ClickHouse/tests/clickhouse-test

#!/usr/bin/env python3

# pylint: disable=too-many-return-statements
# pylint: disable=global-variable-not-assigned
# pylint: disable=too-many-lines
# pylint: disable=anomalous-backslash-in-string

import enum
from queue import Full
import shutil
import sys
import os
import os.path
import platform
import signal
import re
import copy
import traceback
import math

# Not requests, to avoid requiring extra dependency.
import http.client
import urllib.parse
import json

# for crc32
import zlib

from argparse import ArgumentParser
from typing import Tuple, Union, Optional, Dict, Set, List
import subprocess
from subprocess import Popen
from subprocess import PIPE
from datetime import datetime
from time import time, sleep
from errno import ESRCH

try:
    import termcolor  # type: ignore
except ImportError:
    termcolor = None

import random
import string
import multiprocessing
import socket
from contextlib import closing

USE_JINJA = True
try:
    import jinja2
except ImportError:
    USE_JINJA = False
    print("WARNING: jinja2 not installed! Template tests will be skipped.")

MESSAGES_TO_RETRY = [
    "ConnectionPoolWithFailover: Connection failed at try",
    "DB::Exception: New table appeared in database being dropped or detached. Try again",
    "is already started to be removing by another replica right now",
    # This is from LSan, and it indicates its own internal problem:
    "Unable to get registers from thread",
]

MAX_RETRIES = 3

TEST_FILE_EXTENSIONS = [".sql", ".sql.j2", ".sh", ".py", ".expect"]

VERSION_PATTERN = r"^((\d+\.)?(\d+\.)?(\d+\.)?\d+)$"


def stringhash(s):
    # default hash() function consistent
    # only during process invocation https://stackoverflow.com/a/42089311
    return zlib.crc32(s.encode("utf-8"))


# First and last lines of the log
def trim_for_log(s):
    if not s:
        return s
    lines = s.splitlines()
    if len(lines) > 10000:
        separator = "-" * 40 + str(len(lines) - 10000) + " lines are hidden" + "-" * 40
        return "\n".join(lines[:5000] + [] + [separator] + [] + lines[-5000:])
    else:
        return "\n".join(lines)


class HTTPError(Exception):
    def __init__(self, message=None, code=None):
        self.message = message
        self.code = code
        super().__init__(message)

    def __str__(self):
        return f"Code: {self.code}. {self.message}"


# Helpers to execute queries via HTTP interface.
def clickhouse_execute_http(
    base_args,
    query,
    timeout=30,
    settings=None,
    default_format=None,
    max_http_retries=5,
    retry_error_codes=False,
):
    if args.secure:
        client = http.client.HTTPSConnection(
            host=base_args.tcp_host, port=base_args.http_port, timeout=timeout
        )
    else:
        client = http.client.HTTPConnection(
            host=base_args.tcp_host, port=base_args.http_port, timeout=timeout
        )

    timeout = int(timeout)
    params = {
        "query": query,
        # hung check in stress tests may remove the database,
        # hence we should use 'system'.
        "database": "system",
        "connect_timeout": timeout,
        "receive_timeout": timeout,
        "send_timeout": timeout,
        "http_connection_timeout": timeout,
        "http_receive_timeout": timeout,
        "http_send_timeout": timeout,
        "output_format_parallel_formatting": 0,
    }
    if settings is not None:
        params.update(settings)
    if default_format is not None:
        params["default_format"] = default_format

    for i in range(max_http_retries):
        try:
            client.request(
                "POST",
                f"/?{base_args.client_options_query_str}{urllib.parse.urlencode(params)}",
            )
            res = client.getresponse()
            data = res.read()
            if res.status == 200 or (not retry_error_codes):
                break
        except Exception as ex:
            if i == max_http_retries - 1:
                raise ex
            client.close()
            sleep(i + 1)

    if res.status != 200:
        raise HTTPError(data.decode(), res.status)

    return data


def clickhouse_execute(
    base_args,
    query,
    timeout=30,
    settings=None,
    max_http_retries=5,
    retry_error_codes=False,
):
    return clickhouse_execute_http(
        base_args,
        query,
        timeout,
        settings,
        max_http_retries=max_http_retries,
        retry_error_codes=retry_error_codes,
    ).strip()


def clickhouse_execute_json(
    base_args, query, timeout=60, settings=None, max_http_retries=5
):
    data = clickhouse_execute_http(
        base_args,
        query,
        timeout,
        settings,
        "JSONEachRow",
        max_http_retries=max_http_retries,
    )
    if not data:
        return None
    rows = []
    for row in data.strip().splitlines():
        rows.append(json.loads(row))
    return rows


class Terminated(KeyboardInterrupt):
    pass


def signal_handler(sig, frame):
    raise Terminated(f"Terminated with {sig} signal")


def stop_tests():
    global stop_tests_triggered_lock
    global stop_tests_triggered
    global restarted_tests

    with stop_tests_triggered_lock:
        print("Stopping tests")
        if not stop_tests_triggered.is_set():
            stop_tests_triggered.set()

            # materialize multiprocessing.Manager().list() object before
            # sending SIGTERM since this object is a proxy, that requires
            # communicating with manager thread, but after SIGTERM will be
            # send, this thread will die, and you will get
            # ConnectionRefusedError error for any access to "restarted_tests"
            # variable.
            restarted_tests = [*restarted_tests]

            # send signal to all processes in group to avoid hung check triggering
            # (to avoid terminating clickhouse-test itself, the signal should be ignored)
            signal.signal(signal.SIGTERM, signal.SIG_IGN)
            os.killpg(os.getpgid(os.getpid()), signal.SIGTERM)
            signal.signal(signal.SIGTERM, signal.SIG_DFL)


def get_db_engine(args, database_name):
    if args.replicated_database:
        return f" ON CLUSTER test_cluster_database_replicated \
            ENGINE=Replicated('/test/clickhouse/db/{database_name}', \
            '{{shard}}', '{{replica}}')"
    if args.db_engine:
        return " ENGINE=" + args.db_engine
    return ""  # Will use default engine


def get_create_database_settings(args, testcase_args):
    create_database_settings = dict()
    if testcase_args:
        create_database_settings["log_comment"] = testcase_args.testcase_basename
    if args.db_engine == "Ordinary":
        create_database_settings["allow_deprecated_database_ordinary"] = 1
    return create_database_settings


def get_zookeeper_session_uptime(args):
    try:
        if args.replicated_database:
            return int(
                clickhouse_execute(
                    args,
                    """
            SELECT min(materialize(zookeeperSessionUptime()))
            FROM clusterAllReplicas('test_cluster_database_replicated', system.one)
            """,
                )
            )
        else:
            return int(clickhouse_execute(args, "SELECT zookeeperSessionUptime()"))
    except Exception:
        return None


def need_retry(args, stdout, stderr, total_time):
    if args.check_zookeeper_session:
        # Sometimes we may get unexpected exception like "Replica is readonly" or "Shutdown is called for table"
        # instead of "Session expired" or "Connection loss"
        # Retry if session was expired during test execution.
        # If ZooKeeper is configured, then it's more reliable than checking stderr,
        # but the following condition is always true if ZooKeeper is not configured.
        session_uptime = get_zookeeper_session_uptime(args)
        if session_uptime is not None and session_uptime < math.ceil(total_time):
            return True
    return any(msg in stdout for msg in MESSAGES_TO_RETRY) or any(
        msg in stderr for msg in MESSAGES_TO_RETRY
    )


def get_processlist_with_stacktraces(args):
    try:
        if args.replicated_database:
            return clickhouse_execute(
                args,
                """
            SELECT materialize(hostName() || '::' || tcpPort()::String) as host_port, *
            -- NOTE: view() here to do JOIN on shards, instead of initiator
            FROM clusterAllReplicas('test_cluster_database_replicated', view(
                SELECT
                    p.*,
                    arrayStringConcat(groupArray('Thread ID ' || toString(s.thread_id) || '\n' || arrayStringConcat(arrayMap(
                        x -> concat(addressToLine(x), '::', demangle(addressToSymbol(x))),
                        s.trace), '\n') AS stacktrace
                    )) AS stacktraces
                FROM system.processes p
                JOIN system.stack_trace s USING (query_id)
                WHERE query NOT LIKE '%system.processes%'
                GROUP BY p.*
            ))
            ORDER BY elapsed DESC FORMAT Vertical
            """,
                settings={
                    "allow_introspection_functions": 1,
                },
            )
        else:
            return clickhouse_execute(
                args,
                """
            SELECT
                p.*,
                arrayStringConcat(groupArray('Thread ID ' || toString(s.thread_id) || '\n' || arrayStringConcat(arrayMap(
                    x -> concat(addressToLine(x), '::', demangle(addressToSymbol(x))),
                    s.trace), '\n') AS stacktrace
                )) AS stacktraces
            FROM system.processes p
            JOIN system.stack_trace s USING (query_id)
            WHERE query NOT LIKE '%system.processes%'
            GROUP BY p.*
            ORDER BY elapsed DESC FORMAT Vertical
            """,
                settings={
                    "allow_introspection_functions": 1,
                },
            )
    except Exception as e:
        return "Failed to get processlist: " + str(e)


def get_transactions_list(args):
    try:
        if args.replicated_database:
            return clickhouse_execute_json(
                args,
                "SELECT materialize((hostName(), tcpPort())) as host, * FROM "
                "clusterAllReplicas('test_cluster_database_replicated', system.transactions)",
            )
        else:
            return clickhouse_execute_json(args, "select * from system.transactions")
    except Exception as e:
        return f"Cannot get list of transactions: {e}"


def kill_gdb_if_any():
    # Check if we have running gdb.
    code = subprocess.call("pidof gdb", shell=True)
    if code != 0:
        return

    for i in range(5):
        code = subprocess.call("kill -TERM $(pidof gdb)", shell=True, timeout=30)
        if code != 0:
            sleep(i)
        else:
            break


# collect server stacktraces using gdb
def get_stacktraces_from_gdb(server_pid):
    try:
        # We could attach gdb to clickhouse-server before running some tests
        # to print stacktraces of all crashes even if clickhouse cannot print it for some reason.
        # We should kill existing gdb if any before starting new one.
        kill_gdb_if_any()

        cmd = f"gdb -batch -ex 'thread apply all backtrace' -p {server_pid}"
        return subprocess.check_output(cmd, shell=True).decode("utf-8")
    except Exception as e:
        print(f"Error occurred while receiving stack traces from gdb: {e}")
        return None


