ClickHouse/tests/integration/test_system_clusters_actual_information/test.py

import os
import sys
import time

import pytest

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from helpers.cluster import ClickHouseCluster
from helpers.network import PartitionManager

cluster = ClickHouseCluster(__file__)
node = cluster.add_instance('node', with_zookeeper=True, main_configs=['configs/remote_servers.xml'])
node_1 = cluster.add_instance('node_1', with_zookeeper=True)

@pytest.fixture(scope="module")
def started_cluster():
    try:
        cluster.start()
        node_1.query_with_retry('DROP TABLE IF EXISTS replicated')

        node_1.query_with_retry('''CREATE TABLE replicated (id UInt32, date Date) ENGINE =
            ReplicatedMergeTree('/clickhouse/tables/replicated', 'node_1')  ORDER BY id PARTITION BY toYYYYMM(date)''')

        node.query_with_retry("CREATE TABLE distributed (id UInt32, date Date) ENGINE = Distributed('test_cluster', 'default', 'replicated')")

        yield cluster

    finally:
        cluster.shutdown()



def test(started_cluster):
    cluster.pause_container("node_1")

    node.query("SYSTEM RELOAD CONFIG")
    node.query_and_get_error("SELECT count() FROM distributed SETTINGS receive_timeout=1")

    result = node.query("SELECT errors_count, estimated_recovery_time FROM system.clusters WHERE cluster='test_cluster' and host_name='node_1'")
    errors_count, recovery_time = map(int, result.split())
    assert errors_count == 3

    while True: 
        time.sleep(1)

        result = node.query("SELECT errors_count, estimated_recovery_time FROM system.clusters WHERE cluster='test_cluster' and host_name='node_1'")
        prev_time = recovery_time
        errors_count, recovery_time = map(int, result.split())

        if recovery_time == 0:
            break

        assert recovery_time < prev_time
        assert errors_count > 0

    assert recovery_time == 0
    assert errors_count == 0

    cluster.unpause_container("node_1")