True) print("node", node.name, "ready") break except Exception as ex: time.sleep(0.2) print("Waiting until", node.name, "will be ready, exception", ex) finally: if zk: zk.stop() zk.close() else: raise Exception("Can't wait node", node.name, "to become ready") def wait_nodes(): for node in [node1, node2, node3]: wait_node(node) def get_fake_zk(nodename, timeout=30.0): _fake_zk_instance = KazooClient(hosts=cluster.get_instance_ip(nodename) + ":9181", timeout=timeout) _fake_zk_instance.start() return _fake_zk_instance def test_read_write_multinode(started_cluster): try: wait_nodes() node1_zk = get_fake_zk("node1") node2_zk = get_fake_zk("node2") node3_zk = get_fake_zk("node3") node1_zk.create("/test_read_write_multinode_node1", b"somedata1") node2_zk.create("/test_read_write_multinode_node2", b"somedata2") node3_zk.create("/test_read_write_multinode_node3", b"somedata3") # stale reads are allowed while node1_zk.exists("/test_read_write_multinode_node2") is None: time.sleep(0.1) while node1_zk.exists("/test_read_write_multinode_node3") is None: time.sleep(0.1) while node2_zk.exists("/test_read_write_multinode_node3") is None: time.sleep(0.1) assert node3_zk.get("/test_read_write_multinode_node1")[0] == b"somedata1" assert node2_zk.get("/test_read_write_multinode_node1")[0] == b"somedata1" assert node1_zk.get("/test_read_write_multinode_node1")[0] == b"somedata1" assert node3_zk.get("/test_read_write_multinode_node2")[0] == b"somedata2" assert node2_zk.get("/test_read_write_multinode_node2")[0] == b"somedata2" assert node1_zk.get("/test_read_write_multinode_node2")[0] == b"somedata2" assert node3_zk.get("/test_read_write_multinode_node3")[0] == b"somedata3" assert node2_zk.get("/test_read_write_multinode_node3")[0] == b"somedata3" assert node1_zk.get("/test_read_write_multinode_node3")[0] == b"somedata3" finally: try: for zk_conn in [node1_zk, node2_zk, node3_zk]: zk_conn.stop() zk_conn.close() except: pass def test_watch_on_follower(started_cluster): try: wait_nodes() node1_zk = get_fake_zk("node1") node2_zk = get_fake_zk("node2") node3_zk = get_fake_zk("node3") node1_zk.create("/test_data_watches") node2_zk.set("/test_data_watches", b"hello") node3_zk.set("/test_data_watches", b"world") node1_data = None def node1_callback(event): print("node1 data watch called") nonlocal node1_data node1_data = event node1_zk.get("/test_data_watches", watch=node1_callback) node2_data = None def node2_callback(event): print("node2 data watch called") nonlocal node2_data node2_data = event node2_zk.get("/test_data_watches", watch=node2_callback) node3_data = None def node3_callback(event): print("node3 data watch called") nonlocal node3_data node3_data = event node3_zk.get("/test_data_watches", watch=node3_callback) node1_zk.set("/test_data_watches", b"somevalue") time.sleep(3) print(node1_data) print(node2_data) print(node3_data) assert node1_data == node2_data assert node3_data == node2_data finally: try: for zk_conn in [node1_zk, node2_zk, node3_zk]: zk_conn.stop() zk_conn.close() except: pass def test_session_expiration(started_cluster): try: wait_nodes() node1_zk = get_fake_zk("node1") node2_zk = get_fake_zk("node2") node3_zk = get_fake_zk("node3", timeout=3.0) print("Node3 session id", node3_zk._session_id) node3_zk.create("/test_ephemeral_node", b"world", ephemeral=True) with PartitionManager() as pm: pm.partition_instances(node3, node2) pm.partition_instances(node3, node1) node3_zk.stop() node3_zk.close() for _ in range(100): if node1_zk.exists("/test_ephemeral_node") is None and node2_zk.exists("/test_ephemeral_node") is None: break print("Node1 exists", node1_zk.exists("/test_ephemeral_node")) print("Node2 exists", node2_zk.exists("/test_ephemeral_node")) time.sleep(0.1) node1_zk.sync("/") node2_zk.sync("/") assert node1_zk.exists("/test_ephemeral_node") is None assert node2_zk.exists("/test_ephemeral_node") is None finally: try: for zk_conn in [node1_zk, node2_zk, node3_zk]: try: zk_conn.stop() zk_conn.close() except: pass except: pass def test_follower_restart(started_cluster): try: wait_nodes() node1_zk = get_fake_zk("node1") node1_zk.create("/test_restart_node", b"hello") node3.restart_clickhouse(kill=True) node3_zk = get_fake_zk("node3") # got data from log assert node3_zk.get("/test_restart_node")[0] == b"hello" finally: try: for zk_conn in [node1_zk, node3_zk]: try: zk_conn.stop() zk_conn.close() except: pass except: pass def test_simple_replicated_table(started_cluster): wait_nodes() for i, node in enumerate([node1, node2, node3]): node.query("CREATE TABLE t (value UInt64) ENGINE = ReplicatedMergeTree('/clickhouse/t', '{}') ORDER BY tuple()".format(i + 1)) node2.query("INSERT INTO t SELECT number FROM numbers(10)") node1.query("SYSTEM SYNC REPLICA t", timeout=10) node3.query("SYSTEM SYNC REPLICA t", timeout=10) assert_eq_with_retry(node1, "SELECT COUNT() FROM t", "10") assert_eq_with_retry(node2, "SELECT COUNT() FROM t", "10") assert_eq_with_retry(node3, "SELECT COUNT() FROM t", "10")