# collect server stacktraces from system.stack_trace table
# it does not work in Sandbox
def get_stacktraces_from_clickhouse(args):
    settings_str = " ".join(
        [
            get_additional_client_options(args),
            "--allow_introspection_functions=1",
            "--skip_unavailable_shards=1",
        ]
    )
    replicated_msg = (
        f"{args.client} {settings_str} --query "
        '"SELECT materialize((hostName(), tcpPort())) as host, thread_name, thread_id, query_id, trace, '
        "arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), "
        "arrayMap(x -> addressToLine(x), trace), "
        "arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace_str "
        "FROM clusterAllReplicas('test_cluster_database_replicated', 'system.stack_trace') "
        'ORDER BY host, thread_id FORMAT Vertical"'
    )

    msg = (
        f"{args.client} {settings_str} --query "
        "\"SELECT thread_name, thread_id, query_id, trace, arrayStringConcat(arrayMap(x, y -> concat(x, ': ', y), "
        "arrayMap(x -> addressToLine(x), trace), "
        "arrayMap(x -> demangle(addressToSymbol(x)), trace)), '\n') as trace_str "
        'FROM system.stack_trace FORMAT Vertical"'
    )

    try:
        return subprocess.check_output(
            replicated_msg if args.replicated_database else msg,
            shell=True,
            stderr=subprocess.STDOUT,
        ).decode("utf-8")
    except Exception as e:
        print(f"Error occurred while receiving stack traces from client: {e}")
        return None


def print_stacktraces() -> None:
    server_pid = get_server_pid()

    bt = None

    if server_pid and not args.replicated_database:
        print("")
        print(
            f"Located ClickHouse server process {server_pid} listening at TCP port {args.tcp_port}"
        )
        print("Collecting stacktraces from all running threads with gdb:")

        bt = get_stacktraces_from_gdb(server_pid)

        if len(bt) < 1000:
            print("Got suspiciously small stacktraces: ", bt)
            bt = None

    if bt is None:
        print("\nCollecting stacktraces from system.stacktraces table:")

        bt = get_stacktraces_from_clickhouse(args)

    if bt is not None:
        print(bt)
        return

    print(
        colored(
            f"\nUnable to locate ClickHouse server process listening at TCP port "
            f"{args.tcp_port}. It must have crashed or exited prematurely!",
            args,
            "red",
            attrs=["bold"],
        )
    )


def get_server_pid():
    # lsof does not work in stress tests for some reason
    cmd_lsof = f"lsof -i tcp:{args.tcp_port} -s tcp:LISTEN -Fp | sed 's/^p//p;d'"
    cmd_pidof = "pidof -s clickhouse-server"

    commands = [cmd_lsof, cmd_pidof]
    output = None

    for cmd in commands:
        try:
            output = subprocess.check_output(
                cmd, shell=True, stderr=subprocess.STDOUT, universal_newlines=True
            )
            if output:
                return int(output)
        except Exception as e:
            print(f"Cannot get server pid with {cmd}, got {output}: {e}")

    return None  # most likely server is dead


def colored(text, args, color=None, on_color=None, attrs=None):
    if termcolor and (sys.stdout.isatty() or args.force_color):
        return termcolor.colored(text, color, on_color, attrs)
    else:
        return text


class TestStatus(enum.Enum):
    FAIL = "FAIL"
    UNKNOWN = "UNKNOWN"
    OK = "OK"
    SKIPPED = "SKIPPED"


class FailureReason(enum.Enum):
    # FAIL reasons
    TIMEOUT = "Timeout!"
    SERVER_DIED = "server died"
    EXIT_CODE = "return code: "
    STDERR = "having stderror: "
    EXCEPTION = "having exception in stdout: "
    RESULT_DIFF = "result differs with reference: "
    TOO_LONG = "Test runs too long (> 60s). Make it faster."
    INTERNAL_QUERY_FAIL = "Internal query (CREATE/DROP DATABASE) failed:"

    # SKIPPED reasons
    DISABLED = "disabled"
    SKIP = "skip"
    NO_JINJA = "no jinja"
    NO_ZOOKEEPER = "no zookeeper"
    NO_SHARD = "no shard"
    FAST_ONLY = "running fast tests only"
    NO_LONG = "not running long tests"
    REPLICATED_DB = "replicated-database"
    S3_STORAGE = "s3-storage"
    BUILD = "not running for current build"
    NO_PARALLEL_REPLICAS = "smth in not supported with parallel replicas"

    # UNKNOWN reasons
    NO_REFERENCE = "no reference file"
    INTERNAL_ERROR = "Test internal error: "


def threshold_generator(always_on_prob, always_off_prob, min_val, max_val):
    def gen():
        tmp = random.random()
        if tmp <= always_on_prob:
            return min_val
        if tmp <= always_on_prob + always_off_prob:
            return max_val

        if isinstance(min_val, int) and isinstance(max_val, int):
            return random.randint(min_val, max_val)
        else:
            return random.uniform(min_val, max_val)

    return gen


# To keep dependency list as short as possible, tzdata is not used here (to
# avoid try/except block for import)
def get_localzone():
    return os.getenv("TZ", "/".join(os.readlink("/etc/localtime").split("/")[-2:]))


class SettingsRandomizer:
    settings = {
        "max_insert_threads": lambda: 0
        if random.random() < 0.5
        else random.randint(1, 16),
        "group_by_two_level_threshold": threshold_generator(0.2, 0.2, 1, 1000000),
        "group_by_two_level_threshold_bytes": threshold_generator(
            0.2, 0.2, 1, 50000000
        ),
        "distributed_aggregation_memory_efficient": lambda: random.randint(0, 1),
        "fsync_metadata": lambda: random.randint(0, 1),
        "output_format_parallel_formatting": lambda: random.randint(0, 1),
        "input_format_parallel_parsing": lambda: random.randint(0, 1),
        "min_chunk_bytes_for_parallel_parsing": lambda: max(
            1024, int(random.gauss(10 * 1024 * 1024, 5 * 1000 * 1000))
        ),
        "max_read_buffer_size": lambda: random.randint(500000, 1048576),
        "prefer_localhost_replica": lambda: random.randint(0, 1),
        "max_block_size": lambda: random.randint(8000, 100000),
        "max_threads": lambda: random.randint(1, 64),
        "optimize_or_like_chain": lambda: random.randint(0, 1),
        "optimize_read_in_order": lambda: random.randint(0, 1),
        "enable_multiple_prewhere_read_steps": lambda: random.randint(0, 1),
        "read_in_order_two_level_merge_threshold": lambda: random.randint(0, 100),
        "optimize_aggregation_in_order": lambda: random.randint(0, 1),
        "aggregation_in_order_max_block_bytes": lambda: random.randint(0, 50000000),
        "min_compress_block_size": lambda: random.randint(1, 1048576 * 3),
        "max_compress_block_size": lambda: random.randint(1, 1048576 * 3),
        "use_uncompressed_cache": lambda: random.randint(0, 1),
        "min_bytes_to_use_direct_io": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "min_bytes_to_use_mmap_io": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "local_filesystem_read_method": lambda: random.choice(
            # Allow to use uring only when running on Linux
            ["read", "pread", "mmap", "pread_threadpool", "io_uring"]
            if platform.system().lower() == "linux"
            else ["read", "pread", "mmap", "pread_threadpool"]
        ),
        "remote_filesystem_read_method": lambda: random.choice(["read", "threadpool"]),
        "local_filesystem_read_prefetch": lambda: random.randint(0, 1),
        "remote_filesystem_read_prefetch": lambda: random.randint(0, 1),
        "allow_prefetched_read_pool_for_remote_filesystem": lambda: random.randint(
            0, 1
        ),
        "filesystem_prefetch_max_memory_usage": lambda: random.choice(
            ["32Mi", "64Mi", "128Mi"]
        ),
        "filesystem_prefetches_limit": lambda: random.choice(
            [0, 10]
        ),  # 0 means unlimited (but anyway limited by prefetch_max_memory_usage)
        "filesystem_prefetch_min_bytes_for_single_read_task": lambda: random.choice(
            ["1Mi", "8Mi", "16Mi"]
        ),
        "filesystem_prefetch_step_marks": lambda: random.choice(
            [0, 50]
        ),  # 0 means 'auto'
        "filesystem_prefetch_step_bytes": lambda: random.choice(
            [0, "100Mi"]
        ),  # 0 means 'auto'
        # "compile_expressions": lambda: random.randint(0, 1), - this setting has a bug: https://github.com/ClickHouse/ClickHouse/issues/51264
        "compile_aggregate_expressions": lambda: random.randint(0, 1),
        "compile_sort_description": lambda: random.randint(0, 1),
        "merge_tree_coarse_index_granularity": lambda: random.randint(2, 32),
        "optimize_distinct_in_order": lambda: random.randint(0, 1),
        "optimize_sorting_by_input_stream_properties": lambda: random.randint(0, 1),
        "http_response_buffer_size": lambda: random.randint(0, 10 * 1048576),
        "http_wait_end_of_query": lambda: random.random() > 0.5,
        "enable_memory_bound_merging_of_aggregation_results": lambda: random.randint(
            0, 1
        ),
        "min_count_to_compile_expression": lambda: random.choice([0, 3]),
        "min_count_to_compile_aggregate_expression": lambda: random.choice([0, 3]),
        "min_count_to_compile_sort_description": lambda: random.choice([0, 3]),
        "session_timezone": lambda: random.choice(
            [
                # special non-deterministic around 1970 timezone, see [1].
                #
                #   [1]: https://github.com/ClickHouse/ClickHouse/issues/42653
                "America/Mazatlan",
                "America/Hermosillo",
                "Mexico/BajaSur",
                # These timezones had DST transitions on some unusual dates (e.g. 2000-01-15 12:00:00).
                "Africa/Khartoum",
                "Africa/Juba",
                # server default that is randomized across all timezones
                # NOTE: due to lots of trickery we cannot use empty timezone here, but this should be the same.
                get_localzone(),
            ]
        ),
    }

    @staticmethod
    def get_random_settings(args):
        random_settings = {}
        is_debug = BuildFlags.DEBUG in args.build_flags
        for setting, generator in SettingsRandomizer.settings.items():
            if (
                is_debug
                and setting == "allow_prefetched_read_pool_for_remote_filesystem"
            ):
                random_settings[setting] = 0
            else:
                random_settings[setting] = generator()
        return random_settings


class MergeTreeSettingsRandomizer:
    settings = {
        "ratio_of_defaults_for_sparse_serialization": threshold_generator(
            0.3, 0.5, 0.0, 1.0
        ),
        "prefer_fetch_merged_part_size_threshold": threshold_generator(
            0.2, 0.5, 1, 10 * 1024 * 1024 * 1024
        ),
        "vertical_merge_algorithm_min_rows_to_activate": threshold_generator(
            0.4, 0.4, 1, 1000000
        ),
        "vertical_merge_algorithm_min_columns_to_activate": threshold_generator(
            0.4, 0.4, 1, 100
        ),
        "allow_vertical_merges_from_compact_to_wide_parts": lambda: random.randint(
            0, 1
        ),
        "min_merge_bytes_to_use_direct_io": threshold_generator(
            0.25, 0.25, 1, 10 * 1024 * 1024 * 1024
        ),
        "index_granularity_bytes": lambda: random.randint(1024, 30 * 1024 * 1024),
        "merge_max_block_size": lambda: random.randint(1, 8192 * 3),
        "index_granularity": lambda: random.randint(1, 65536),
        "min_bytes_for_wide_part": threshold_generator(0.3, 0.3, 0, 1024 * 1024 * 1024),
        "compress_marks": lambda: random.randint(0, 1),
        "compress_primary_key": lambda: random.randint(0, 1),
        "marks_compress_block_size": lambda: random.randint(8000, 100000),
        "primary_key_compress_block_size": lambda: random.randint(8000, 100000),
        "replace_long_file_name_to_hash": lambda: random.randint(0, 1),
        "max_file_name_length": threshold_generator(0.3, 0.3, 0, 128),
    }

