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309 lines
9.7 KiB
Python
309 lines
9.7 KiB
Python
import pytest
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from helpers.client import QueryRuntimeException
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from helpers.cluster import ClickHouseCluster
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from helpers.test_tools import TSV
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from helpers.test_tools import assert_eq_with_retry
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cluster = ClickHouseCluster(__file__)
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def _fill_nodes(nodes, table_name):
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for node in nodes:
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node.query(
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"""
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CREATE DATABASE IF NOT EXISTS test;
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CREATE TABLE IF NOT EXISTS {0}(date Date, id UInt32)
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ENGINE = ReplicatedMergeTree('/clickhouse/tables/test/{0}', '{1}')
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ORDER BY id PARTITION BY toYYYYMM(date);
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""".format(
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table_name, node.name
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)
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)
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node1 = cluster.add_instance(
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"node1",
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main_configs=["configs/listen_host.xml"],
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with_zookeeper=True,
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ipv6_address="2001:3984:3989::1:1111",
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)
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node2 = cluster.add_instance(
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"node2",
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main_configs=["configs/listen_host.xml", "configs/dns_update_long.xml"],
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with_zookeeper=True,
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ipv6_address="2001:3984:3989::1:1112",
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)
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@pytest.fixture(scope="module")
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def cluster_without_dns_cache_update():
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try:
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cluster.start()
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_fill_nodes([node1, node2], "test_table_drop")
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yield cluster
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except Exception as ex:
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print(ex)
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finally:
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cluster.shutdown()
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pass
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# node1 is a source, node2 downloads data
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# node2 has long dns_cache_update_period, so dns cache update wouldn't work
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def test_ip_change_drop_dns_cache(cluster_without_dns_cache_update):
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# First we check, that normal replication works
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node1.query(
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"INSERT INTO test_table_drop VALUES ('2018-10-01', 1), ('2018-10-02', 2), ('2018-10-03', 3)"
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)
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assert node1.query("SELECT count(*) from test_table_drop") == "3\n"
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assert_eq_with_retry(node2, "SELECT count(*) from test_table_drop", "3")
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# We change source node ip
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cluster.restart_instance_with_ip_change(node1, "2001:3984:3989::1:7777")
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# Put some data to source node1
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node1.query(
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"INSERT INTO test_table_drop VALUES ('2018-10-01', 5), ('2018-10-02', 6), ('2018-10-03', 7)"
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)
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# Check that data is placed on node1
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assert node1.query("SELECT count(*) from test_table_drop") == "6\n"
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# Because of DNS cache dest node2 cannot download data from node1
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with pytest.raises(Exception):
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assert_eq_with_retry(node2, "SELECT count(*) from test_table_drop", "6")
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# drop DNS cache
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node2.query("SYSTEM DROP DNS CACHE")
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# Data is downloaded
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assert_eq_with_retry(node2, "SELECT count(*) from test_table_drop", "6")
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# Just to be sure check one more time
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node1.query("INSERT INTO test_table_drop VALUES ('2018-10-01', 8)")
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assert node1.query("SELECT count(*) from test_table_drop") == "7\n"
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assert_eq_with_retry(node2, "SELECT count(*) from test_table_drop", "7")
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node3 = cluster.add_instance(
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"node3",
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main_configs=["configs/listen_host.xml"],
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with_zookeeper=True,
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ipv6_address="2001:3984:3989::1:1113",
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)
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node4 = cluster.add_instance(
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"node4",
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main_configs=[
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"configs/remote_servers.xml",
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"configs/listen_host.xml",
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"configs/dns_update_short.xml",
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],
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with_zookeeper=True,
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ipv6_address="2001:3984:3989::1:1114",
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)
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@pytest.fixture(scope="module")
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def cluster_with_dns_cache_update():
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try:
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cluster.start()
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_fill_nodes([node3, node4], "test_table_update")
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yield cluster
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except Exception as ex:
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print(ex)
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finally:
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cluster.shutdown()
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pass
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# node3 is a source, node4 downloads data
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# node4 has short dns_cache_update_period, so testing update of dns cache
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def test_ip_change_update_dns_cache(cluster_with_dns_cache_update):
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# First we check, that normal replication works
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node3.query(
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"INSERT INTO test_table_update VALUES ('2018-10-01', 1), ('2018-10-02', 2), ('2018-10-03', 3)"
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)
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assert node3.query("SELECT count(*) from test_table_update") == "3\n"
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assert_eq_with_retry(node4, "SELECT count(*) from test_table_update", "3")
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# We change source node ip
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cluster.restart_instance_with_ip_change(node3, "2001:3984:3989::1:8888")
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# Put some data to source node3
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node3.query(
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"INSERT INTO test_table_update VALUES ('2018-10-01', 5), ('2018-10-02', 6), ('2018-10-03', 7)"
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)
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# Check that data is placed on node3
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assert node3.query("SELECT count(*) from test_table_update") == "6\n"
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curl_result = node4.exec_in_container(["bash", "-c", "curl -s 'node3:8123'"])
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assert curl_result == "Ok.\n"
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cat_resolv = node4.exec_in_container(["bash", "-c", "cat /etc/resolv.conf"])
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print(("RESOLV {}".format(cat_resolv)))
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assert_eq_with_retry(
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node4, "SELECT * FROM remote('node3', 'system', 'one')", "0", sleep_time=0.5
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)
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# Because of DNS cache update, ip of node3 would be updated
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assert_eq_with_retry(
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node4, "SELECT count(*) from test_table_update", "6", sleep_time=3
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)