    @staticmethod
    def get_random_settings(args):
        random_settings = {}
        for setting, generator in MergeTreeSettingsRandomizer.settings.items():
            if setting not in args.changed_merge_tree_settings:
                random_settings[setting] = generator()
        return random_settings


class TestResult:
    def __init__(
        self,
        case_name: str,
        status: TestStatus,
        reason: Optional[FailureReason],
        total_time: float,
        description: str,
    ):
        self.case_name: str = case_name
        self.status: TestStatus = status
        self.reason: Optional[FailureReason] = reason
        self.total_time: float = total_time
        self.description: str = description
        self.need_retry: bool = False

    def check_if_need_retry(self, args, stdout, stderr, runs_count):
        if (
            self.status != TestStatus.FAIL
            or not need_retry(args, stdout, stderr, self.total_time)
            or MAX_RETRIES < runs_count
        ):
            return
        self.need_retry = True


class TestCase:
    @staticmethod
    def get_description_from_exception_info(exc_info):
        exc_type, exc_value, tb = exc_info
        exc_name = exc_type.__name__
        traceback_str = "\n".join(traceback.format_tb(tb, 10))
        description = f"\n{exc_name}\n{exc_value}\n{traceback_str}"
        return description

    @staticmethod
    def get_reference_file(suite_dir, name):
        """
        Returns reference file name for specified test
        """

        name = removesuffix(name, ".gen")
        for ext in [".reference", ".gen.reference"]:
            reference_file = os.path.join(suite_dir, name) + ext
            if os.path.isfile(reference_file):
                return reference_file
        return None

    @staticmethod
    def configure_testcase_args(args, case_file, suite_tmp_dir):
        testcase_args = copy.deepcopy(args)

        testcase_args.testcase_start_time = datetime.now()
        testcase_basename = os.path.basename(case_file)
        testcase_args.testcase_client = (
            f"{testcase_args.client} --log_comment '{testcase_basename}'"
        )
        testcase_args.testcase_basename = testcase_basename

        if testcase_args.database:
            database = testcase_args.database
            os.environ.setdefault("CLICKHOUSE_DATABASE", database)
            os.environ.setdefault("CLICKHOUSE_TMP", suite_tmp_dir)
            testcase_args.test_tmp_dir = suite_tmp_dir
        else:
            # If --database is not specified, we will create temporary database with
            # unique name and we will recreate and drop it for each test
            def random_str(length=8):
                alphabet = string.ascii_lowercase + string.digits
                # NOTE: it is important not to use default random generator, since it shares state.
                return "".join(
                    random.SystemRandom().choice(alphabet) for _ in range(length)
                )

            database = f"test_{random_str()}"

            clickhouse_execute(
                args,
                "CREATE DATABASE IF NOT EXISTS "
                + database
                + get_db_engine(testcase_args, database),
                settings=get_create_database_settings(args, testcase_args),
            )

            os.environ["CLICKHOUSE_DATABASE"] = database
            # Set temporary directory to match the randomly generated database,
            # because .sh tests also use it for temporary files and we want to avoid
            # collisions.
            testcase_args.test_tmp_dir = os.path.join(suite_tmp_dir, database)
            os.mkdir(testcase_args.test_tmp_dir)
            os.environ["CLICKHOUSE_TMP"] = testcase_args.test_tmp_dir

        testcase_args.testcase_database = database

        # Printed only in case of failures
        #
        # NOTE: here we use "CLICKHOUSE_TMP" instead of "file_suffix",
        # so it is installed in configure_testcase_args() unlike other files
        # (stdout_file, stderr_file) in TestCase::__init__().
        # Since using CLICKHOUSE_TMP is easier to use in expect.
        testcase_args.debug_log_file = (
            os.path.join(testcase_args.test_tmp_dir, testcase_basename) + ".debuglog"
        )

        return testcase_args

    @staticmethod
    def cli_format_settings(settings_list) -> str:
        out = []
        for k, v in settings_list.items():
            out.extend([f"--{k}", str(v)])
        return " ".join(out)

    @staticmethod
    def http_format_settings(settings_list) -> str:
        return urllib.parse.urlencode(settings_list)

    def has_show_create_table_in_test(self):
        return not subprocess.call(["grep", "-iq", "show create", self.case_file])

    def add_random_settings(self, client_options):
        new_options = ""
        if self.randomize_settings:
            http_params = self.http_format_settings(self.random_settings)
            if len(self.base_url_params) == 0:
                os.environ["CLICKHOUSE_URL_PARAMS"] = http_params
            else:
                os.environ["CLICKHOUSE_URL_PARAMS"] = (
                    self.base_url_params + "&" + http_params
                )

            new_options += f" {self.cli_format_settings(self.random_settings)}"

        if self.randomize_merge_tree_settings:
            new_options += f" --allow_merge_tree_settings {self.cli_format_settings(self.merge_tree_random_settings)}"

        if new_options != "":
            new_options += " --allow_repeated_settings"

            os.environ["CLICKHOUSE_CLIENT_OPT"] = (
                self.base_client_options + new_options + " "
            )

        return client_options + new_options

    def remove_random_settings_from_env(self):
        os.environ["CLICKHOUSE_URL_PARAMS"] = self.base_url_params
        os.environ["CLICKHOUSE_CLIENT_OPT"] = self.base_client_options

    def add_info_about_settings(self, description):
        if self.randomize_settings:
            description += f"\nSettings used in the test: {self.cli_format_settings(self.random_settings)}"
        if self.randomize_merge_tree_settings:
            description += f"\n\nMergeTree settings used in test: {self.cli_format_settings(self.merge_tree_random_settings)}"

        return description + "\n"

    def __init__(self, suite, case: str, args, is_concurrent: bool):
        self.case: str = case  # case file name
        self.tags: Set[str] = suite.all_tags[case] if case in suite.all_tags else set()

        for tag in os.getenv("GLOBAL_TAGS", "").split(","):
            self.tags.add(tag.strip())

        self.case_file: str = os.path.join(suite.suite_path, case)
        (self.name, self.ext) = os.path.splitext(case)

        file_suffix = f".{os.getpid()}" if is_concurrent and args.test_runs > 1 else ""
        self.reference_file = self.get_reference_file(suite.suite_path, self.name)
        self.stdout_file = (
            os.path.join(suite.suite_tmp_path, self.name) + file_suffix + ".stdout"
        )
        self.stderr_file = (
            os.path.join(suite.suite_tmp_path, self.name) + file_suffix + ".stderr"
        )

        self.testcase_args = None
        self.runs_count = 0

        has_no_random_settings_tag = self.tags and "no-random-settings" in self.tags

        self.randomize_settings = not (
            args.no_random_settings or has_no_random_settings_tag
        )

        has_no_random_merge_tree_settings_tag = (
            self.tags and "no-random-merge-tree-settings" in self.tags
        )

        # If test contains SHOW CREATE TABLE do not
        # randomize merge tree settings, because
        # they will be added to table definition and test will fail
        self.randomize_merge_tree_settings = not (
            args.no_random_merge_tree_settings
            or has_no_random_settings_tag
            or has_no_random_merge_tree_settings_tag
            or self.has_show_create_table_in_test()
        )

        if self.randomize_settings:
            self.random_settings = SettingsRandomizer.get_random_settings(args)

        if self.randomize_merge_tree_settings:
            self.merge_tree_random_settings = (
                MergeTreeSettingsRandomizer.get_random_settings(args)
            )

        self.base_url_params = (
            os.environ["CLICKHOUSE_URL_PARAMS"]
            if "CLICKHOUSE_URL_PARAMS" in os.environ
            else ""
        )

        self.base_client_options = (
            os.environ["CLICKHOUSE_CLIENT_OPT"]
            if "CLICKHOUSE_CLIENT_OPT" in os.environ
            else ""
        )

    # should skip test, should increment skipped_total, skip reason
    def should_skip_test(self, suite) -> Optional[FailureReason]:
        tags = self.tags

        if tags and ("disabled" in tags) and not args.disabled:
            return FailureReason.DISABLED

        elif (
            os.path.exists(os.path.join(suite.suite_path, self.name) + ".disabled")
            and not args.disabled
        ):
            return FailureReason.DISABLED

        elif "no-parallel-replicas" in tags and args.no_parallel_replicas:
            return FailureReason.NO_PARALLEL_REPLICAS

        elif args.skip and any(s in self.name for s in args.skip):
            return FailureReason.SKIP

        elif not USE_JINJA and self.ext.endswith("j2"):
            return FailureReason.NO_JINJA

        elif (
            tags
            and (("zookeeper" in tags) or ("replica" in tags))
            and not args.zookeeper
        ):
            return FailureReason.NO_ZOOKEEPER

        elif (
            tags
            and (("shard" in tags) or ("distributed" in tags) or ("global" in tags))
            and not args.shard
        ):
            return FailureReason.NO_SHARD

        elif tags and ("no-fasttest" in tags) and args.fast_tests_only:
            return FailureReason.FAST_ONLY

        elif (
            tags
            and (("long" in tags) or ("deadlock" in tags) or ("race" in tags))
            and args.no_long
        ):
            # Tests for races and deadlocks usually are run in a loop for a significant amount of time
            return FailureReason.NO_LONG

        elif tags and ("no-replicated-database" in tags) and args.replicated_database:
            return FailureReason.REPLICATED_DB

        elif tags and ("no-s3-storage" in tags) and args.s3_storage:
            return FailureReason.S3_STORAGE
        elif (
            tags
            and ("no-s3-storage-with-slow-build" in tags)
            and args.s3_storage
            and (
                BuildFlags.THREAD in args.build_flags
                or BuildFlags.DEBUG in args.build_flags
            )
        ):
            return FailureReason.S3_STORAGE

        elif tags:
            for build_flag in args.build_flags:
                if "no-" + build_flag in tags:
                    return FailureReason.BUILD
            for tag in tags:
                tag = tag.replace("-", "_")
                if tag.startswith("use_") and tag not in args.build_flags:
                    return FailureReason.BUILD

        return None

    def process_result_impl(
        self, proc, stdout: str, stderr: str, debug_log: str, total_time: float
    ):
        description = ""

        debug_log = trim_for_log(debug_log)

        if proc:
            if proc.returncode is None:
                try:
                    proc.kill()
                except OSError as e:
                    if e.errno != ESRCH:
                        raise

                if stderr:
                    description += stderr
                if debug_log:
                    description += "\n"
                    description += debug_log
                return TestResult(
                    self.name,
                    TestStatus.FAIL,
                    FailureReason.TIMEOUT,
                    total_time,
                    description,
                )

            if proc.returncode != 0:
                reason = FailureReason.EXIT_CODE
                description += str(proc.returncode)

                if stderr:
                    description += "\n"
                    description += stderr
                if debug_log:
                    description += "\n"
                    description += debug_log

                # Stop on fatal errors like segmentation fault. They are sent to client via logs.
                if " <Fatal> " in stderr:
                    reason = FailureReason.SERVER_DIED

                if (
                    self.testcase_args.stop
                    and (
                        "Connection refused" in stderr
                        or "Attempt to read after eof" in stderr
                    )
                    and "Received exception from server" not in stderr
                ):
                    reason = FailureReason.SERVER_DIED

                if os.path.isfile(self.stdout_file):
                    description += ", result:\n\n"
                    with open(self.stdout_file, "rb") as f:
                        description += trim_for_log(
                            f.read().decode("utf-8", errors="ignore")
                        )
                    description += "\n"

                description += f"\nstdout:\n{stdout}\n"
                return TestResult(
                    self.name, TestStatus.FAIL, reason, total_time, description
                )

        if stderr:
            description += "\n"
            description += trim_for_log(stderr)
            description += "\n"
            description += "\nstdout:\n"
            description += trim_for_log(stdout)
            description += "\n"
            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.STDERR,
                total_time,
                description,
            )

        if "Exception" in stdout:
            description += "\n"
            description += trim_for_log(stdout)
            description += "\n"
            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.EXCEPTION,
                total_time,
                description,
            )

        if "@@SKIP@@" in stdout:
            skip_reason = stdout.replace("@@SKIP@@", "").rstrip("\n")
            description += " - "
            description += skip_reason
            return TestResult(
                self.name,
                TestStatus.SKIPPED,
                FailureReason.SKIP,
                total_time,
                description,
            )

        if self.reference_file is None:
            return TestResult(
                self.name,
                TestStatus.UNKNOWN,
                FailureReason.NO_REFERENCE,
                total_time,
                description,
            )

        result_is_different = subprocess.call(
            ["diff", "-q", self.reference_file, self.stdout_file], stdout=PIPE
        )

        if result_is_different:
            diff = Popen(
                [
                    "diff",
                    "-U",
                    str(self.testcase_args.unified),
                    self.reference_file,
                    self.stdout_file,
                ],
                encoding="latin-1",
                stdout=PIPE,
                universal_newlines=True,
            ).communicate()[0]
            if diff.startswith("Binary files "):
                diff += "Content of stdout:\n===================\n"
                file = open(self.stdout_file, "rb")
                diff += str(file.read())
                file.close()
                diff += "==================="
            description += f"\n{diff}\n"
            if debug_log:
                description += "\n"
                description += debug_log
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.RESULT_DIFF,
                total_time,
                description,
            )

        if (
            self.testcase_args.test_runs > 1
            and total_time > 120
            and "long" not in self.tags
        ):
            if debug_log:
                description += "\n"
                description += debug_log
            # We're in Flaky Check mode, check the run time as well while we're at it.
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.TOO_LONG,
                total_time,
                description,
            )

        if os.path.exists(self.stdout_file):
            os.remove(self.stdout_file)
        if os.path.exists(self.stderr_file):
            os.remove(self.stderr_file)
        if os.path.exists(self.testcase_args.debug_log_file):
            os.remove(self.testcase_args.debug_log_file)

        return TestResult(self.name, TestStatus.OK, None, total_time, description)

    @staticmethod
    def print_test_time(test_time) -> str:
        if args.print_time:
            return f" {test_time:.2f} sec."
        else:
            return ""

    def process_result(self, result: TestResult, messages):
        description_full = messages[result.status]
        description_full += self.print_test_time(result.total_time)
        if result.reason is not None:
            description_full += " - "
            description_full += result.reason.value

        description_full += result.description

        if BuildFlags.SANITIZE_COVERAGE in args.build_flags:
            clickhouse_execute(
                args,
                f"INSERT INTO system.coverage SELECT '{self.case}', coverage()",
                retry_error_codes=True,
            )

            coverage = clickhouse_execute(
                args,
                f"SELECT length(coverage())",
                retry_error_codes=True,
            ).decode()

            description_full += f" Coverage: {coverage}"

        description_full += "\n"

        if result.status == TestStatus.FAIL and self.testcase_args:
            description_full += "Database: " + self.testcase_args.testcase_database

        result.description = description_full
        return result

    @staticmethod
    def send_test_name_failed(suite: str, case: str):
        pid = os.getpid()
        clickhouse_execute(
            args,
            f"SELECT 'Running test {suite}/{case} from pid={pid}'",
            retry_error_codes=True,
        )

    def run_single_test(
        self, server_logs_level, client_options
    ) -> Tuple[Optional[Popen], str, str, str, float]:
        args = self.testcase_args
        client = args.testcase_client
        start_time = args.testcase_start_time
        database = args.testcase_database

        # This is for .sh tests
        os.environ["CLICKHOUSE_LOG_COMMENT"] = args.testcase_basename

        query_params = ""
        if "need-query-parameters" in self.tags:
            query_params = (
                " --param_CLICKHOUSE_DATABASE="
                + database
                + " --param_CLICKHOUSE_DATABASE_1="
                + database
                + "_1"
            )

        params = {
            "client": client + " --database=" + database + query_params,
            "logs_level": server_logs_level,
            "options": client_options,
            "test": self.case_file,
            "stdout": self.stdout_file,
            "stderr": self.stderr_file,
            "secure": "--secure" if args.secure else "",
        }

        # >> append to stderr (but not stdout since it is not used there),
        # because there are also output of per test database creation
        pattern = "{test} > {stdout} 2> {stderr}"

        if self.ext == ".sql":
            pattern = (
                "{client} --send_logs_level={logs_level} {secure} --multiquery {options} < "
                + pattern
            )

        # We want to calculate per-test code coverage. That's why we reset it before each test.
        if BuildFlags.SANITIZE_COVERAGE in args.build_flags:
            clickhouse_execute(
                args,
                "SYSTEM RESET COVERAGE",
                retry_error_codes=True,
            )

        command = pattern.format(**params)

        proc = Popen(command, shell=True, env=os.environ)

        while (
            datetime.now() - start_time
        ).total_seconds() < args.timeout and proc.poll() is None:
            sleep(0.01)

        debug_log = ""
        if os.path.exists(self.testcase_args.debug_log_file):
            with open(self.testcase_args.debug_log_file, "rb") as stream:
                debug_log += self.testcase_args.debug_log_file + ":\n"
                debug_log += str(stream.read(), errors="replace", encoding="utf-8")
                debug_log += "\n"

        total_time = (datetime.now() - start_time).total_seconds()

        # Normalize randomized database names in stdout, stderr files.
        os.system(f"LC_ALL=C sed -i -e 's/{database}/default/g' {self.stdout_file}")
        if args.hide_db_name:
            os.system(f"LC_ALL=C sed -i -e 's/{database}/default/g' {self.stderr_file}")
        if args.replicated_database:
            os.system(f"LC_ALL=C sed -i -e 's|/auto_{{shard}}||g' {self.stdout_file}")
            os.system(f"LC_ALL=C sed -i -e 's|auto_{{replica}}||g' {self.stdout_file}")

        # Normalize hostname in stdout file.
        os.system(
            f"LC_ALL=C sed -i -e 's/{socket.gethostname()}/localhost/g' {self.stdout_file}"
        )

        stdout = ""
        if os.path.exists(self.stdout_file):
            with open(self.stdout_file, "rb") as stdfd:
                stdout = str(stdfd.read(), errors="replace", encoding="utf-8")

        stderr = ""
        if os.path.exists(self.stderr_file):
            with open(self.stderr_file, "rb") as stdfd:
                stderr += str(stdfd.read(), errors="replace", encoding="utf-8")

        return proc, stdout, stderr, debug_log, total_time

    def run(self, args, suite, client_options, server_logs_level):
        start_time = datetime.now()

        try:
            skip_reason = self.should_skip_test(suite)
            if skip_reason is not None:
                return TestResult(self.name, TestStatus.SKIPPED, skip_reason, 0.0, "")

            if args.testname:
                try:
                    self.send_test_name_failed(suite.suite, self.case)
                except Exception:
                    return TestResult(
                        self.name,
                        TestStatus.FAIL,
                        FailureReason.SERVER_DIED,
                        0.0,
                        "\nServer does not respond to health check\n",
                    )

            self.runs_count += 1
            self.testcase_args = self.configure_testcase_args(
                args, self.case_file, suite.suite_tmp_path
            )
            client_options = self.add_random_settings(client_options)
            proc, stdout, stderr, debug_log, total_time = self.run_single_test(
                server_logs_level, client_options
            )

            result = self.process_result_impl(
                proc, stdout, stderr, debug_log, total_time
            )
            result.check_if_need_retry(args, stdout, stderr, self.runs_count)
            # to avoid breaking CSV parser
            result.description = result.description.replace("\0", "")

            if result.status == TestStatus.FAIL:
                result.description = self.add_info_about_settings(result.description)

            self._cleanup(result.status == TestStatus.OK)

            return result
        except KeyboardInterrupt as e:
            raise e
        except HTTPError:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.INTERNAL_QUERY_FAIL,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except socket.timeout:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.INTERNAL_QUERY_FAIL,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except (ConnectionError, http.client.ImproperConnectionState):
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.FAIL,
                FailureReason.SERVER_DIED,
                total_time,
                self.add_info_about_settings(
                    self.get_description_from_exception_info(sys.exc_info())
                ),
            )
        except Exception:
            total_time = (datetime.now() - start_time).total_seconds()
            return TestResult(
                self.name,
                TestStatus.UNKNOWN,
                FailureReason.INTERNAL_ERROR,
                total_time,
                self.get_description_from_exception_info(sys.exc_info()),
            )
        finally:
            self.remove_random_settings_from_env()

    def _cleanup(self, passed):
        args = self.testcase_args

        need_cleanup = not args.database
        if need_cleanup and args.no_drop_if_fail:
            need_cleanup = passed

        if not need_cleanup:
            return

        time_passed = (datetime.now() - args.testcase_start_time).total_seconds()
        timeout = max(args.timeout - time_passed, 20)

        self._cleanup_database(args, timeout)
        shutil.rmtree(args.test_tmp_dir)

    def _cleanup_database(self, args, timeout):
        database = args.testcase_database