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# Just to be sure check one more time
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node3.query("INSERT INTO test_table_update VALUES ('2018-10-01', 8)")
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assert node3.query("SELECT count(*) from test_table_update") == "7\n"
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assert_eq_with_retry(node4, "SELECT count(*) from test_table_update", "7")
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def set_hosts(node, hosts):
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new_content = "\\n".join(["127.0.0.1 localhost", "::1 localhost"] + hosts)
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node.exec_in_container(
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["bash", "-c", 'echo -e "{}" > /etc/hosts'.format(new_content)],
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privileged=True,
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user="root",
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)
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def test_dns_cache_update(cluster_with_dns_cache_update):
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set_hosts(node4, ["127.255.255.255 lost_host"])
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with pytest.raises(QueryRuntimeException):
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node4.query("SELECT * FROM remote('lost_host', 'system', 'one')")
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node4.query(
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"CREATE TABLE distributed_lost_host (dummy UInt8) ENGINE = Distributed(lost_host_cluster, 'system', 'one')"
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)
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with pytest.raises(QueryRuntimeException):
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node4.query("SELECT * FROM distributed_lost_host")
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set_hosts(node4, ["127.0.0.1 lost_host"])
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# Wait a bit until dns cache will be updated
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assert_eq_with_retry(
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node4, "SELECT * FROM remote('lost_host', 'system', 'one')", "0"
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)
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assert_eq_with_retry(node4, "SELECT * FROM distributed_lost_host", "0")
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assert TSV(
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node4.query(
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"SELECT DISTINCT host_name, host_address FROM system.clusters WHERE cluster='lost_host_cluster'"
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)
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) == TSV("lost_host\t127.0.0.1\n")
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assert TSV(node4.query("SELECT hostName()")) == TSV("node4")
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# Check SYSTEM DROP DNS CACHE on node5 and background cache update on node6
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node5 = cluster.add_instance(
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"node5",
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main_configs=["configs/listen_host.xml", "configs/dns_update_long.xml"],
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user_configs=["configs/users_with_hostname.xml"],
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ipv6_address="2001:3984:3989::1:1115",
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)
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node6 = cluster.add_instance(
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"node6",
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main_configs=["configs/listen_host.xml", "configs/dns_update_short.xml"],
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user_configs=["configs/users_with_hostname.xml"],
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ipv6_address="2001:3984:3989::1:1116",
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)
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@pytest.mark.parametrize("node", [node5, node6])
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def test_user_access_ip_change(cluster_with_dns_cache_update, node):
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node_name = node.name
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node_num = node.name[-1]
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# getaddrinfo(...) may hang for a log time without this options
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node.exec_in_container(
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[
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"bash",
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"-c",
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'echo -e "options timeout:1\noptions attempts:2" >> /etc/resolv.conf',
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],
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privileged=True,
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user="root",
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)
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assert (
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node3.query("SELECT * FROM remote('{}', 'system', 'one')".format(node_name))
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== "0\n"
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)
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assert (
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node4.query("SELECT * FROM remote('{}', 'system', 'one')".format(node_name))
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== "0\n"
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)
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set_hosts(
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node,
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[
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"127.255.255.255 node3",
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"2001:3984:3989::1:88{}4 unknown_host".format(node_num),
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],
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)
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cluster.restart_instance_with_ip_change(
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node3, "2001:3984:3989::1:88{}3".format(node_num)
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)
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cluster.restart_instance_with_ip_change(
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node4, "2001:3984:3989::1:88{}4".format(node_num)
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)
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with pytest.raises(QueryRuntimeException):
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node3.query("SELECT * FROM remote('{}', 'system', 'one')".format(node_name))
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with pytest.raises(QueryRuntimeException):
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node4.query("SELECT * FROM remote('{}', 'system', 'one')".format(node_name))
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# now wrong addresses are cached
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set_hosts(node, [])
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retry_count = 60
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if node_name == "node5":
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# client is not allowed to connect, so execute it directly in container to send query from localhost
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node.exec_in_container(
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["bash", "-c", 'clickhouse client -q "SYSTEM DROP DNS CACHE"'],
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privileged=True,
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user="root",
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)
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retry_count = 1
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assert_eq_with_retry(
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node3,
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"SELECT * FROM remote('{}', 'system', 'one')".format(node_name),
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"0",
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retry_count=retry_count,
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sleep_time=1,
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)
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assert_eq_with_retry(
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node4,
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"SELECT * FROM remote('{}', 'system', 'one')".format(node_name),
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"0",
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retry_count=retry_count,
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sleep_time=1,
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)
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def test_host_is_drop_from_cache_after_consecutive_failures(
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cluster_with_dns_cache_update,
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):
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with pytest.raises(QueryRuntimeException):
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node4.query(
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"SELECT * FROM remote('InvalidHostThatDoesNotExist', 'system', 'one')"
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)
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# Note that the list of hosts in variable since lost_host will be there too (and it's dropped and added back)
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# dns_update_short -> dns_max_consecutive_failures set to 6
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assert node4.wait_for_log_line(
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"Cannot resolve host \\(InvalidHostThatDoesNotExist\\), error 0: Host not found."
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)
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assert node4.wait_for_log_line(
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"Cached hosts not found:.*InvalidHostThatDoesNotExist**", repetitions=6
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)
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assert node4.wait_for_log_line(
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"Cached hosts dropped:.*InvalidHostThatDoesNotExist.*"
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)
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