        # Check if the test does not cleanup its tables.
        # Only for newly added tests. Please extend this check to the old tests as well.
        if self.case_file >= "02800":
            leftover_tables = (
                clickhouse_execute(
                    args,
                    f"SHOW TABLES FROM {database}",
                    timeout=timeout,
                    settings={
                        "log_comment": args.testcase_basename,
                    },
                )
                .decode()
                .replace("\n", ", ")
            )

            if len(leftover_tables) != 0:
                raise Exception(
                    f"The test should cleanup its tables ({leftover_tables}), otherwise it is inconvenient for running it locally."
                )

        drop_database_query = f"DROP DATABASE IF EXISTS {database}"
        if args.replicated_database:
            drop_database_query += " ON CLUSTER test_cluster_database_replicated"

        # It's possible to get an error "New table appeared in database being dropped or detached. Try again."
        for _ in range(1, 60):
            try:
                clickhouse_execute(
                    args,
                    drop_database_query,
                    timeout=timeout,
                    settings={
                        "log_comment": args.testcase_basename,
                    },
                )
            except HTTPError as e:
                if need_retry(args, e.message, e.message, 0):
                    continue
                raise
            break


class TestSuite:
    @staticmethod
    def tests_in_suite_key_func(item: str) -> float:
        if args.order == "random":
            return random.random()

        reverse = 1 if args.order == "asc" else -1

        if -1 == item.find("_"):
            return 99998

        prefix, _ = item.split("_", 1)

        try:
            return reverse * int(prefix)
        except ValueError:
            return 99997

    @staticmethod
    def render_test_template(j2env, suite_dir, test_name):
        """
        Render template for test and reference file if needed
        """

        if j2env is None:
            return test_name

        test_base_name = removesuffix(test_name, ".sql.j2", ".sql")

        reference_file_name = test_base_name + ".reference.j2"
        reference_file_path = os.path.join(suite_dir, reference_file_name)
        if os.path.isfile(reference_file_path):
            tpl = j2env.get_template(reference_file_name)
            tpl.stream().dump(
                os.path.join(suite_dir, test_base_name) + ".gen.reference"
            )

        if test_name.endswith(".sql.j2"):
            tpl = j2env.get_template(test_name)
            generated_test_name = test_base_name + ".gen.sql"
            tpl.stream().dump(os.path.join(suite_dir, generated_test_name))
            return generated_test_name

        return test_name

    @staticmethod
    def read_test_tags(suite_dir: str, all_tests: List[str]) -> Dict[str, Set[str]]:
        def get_comment_sign(filename):
            if filename.endswith(".sql") or filename.endswith(".sql.j2"):
                return "--"
            elif (
                filename.endswith(".sh")
                or filename.endswith(".py")
                or filename.endswith(".expect")
            ):
                return "#"
            else:
                raise Exception(f"Unknown file_extension: {filename}")

        def parse_tags_from_line(line, comment_sign) -> Set[str]:
            if not line.startswith(comment_sign):
                return set()
            tags_str = line[len(comment_sign) :].lstrip()  # noqa: ignore E203
            tags_prefix = "Tags:"
            if not tags_str.startswith(tags_prefix):
                return set()
            tags_str = tags_str[len(tags_prefix) :]  # noqa: ignore E203
            tags = tags_str.split(",")
            tags = {tag.strip() for tag in tags}
            return tags

        def is_shebang(line: str) -> bool:
            return line.startswith("#!")

        def find_tag_line(file):
            for line in file:
                line = line.strip()
                if line and not is_shebang(line):
                    return line
            return ""

        def load_tags_from_file(filepath):
            comment_sign = get_comment_sign(filepath)
            need_query_params = False
            with open(filepath, "r", encoding="utf-8") as file:
                try:
                    tag_line = find_tag_line(file)
                except UnicodeDecodeError:
                    return []
                try:
                    if filepath.endswith(".sql"):
                        for line in file:
                            if "{CLICKHOUSE_DATABASE" in line:
                                need_query_params = True
                except UnicodeDecodeError:
                    pass
            parsed_tags = parse_tags_from_line(tag_line, comment_sign)
            if need_query_params:
                parsed_tags.add("need-query-parameters")
            return parsed_tags

        all_tags = {}
        start_time = datetime.now()
        for test_name in all_tests:
            tags = load_tags_from_file(os.path.join(suite_dir, test_name))
            if tags:
                all_tags[test_name] = tags
        elapsed = (datetime.now() - start_time).total_seconds()
        if elapsed > 1:
            print(f"Tags for suite {suite_dir} read in {elapsed:.2f} seconds")
        return all_tags

    def __init__(self, args, suite_path: str, suite_tmp_path: str, suite: str):
        self.args = args
        self.suite_path: str = suite_path
        self.suite_tmp_path: str = suite_tmp_path
        self.suite: str = suite

        filter_func = lambda x: True  # noqa: ignore E731

        if args.run_by_hash_num is not None and args.run_by_hash_total is not None:
            if args.run_by_hash_num > args.run_by_hash_total:
                raise Exception(
                    f"Incorrect run by hash, value {args.run_by_hash_num} bigger than total {args.run_by_hash_total}"
                )

            filter_func = (
                lambda x: stringhash(x) % args.run_by_hash_total == args.run_by_hash_num
            )

        self.all_tests: List[str] = self.get_tests_list(
            self.tests_in_suite_key_func, filter_func
        )
        self.all_tags: Dict[str, Set[str]] = self.read_test_tags(
            self.suite_path, self.all_tests
        )

        self.sequential_tests = []
        self.parallel_tests = []
        for test_name in self.all_tests:
            if self.is_sequential_test(test_name):
                self.sequential_tests.append(test_name)
            else:
                self.parallel_tests.append(test_name)

    def is_sequential_test(self, test_name):
        if args.sequential:
            if any(s in test_name for s in args.sequential):
                return True

        if test_name not in self.all_tags:
            return False

        return ("no-parallel" in self.all_tags[test_name]) or (
            "sequential" in self.all_tags[test_name]
        )

    def get_tests_list(self, sort_key, filter_func):
        """
        Return list of tests file names to run
        """

        all_tests = list(self.get_selected_tests(filter_func))
        all_tests = all_tests * self.args.test_runs
        all_tests.sort(key=sort_key)
        return all_tests

    def get_selected_tests(self, filter_func):
        """
        Find all files with tests, filter, render templates
        """

        j2env = (
            jinja2.Environment(
                loader=jinja2.FileSystemLoader(self.suite_path),
                keep_trailing_newline=True,
            )
            if USE_JINJA
            else None
        )

        for test_name in os.listdir(self.suite_path):
            if not is_test_from_dir(self.suite_path, test_name):
                continue
            if self.args.test and not any(
                re.search(pattern, test_name) for pattern in self.args.test
            ):
                continue
            if USE_JINJA and test_name.endswith(".gen.sql"):
                continue
            if not filter_func(test_name):
                continue
            test_name = self.render_test_template(j2env, self.suite_path, test_name)
            yield test_name

    @staticmethod
    def read_test_suite(args, suite_dir_name: str):
        def is_data_present():
            try:
                return int(clickhouse_execute(args, "EXISTS TABLE test.hits"))
            except Exception as e:
                print(
                    "Cannot check if dataset is available, assuming it's not: ", str(e)
                )
                return False

        base_dir = os.path.abspath(args.queries)
        tmp_dir = os.path.abspath(args.tmp)
        suite_path = os.path.join(base_dir, suite_dir_name)

        suite_re_obj = re.search("^[0-9]+_(.*)$", suite_dir_name)
        if not suite_re_obj:  # skip .gitignore and so on
            return None

        suite_tmp_path = os.path.join(tmp_dir, suite_dir_name)
        if not os.path.exists(suite_tmp_path):
            os.makedirs(suite_tmp_path)

        suite = suite_re_obj.group(1)

        if not os.path.isdir(suite_path):
            return None

        if "stateful" in suite and not args.no_stateful and not is_data_present():
            print("Won't run stateful tests because test data wasn't loaded.")
            return None
        if "stateless" in suite and args.no_stateless:
            print("Won't run stateless tests because they were manually disabled.")
            return None
        if "stateful" in suite and args.no_stateful:
            print("Won't run stateful tests because they were manually disabled.")
            return None

        return TestSuite(args, suite_path, suite_tmp_path, suite)


stop_time = None
exit_code = None
server_died = None
stop_tests_triggered_lock = None
stop_tests_triggered = None
queue = None
multiprocessing_manager = None
restarted_tests = None


def run_tests_array(all_tests_with_params: Tuple[List[str], int, TestSuite]):
    all_tests, num_tests, test_suite = all_tests_with_params
    global stop_time
    global exit_code
    global server_died
    global restarted_tests

    OP_SQUARE_BRACKET = colored("[", args, attrs=["bold"])
    CL_SQUARE_BRACKET = colored("]", args, attrs=["bold"])

    MSG_FAIL = (
        OP_SQUARE_BRACKET
        + colored(" FAIL ", args, "red", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_UNKNOWN = (
        OP_SQUARE_BRACKET
        + colored(" UNKNOWN ", args, "yellow", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_OK = (
        OP_SQUARE_BRACKET
        + colored(" OK ", args, "green", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )
    MSG_SKIPPED = (
        OP_SQUARE_BRACKET
        + colored(" SKIPPED ", args, "cyan", attrs=["bold"])
        + CL_SQUARE_BRACKET
    )

    MESSAGES = {
        TestStatus.FAIL: MSG_FAIL,
        TestStatus.UNKNOWN: MSG_UNKNOWN,
        TestStatus.OK: MSG_OK,
        TestStatus.SKIPPED: MSG_SKIPPED,
    }

    passed_total = 0
    skipped_total = 0
    failures_total = 0
    failures_chain = 0
    start_time = datetime.now()

    is_concurrent = multiprocessing.current_process().name != "MainProcess"

    client_options = get_additional_client_options(args)

    if num_tests > 0:
        about = "about " if is_concurrent else ""
        proc_name = multiprocessing.current_process().name
        print(f"\nRunning {about}{num_tests} {test_suite.suite} tests ({proc_name}).\n")

    while True:
        if is_concurrent:
            case = queue.get(timeout=args.timeout * 1.1)
            if not case:
                break
        else:
            if all_tests:
                case = all_tests.pop(0)
            else:
                break

        if server_died.is_set():
            stop_tests()
            break

        if stop_time and time() > stop_time:
            print("\nStop tests run because global time limit is exceeded.\n")
            stop_tests()
            break

        test_case = TestCase(test_suite, case, args, is_concurrent)

        try:
            description = ""
            test_cace_name = removesuffix(test_case.name, ".gen", ".sql") + ": "
            if not is_concurrent:
                sys.stdout.flush()
                sys.stdout.write(f"{test_cace_name:72}")
                # This flush is needed so you can see the test name of the long
                # running test before it will finish. But don't do it in parallel
                # mode, so that the lines don't mix.
                sys.stdout.flush()
            else:
                description = f"{test_cace_name:72}"

            while True:
                test_result = test_case.run(
                    args, test_suite, client_options, server_logs_level
                )
                test_result = test_case.process_result(test_result, MESSAGES)
                if not test_result.need_retry:
                    break
                restarted_tests.append(test_result)

            # First print the description, than invoke the check result logic
            description += test_result.description

            if description and not description.endswith("\n"):
                description += "\n"

            sys.stdout.write(description)
            sys.stdout.flush()

            if test_result.status == TestStatus.OK:
                passed_total += 1
                failures_chain = 0
            elif test_result.status == TestStatus.FAIL:
                failures_total += 1
                failures_chain += 1
                if test_result.reason == FailureReason.SERVER_DIED:
                    server_died.set()
                    stop_tests()
            elif test_result.status == TestStatus.SKIPPED:
                skipped_total += 1

        except KeyboardInterrupt as e:
            print(colored("Break tests execution", args, "red"))
            stop_tests()
            raise e

        if failures_chain >= args.max_failures_chain:
            stop_tests()
            break

    if failures_total > 0:
        print(
            colored(
                f"\nHaving {failures_total} errors! {passed_total} tests passed."
                f" {skipped_total} tests skipped."
                f" {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
                f" ({multiprocessing.current_process().name}).",
                args,
                "red",
                attrs=["bold"],
            )
        )
        exit_code.value = 1
    else:
        print(
            colored(
                f"\n{passed_total} tests passed. {skipped_total} tests skipped."
                f" {(datetime.now() - start_time).total_seconds():.2f} s elapsed"
                f" ({multiprocessing.current_process().name}).",
                args,
                "green",
                attrs=["bold"],
            )
        )

    sys.stdout.flush()


server_logs_level = "warning"


def check_server_started(args):
    print("Connecting to ClickHouse server...", end="")

    sys.stdout.flush()
    retry_count = args.server_check_retries
    while retry_count > 0:
        try:
            clickhouse_execute(args, "SELECT 1", max_http_retries=1)
            print(" OK")
            sys.stdout.flush()
            return True
        except (ConnectionError, http.client.ImproperConnectionState) as e:
            if args.hung_check:
                print("Connection error, will retry: ", str(e))
            else:
                print(".", end="")
            sys.stdout.flush()
            retry_count -= 1
            sleep(0.5)
            continue
        except TimeoutError:
            print("\nConnection timeout, will not retry")
            break
        except Exception as e:
            print(
                "\nUexpected exception, will not retry: ",
                type(e).__name__,
                ": ",
                str(e),
            )
            break

    print("\nAll connection tries failed")
    sys.stdout.flush()
    return False


class BuildFlags:
    THREAD = "tsan"
    ADDRESS = "asan"
    UNDEFINED = "ubsan"
    MEMORY = "msan"
    DEBUG = "debug"
    SANITIZE_COVERAGE = "sanitize-coverage"
    RELEASE = "release"
    ORDINARY_DATABASE = "ordinary-database"
    POLYMORPHIC_PARTS = "polymorphic-parts"


def collect_build_flags(args):
    result = []

    value = clickhouse_execute(
        args, "SELECT value FROM system.build_options WHERE name = 'CXX_FLAGS'"
    )
    if b"-fsanitize=thread" in value:
        result.append(BuildFlags.THREAD)
    elif b"-fsanitize=address" in value:
        result.append(BuildFlags.ADDRESS)
    elif b"-fsanitize=undefined" in value:
        result.append(BuildFlags.UNDEFINED)
    elif b"-fsanitize=memory" in value:
        result.append(BuildFlags.MEMORY)
    elif b"-DSANITIZE_COVERAGE=1" in value:
        result.append(BuildFlags.SANITIZE_COVERAGE)

    value = clickhouse_execute(
        args, "SELECT value FROM system.build_options WHERE name = 'BUILD_TYPE'"
    )
    if b"Debug" in value:
        result.append(BuildFlags.DEBUG)
    elif b"RelWithDebInfo" in value or b"Release" in value:
        result.append(BuildFlags.RELEASE)

    value = clickhouse_execute(
        args,
        "SELECT value FROM system.settings WHERE name = 'allow_deprecated_database_ordinary'",
    )
    if value == b"1" or args.db_engine == "Ordinary":
        result.append(BuildFlags.ORDINARY_DATABASE)

    value = int(
        clickhouse_execute(
            args,
            "SELECT value FROM system.merge_tree_settings WHERE name = 'min_bytes_for_wide_part'",
        )
    )
    if value == 0:
        result.append(BuildFlags.POLYMORPHIC_PARTS)

    use_flags = clickhouse_execute(
        args,
        "SELECT name FROM system.build_options WHERE name like 'USE_%' AND value in ('ON', '1')",
    )
    for use_flag in use_flags.strip().splitlines():
        use_flag = use_flag.decode().lower()
        result.append(use_flag)

    system_processor = clickhouse_execute(
        args,
        "SELECT value FROM system.build_options WHERE name = 'SYSTEM_PROCESSOR' LIMIT 1",
    ).strip()
    if system_processor:
        result.append(f"cpu-{system_processor.decode().lower()}")

    return result


def collect_changed_merge_tree_settings(args):
    changed_settings = (
        clickhouse_execute(
            args,
            "SELECT name FROM system.merge_tree_settings WHERE changed",
        )
        .strip()
        .splitlines()
    )

    return list(map(lambda s: s.decode(), changed_settings))


def check_table_column(args, database, table, column):
    return (
        int(
            clickhouse_execute(
                args,
                f"""
    SELECT count()
    FROM system.columns
    WHERE database = '{database}' AND table = '{table}' AND name = '{column}'
    """,
            )
        )
        > 0
    )


def suite_key_func(item: str) -> Union[float, Tuple[int, str]]:
    if args.order == "random":
        return random.random()

    if -1 == item.find("_"):
        return 99998, ""

    prefix, suffix = item.split("_", 1)

    try:
        return int(prefix), suffix
    except ValueError:
        return 99997, ""


def extract_key(key: str) -> str:
    return subprocess.getstatusoutput(
        args.extract_from_config + " --try --config " + args.configserver + key
    )[1]


def do_run_tests(jobs, test_suite: TestSuite, parallel):
    if jobs > 1 and len(test_suite.parallel_tests) > 0:
        print(
            "Found",
            len(test_suite.parallel_tests),
            "parallel tests and",
            len(test_suite.sequential_tests),
            "sequential tests",
        )
        run_n, run_total = parallel.split("/")
        run_n = float(run_n)
        run_total = float(run_total)
        tests_n = len(test_suite.parallel_tests)
        run_total = min(run_total, tests_n)

        jobs = min(jobs, tests_n)
        run_total = max(jobs, run_total)

        batch_size = max(1, len(test_suite.parallel_tests) // jobs)
        parallel_tests_array = []
        for _ in range(jobs):
            parallel_tests_array.append((None, batch_size, test_suite))

        try:
            with closing(multiprocessing.Pool(processes=jobs)) as pool:
                pool.map_async(run_tests_array, parallel_tests_array)

                for suit in test_suite.parallel_tests:
                    queue.put(suit, timeout=args.timeout * 1.1)

                for _ in range(jobs):
                    queue.put(None, timeout=args.timeout * 1.1)

                queue.close()
        except Full:
            print(
                "Couldn't put test to the queue within timeout. Server probably hung."
            )
            print_stacktraces()
            queue.close()

        pool.join()

        run_tests_array(
            (test_suite.sequential_tests, len(test_suite.sequential_tests), test_suite)
        )
        return len(test_suite.sequential_tests) + len(test_suite.parallel_tests)
    else:
        num_tests = len(test_suite.all_tests)
        run_tests_array((test_suite.all_tests, num_tests, test_suite))
        return num_tests


def is_test_from_dir(suite_dir, case):
    case_file = os.path.join(suite_dir, case)
    # We could also test for executable files (os.access(case_file, os.X_OK),
    # but it interferes with 01610_client_spawn_editor.editor, which is invoked
    # as a query editor in the test, and must be marked as executable.
    return os.path.isfile(case_file) and any(
        case_file.endswith(suppotred_ext) for suppotred_ext in TEST_FILE_EXTENSIONS
    )


def removesuffix(text, *suffixes):
    """
    Added in python 3.9
    https://www.python.org/dev/peps/pep-0616/

    This version can work with several possible suffixes
    """
    for suffix in suffixes:
        if suffix and text.endswith(suffix):
            return text[: -len(suffix)]
    return text


def reportCoverageFor(args, what, query, permissive=False):
    value = clickhouse_execute(args, query).decode()

    if value != "":
        print(f"\nThe following {what} were not covered by tests:\n")
        print(value)
        print("\n")
        return permissive

    return True


# This is high-level coverage on per-component basis (functions, data types, etc.)
# Don't be confused with the code coverage.
def reportCoverage(args):
    clickhouse_execute(args, "SYSTEM FLUSH LOGS")

    return (
        reportCoverageFor(
            args,
            "functions",
            """
            SELECT name
            FROM system.functions
            WHERE NOT is_aggregate AND origin = 'System' AND alias_to = ''
                AND name NOT IN
                (
                    SELECT arrayJoin(used_functions) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
            True,
        )
        and reportCoverageFor(
            args,
            "aggregate functions",
            """
            SELECT name
            FROM system.functions
            WHERE is_aggregate AND origin = 'System' AND alias_to = ''
                AND name NOT IN
                (
                    SELECT arrayJoin(used_aggregate_functions) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
        and reportCoverageFor(
            args,
            "aggregate function combinators",
            """
            SELECT name
            FROM system.aggregate_function_combinators
            WHERE NOT is_internal
                AND name NOT IN
                (
                    SELECT arrayJoin(used_aggregate_function_combinators) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
        and reportCoverageFor(
            args,
            "data type families",
            """
            SELECT name
            FROM system.data_type_families
            WHERE alias_to = '' AND name NOT LIKE 'Interval%'
                AND name NOT IN
                (
                    SELECT arrayJoin(used_data_type_families) FROM system.query_log WHERE event_date >= yesterday()
                )
            ORDER BY name
        """,
        )
    )


def reportLogStats(args):
    clickhouse_execute(args, "SYSTEM FLUSH LOGS")

    query = """
        WITH
            240 AS mins,
            (
                SELECT (count(), sum(length(message)))
                FROM system.text_log
                WHERE (now() - toIntervalMinute(mins)) < event_time
            ) AS total
        SELECT
            count() AS count,
            round(count / (total.1), 3) AS `count_%`,
            formatReadableSize(sum(length(message))) AS size,
            round(sum(length(message)) / (total.2), 3) AS `size_%`,
            countDistinct(logger_name) AS uniq_loggers,
            countDistinct(thread_id) AS uniq_threads,
            groupArrayDistinct(toString(level)) AS levels,
            round(sum(query_id = '') / count, 3) AS `background_%`,
            message_format_string
        FROM system.text_log
        WHERE (now() - toIntervalMinute(mins)) < event_time
        GROUP BY message_format_string
        ORDER BY count DESC
        LIMIT 100
        FORMAT TSVWithNamesAndTypes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop patterns of log messages:\n")
    print(value)
    print("\n")

    query = """
        WITH
            240 AS mins
        SELECT
            count() AS count,
            substr(replaceRegexpAll(message, '[^A-Za-z]+', ''), 1, 32) AS pattern,
            substr(any(message), 1, 256) as runtime_message,
            any((extract(source_file, '\/[a-zA-Z0-9_]+\.[a-z]+'), source_line)) as line
        FROM system.text_log
        WHERE (now() - toIntervalMinute(mins)) < event_time AND message_format_string = ''
        GROUP BY pattern
        ORDER BY count DESC
        LIMIT 30
        FORMAT TSVWithNamesAndTypes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages without format string (fmt::runtime):\n")
    print(value)
    print("\n")

    query = """
        SELECT message_format_string, count(), any(message) AS any_message
        FROM system.text_log
        WHERE (now() - toIntervalMinute(240)) < event_time
        AND (message NOT LIKE (replaceRegexpAll(message_format_string, '{[:.0-9dfx]*}', '%') AS s))
        AND (message NOT LIKE concat('%Exception: ', s, '%'))
        GROUP BY message_format_string ORDER BY count() DESC LIMIT 20 FORMAT TSVWithNamesAndTypes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages that does not match its format string:\n")
    print(value)
    print("\n")

    query = """
        WITH ('', '({}) Keys: {}', '({}) {}', 'Aggregating', 'Became leader', 'Cleaning queue',
              'Creating set.', 'Cyclic aliases', 'Detaching {}', 'Executing {}', 'Fire events: {}',
              'Found part {}', 'Loaded queue', 'No sharding key', 'No tables', 'Query: {}',
              'Removed', 'Removed part {}', 'Removing parts.', 'Request URI: {}', 'Sending part {}',
              'Sent handshake', 'Starting {}', 'Will mimic {}', 'Writing to {}', 'dropIfEmpty',
              'loadAll {}', '{} ({}:{})', '{} -> {}', '{} {}', '{}: {}', '{}%', 'Read object: {}',
              'New segment: {}', 'Convert overflow', 'Division by zero', 'Files set to {}',
              'Bytes set to {}', 'Numeric overflow', 'Invalid mode: {}',
              'Write file: {}', 'Unable to parse JSONPath', 'Host is empty in S3 URI.', 'Expected end of line',
              'inflate failed: {}{}', 'Center is not valid', 'Column ''{}'' is ambiguous', 'Cannot parse object', 'Invalid date: {}',
              'There is no cache by name: {}', 'No part {} in table', '`{}` should be a String', 'There are duplicate id {}',
              'Invalid replica name: {}', 'Unexpected value {} in enum', 'Unknown BSON type: {}', 'Point is not valid',
              'Invalid qualified name: {}', 'INTO OUTFILE is not allowed', 'Arguments must not be NaN', 'Cell is not valid',
              'brotli decode error{}', 'Invalid H3 index: {}', 'Too large node state size', 'No additional keys found.',
              'Attempt to read after EOF.', 'Replication was stopped', '{}	building file infos', 'Cannot parse uuid {}',
              'Query was cancelled', 'Cancelled merging parts', 'Cancelled mutating parts', 'Log pulling is cancelled',
              'Transaction was cancelled', 'Could not find table: {}', 'Table {} doesn''t exist',
              'Database {} doesn''t exist', 'Dictionary ({}) not found', 'Unknown table function {}',
              'Unknown format {}', 'Unknown explain kind ''{}''', 'Unknown setting {}', 'Unknown input format {}',
              'Unknown identifier: ''{}''', 'User name is empty', 'Expected function, got: {}',
              'Attempt to read after eof', 'String size is too big ({}), maximum: {}'
        ) AS known_short_messages
        SELECT count() AS c, message_format_string, substr(any(message), 1, 120),
            min(if(length(regexpExtract(message, '(.*)\\([A-Z0-9_]+\\)')) as pref > 0, pref, length(message)) - 26 AS length_without_exception_boilerplate) AS min_length_without_exception_boilerplate
        FROM system.text_log
        WHERE (now() - toIntervalMinute(240)) < event_time
            AND (length(message_format_string) < 16
                OR (message ilike '%DB::Exception%' AND length_without_exception_boilerplate < 30))
            AND message_format_string NOT IN known_short_messages
        GROUP BY message_format_string ORDER BY c DESC LIMIT 50 FORMAT TSVWithNamesAndTypes
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop short messages:\n")
    print(value)
    print("\n")

    query = """
        SELECT max((freq, message_format_string)), level
        FROM (SELECT count() / (SELECT count() FROM system.text_log
              WHERE (now() - toIntervalMinute(240)) < event_time) AS freq,
              min(level) AS level, message_format_string FROM system.text_log
              WHERE (now() - toIntervalMinute(120)) < event_time
              GROUP BY message_format_string ORDER BY freq DESC)
        GROUP BY level
    """
    value = clickhouse_execute(args, query).decode(errors="replace")
    print("\nTop messages by level:\n")
    print(value)
    print("\n")


def main(args):
    global server_died
    global stop_time
    global exit_code
    global server_logs_level
    global restarted_tests

    if not check_server_started(args):
        msg = "Server is not responding. Cannot execute 'SELECT 1' query."
        if args.hung_check:
            print(msg)
            pid = get_server_pid()
            print("Got server pid", pid)
            print_stacktraces()
        raise Exception(msg)

    args.build_flags = collect_build_flags(args)
    args.changed_merge_tree_settings = collect_changed_merge_tree_settings(args)
    args.suppport_system_processes_is_all_data_sent = check_table_column(
        args, "system", "processes", "is_all_data_sent"
    )

    if args.s3_storage and (
        BuildFlags.THREAD in args.build_flags or BuildFlags.DEBUG in args.build_flags
    ):
        args.no_random_settings = True

    if args.skip:
        args.skip = set(args.skip)

    base_dir = os.path.abspath(args.queries)

    # Keep same default values as in queries/shell_config.sh
    os.environ.setdefault("CLICKHOUSE_BINARY", args.binary)
    # os.environ.setdefault("CLICKHOUSE_CLIENT", args.client)
    os.environ.setdefault("CLICKHOUSE_CONFIG", args.configserver)

    if args.configclient:
        os.environ.setdefault("CLICKHOUSE_CONFIG_CLIENT", args.configclient)

    # Force to print server warnings in stderr
    # Shell scripts could change logging level
    os.environ.setdefault("CLICKHOUSE_CLIENT_SERVER_LOGS_LEVEL", server_logs_level)

    # This code is bad as the time is not monotonic
    if args.global_time_limit:
        stop_time = time() + args.global_time_limit

    if args.zookeeper is None:
        args.zookeeper = True

    if args.shard is None:
        args.shard = bool(extract_key(' --key listen_host | grep -E "127.0.0.2|::"'))

    def create_common_database(args, db_name):
        create_database_retries = 0
        while create_database_retries < MAX_RETRIES:
            start_time = datetime.now()
            try:
                clickhouse_execute(
                    args,
                    f"CREATE DATABASE IF NOT EXISTS {db_name} "
                    f"{get_db_engine(args, db_name)}",
                    settings=get_create_database_settings(args, None),
                )
            except HTTPError as e:
                total_time = (datetime.now() - start_time).total_seconds()
                if not need_retry(args, e.message, e.message, total_time):
                    break
            create_database_retries += 1

    try:
        if args.database and args.database != "test":
            create_common_database(args, args.database)

        create_common_database(args, "test")
    except Exception as e:
        print(f"Failed to create databases for tests: {e}")
        server_died.set()

    if BuildFlags.SANITIZE_COVERAGE in args.build_flags:
        clickhouse_execute(
            args,
            """
                CREATE TABLE IF NOT EXISTS system.coverage
                (
                    test_name String,
                    coverage Array(UInt64)
                ) ENGINE = MergeTree ORDER BY test_name;
            """,
        )

    total_tests_run = 0

    for suite in sorted(os.listdir(base_dir), key=suite_key_func):
        if server_died.is_set():
            break

        test_suite = TestSuite.read_test_suite(args, suite)
        if test_suite is None:
            continue

        total_tests_run += do_run_tests(args.jobs, test_suite, args.parallel)

    if server_died.is_set():
        exit_code.value = 1

    if args.hung_check:
        # Some queries may execute in background for some time after test was finished. This is normal.
        for _ in range(1, 60):
            processlist = get_processlist_with_stacktraces(args)
            if not processlist:
                break
            sleep(1)

        if processlist:
            print(
                colored(
                    "\nFound hung queries in processlist:", args, "red", attrs=["bold"]
                )
            )
            print(processlist.decode())
            print(get_transactions_list(args))

            print_stacktraces()
            exit_code.value = 1
        else:
            print(colored("\nNo queries hung.", args, "green", attrs=["bold"]))

    if len(restarted_tests) > 0:
        print("\nSome tests were restarted:\n")

        for test_result in restarted_tests:
            print(f"\n{test_result.case_name:72}: ")
            # replace it with lowercase to avoid parsing retried tests as failed
            for status in TestStatus:
                test_result.description = test_result.description.replace(
                    status.value, status.value.lower()
                )
            print(test_result.description)

    if total_tests_run == 0:
        print("No tests were run.")
        sys.exit(1)
    else:
        print("All tests have finished.")

    if args.report_logs_stats:
        try:
            reportLogStats(args)
        except Exception as e:
            print(f"Failed to get stats about log messages: {e}")

    if args.report_coverage and not reportCoverage(args):
        exit_code.value = 1

    sys.exit(exit_code.value)


def find_binary(name):
    if os.access(name, os.X_OK):
        return name
    paths = os.environ.get("PATH").split(":")
    for path in paths:
        bin_path = os.path.join(path, name)
        if os.access(bin_path, os.X_OK):
            return bin_path

    # maybe it wasn't in PATH
    bin_path = os.path.join("/usr/local/bin", name)
    if os.access(bin_path, os.X_OK):
        return bin_path
    bin_path = os.path.join("/usr/bin", name)
    if os.access(bin_path, os.X_OK):
        return bin_path

    raise Exception(f"{name} was not found in PATH")


def find_clickhouse_command(binary, command):
    symlink = binary + "-" + command
    if os.access(symlink, os.X_OK):
        return symlink

    # To avoid requiring symlinks (in case you download binary from CI)
    return binary + " " + command


def get_additional_client_options(args):
    if args.client_option:
        return " ".join("--" + option for option in args.client_option)
    return ""


def get_additional_client_options_url(args):
    if args.client_option:
        return "&".join(args.client_option)
    return ""


def parse_args():
    parser = ArgumentParser(description="ClickHouse functional tests")
    parser.add_argument("-q", "--queries", help="Path to queries dir")
    parser.add_argument("--tmp", help="Path to tmp dir")

    parser.add_argument(
        "-b",
        "--binary",
        default="clickhouse",
        type=find_binary,
        help="Path to clickhouse binary or name of binary in PATH",
    )
    parser.add_argument(
        "-c",
        "--client",
        help="Path to clickhouse-client, this option is useless"
        "name of binary in PATH",
    )

    parser.add_argument("--extract_from_config", help="extract-from-config program")
    parser.add_argument(
        "--configclient", help="Client config (if you use not default ports)"
    )
    parser.add_argument(
        "--configserver",
        default="/etc/clickhouse-server/config.xml",
        help="Preprocessed server config",
    )
    parser.add_argument(
        "-o", "--output", help="Output xUnit compliant test report directory"
    )
    parser.add_argument(
        "-t",
        "--timeout",
        type=int,
        default=600,
        help="Timeout for each test case in seconds",
    )
    parser.add_argument(
        "--global_time_limit",
        type=int,
        help="Stop if executing more than specified time (after current test finished)",
    )
    parser.add_argument("test", nargs="*", help="Optional test case name regex")
    parser.add_argument(
        "-d",
        "--disabled",
        action="store_true",
        default=False,
        help="Also run disabled tests",
    )
    parser.add_argument(
        "--stop",
        action="store_true",
        default=None,
        dest="stop",
        help="Stop on network errors",
    )
    parser.add_argument(
        "--order", default="desc", choices=["asc", "desc", "random"], help="Run order"
    )
    parser.add_argument(
        "--testname",
        action="store_true",
        default=None,
        dest="testname",
        help="Make query with test name before test run",
    )
    parser.add_argument("--hung-check", action="store_true", default=False)
    parser.add_argument("--no-left-queries-check", action="store_true", default=False)
    parser.add_argument("--force-color", action="store_true", default=False)
    parser.add_argument(
        "--database", help="Database for tests (random name test_XXXXXX by default)"
    )
    parser.add_argument(
        "--no-drop-if-fail",
        action="store_true",
        help="Do not drop database for test if test has failed",
    )
    parser.add_argument(
        "--hide-db-name",
        action="store_true",
        help='Replace random database name with "default" in stderr',
    )
    parser.add_argument(
        "--parallel", default="1/1", help="One parallel test run number/total"
    )
    parser.add_argument(
        "-j", "--jobs", default=1, nargs="?", type=int, help="Run all tests in parallel"
    )
    parser.add_argument(
        "--test-runs",
        default=1,
        nargs="?",
        type=int,
        help="Run each test many times (useful for e.g. flaky check)",
    )
    parser.add_argument(
        "-U",
        "--unified",
        default=3,
        type=int,
        help="output NUM lines of unified context",
    )
    parser.add_argument(
        "-r",
        "--server-check-retries",
        default=180,
        type=int,
        help="Num of tries to execute SELECT 1 before tests started",
    )
    parser.add_argument("--db-engine", help="Database engine name")
    parser.add_argument(
        "--replicated-database",
        action="store_true",
        default=False,
        help="Run tests with Replicated database engine",
    )
    parser.add_argument(
        "--fast-tests-only",
        action="store_true",
        default=False,
        help='Run only fast tests (the tests without the "no-fasttest" tag)',
    )
    parser.add_argument(
        "--no-stateless", action="store_true", help="Disable all stateless tests"
    )
    parser.add_argument(
        "--no-stateful", action="store_true", help="Disable all stateful tests"
    )
    parser.add_argument("--skip", nargs="+", help="Skip these tests")
    parser.add_argument(
        "--sequential",
        nargs="+",
        help="Run these tests sequentially even if --parallel specified",
    )
    parser.add_argument(
        "--no-long", action="store_true", dest="no_long", help="Do not run long tests"
    )
    parser.add_argument(
        "--client-option", nargs="+", help="Specify additional client argument"
    )
    parser.add_argument(
        "--print-time", action="store_true", dest="print_time", help="Print test time"
    )
    parser.add_argument(
        "--check-zookeeper-session",
        action="store_true",
        help="Check ZooKeeper session uptime to determine if failed test should be retried",
    )
    parser.add_argument(
        "--s3-storage",
        action="store_true",
        default=False,
        help="Run tests over s3 storage",
    )
    parser.add_argument(
        "--no-random-settings",
        action="store_true",
        default=False,
        help="Disable settings randomization",
    )
    parser.add_argument(
        "--no-random-merge-tree-settings",
        action="store_true",
        default=False,
        help="Disable MergeTree settings randomization",
    )
    parser.add_argument(
        "--run-by-hash-num",
        type=int,
        help="Run tests matching crc32(test_name) % run_by_hash_total == run_by_hash_num",
    )
    parser.add_argument(
        "--run-by-hash-total",
        type=int,
        help="Total test groups for crc32(test_name) % run_by_hash_total == run_by_hash_num",
    )

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--zookeeper",
        action="store_true",
        default=None,
        dest="zookeeper",
        help="Run zookeeper related tests",
    )
    group.add_argument(
        "--no-zookeeper",
        action="store_false",
        default=None,
        dest="zookeeper",
        help="Do not run zookeeper related tests",
    )

    group = parser.add_mutually_exclusive_group(required=False)
    group.add_argument(
        "--shard",
        action="store_true",
        default=None,
        dest="shard",
        help="Run sharding related tests "
        "(required to clickhouse-server listen 127.0.0.2 127.0.0.3)",
    )
    group.add_argument(
        "--no-shard",
        action="store_false",
        default=None,
        dest="shard",
        help="Do not run shard related tests",
    )

    group.add_argument(
        "--upgrade-check",
        action="store_true",
        help="Run tests for further server upgrade testing by ignoring all"
        "drop queries in tests for collecting data from new version of server",
    )
    parser.add_argument(
        "--secure",
        action="store_true",
        default=False,
        help="Use secure connection to connect to clickhouse-server",
    )
    parser.add_argument(
        "--max-failures-chain",
        default=20,
        type=int,
        help="Max number of failed tests in a row (stop tests if higher)",
    )
    parser.add_argument(
        "--report-coverage",
        action="store_true",
        default=False,
        help="Check what high-level server components were covered by tests",
    )
    parser.add_argument(
        "--report-logs-stats",
        action="store_true",
        default=False,
        help="Report statistics about log messages",
    )
    parser.add_argument(
        "--no-parallel-replicas",
        action="store_true",
        default=False,
        help="Do not include tests that are not supported with parallel replicas feature",
    )

    return parser.parse_args()


if __name__ == "__main__":
    stop_time = None
    exit_code = multiprocessing.Value("i", 0)
    server_died = multiprocessing.Event()
    stop_tests_triggered_lock = multiprocessing.Lock()
    stop_tests_triggered = multiprocessing.Event()
    queue = multiprocessing.Queue(maxsize=1)
    multiprocessing_manager = multiprocessing.Manager()
    restarted_tests = multiprocessing_manager.list()

    # Move to a new process group and kill it at exit so that we don't have any
    # infinite tests processes left
    # (new process group is required to avoid killing some parent processes)
    os.setpgid(0, 0)
    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)
    signal.signal(signal.SIGHUP, signal_handler)

    try:
        args = parse_args()
    except Exception as e:
        print(e, file=sys.stderr)
        sys.exit(1)

    if args.queries and not os.path.isdir(args.queries):
        print(
            f"Cannot access the specified directory with queries ({args.queries})",
            file=sys.stderr,
        )
        sys.exit(1)

    # Autodetect the directory with queries if not specified
    if args.queries is None:
        args.queries = "queries"

    if not os.path.isdir(args.queries):
        # If we're running from the repo
        args.queries = os.path.join(
            os.path.dirname(os.path.abspath(__file__)), "queries"
        )

    if not os.path.isdir(args.queries):
        # Next we're going to try some system directories, don't write 'stdout' files into them.
        if args.tmp is None:
            args.tmp = "/tmp/clickhouse-test"

        args.queries = "/usr/local/share/clickhouse-test/queries"

    if not os.path.isdir(args.queries):
        args.queries = "/usr/share/clickhouse-test/queries"

    if not os.path.isdir(args.queries):
        print(
            "Failed to detect path to the queries directory. Please specify it with "
            "'--queries' option.",
            file=sys.stderr,
        )
        sys.exit(1)

    print("Using queries from '" + args.queries + "' directory")

    if args.tmp is None:
        args.tmp = args.queries

    if args.client:
        print(
            "WARNING: --client option is deprecated and will be removed the the future, use --binary instead",
            file=sys.stderr,
        )

    args.client = find_clickhouse_command(args.binary, "client")

    if args.extract_from_config:
        print(
            "WARNING: --extract_from_config option is deprecated and will be removed the the future",
            file=sys.stderr,
        )
    args.extract_from_config = find_clickhouse_command(
        args.binary, "extract-from-config"
    )

    if args.configclient:
        args.client += " --config-file=" + args.configclient

    tcp_host = os.getenv("CLICKHOUSE_HOST")
    if tcp_host is not None:
        args.tcp_host = tcp_host
        args.client += f" --host={tcp_host}"
    else:
        args.tcp_host = "localhost"

    tcp_port = os.getenv("CLICKHOUSE_PORT_TCP")
    if tcp_port is not None:
        args.tcp_port = int(tcp_port)
        args.client += f" --port={tcp_port}"
    else:
        args.tcp_port = 9440 if args.secure else 9000
        if args.secure:
            os.environ["CLICKHOUSE_PORT_TCP"] = str(args.tcp_port)

    http_port = os.getenv("CLICKHOUSE_PORT_HTTP")
    if http_port is not None:
        args.http_port = int(http_port)
    else:
        args.http_port = 8443 if args.secure else 8123
        os.environ["CLICKHOUSE_PORT_HTTP"] = str(args.http_port)
        if args.secure and os.getenv("CLICKHOUSE_PORT_HTTP_PROTO") is None:
            os.environ["CLICKHOUSE_PORT_HTTP_PROTO"] = "https"

    client_database = os.getenv("CLICKHOUSE_DATABASE")
    if client_database is not None:
        args.client += f" --database={client_database}"
        args.client_database = client_database
    else:
        args.client_database = "default"

    if args.upgrade_check:
        args.client += " --fake-drop"

    if args.client_option or args.secure:
        # Set options for client
        if "CLICKHOUSE_CLIENT_OPT" in os.environ:
            os.environ["CLICKHOUSE_CLIENT_OPT"] += " "
        else:
            os.environ["CLICKHOUSE_CLIENT_OPT"] = ""

        os.environ["CLICKHOUSE_CLIENT_OPT"] += get_additional_client_options(args)
        if args.secure:
            os.environ["CLICKHOUSE_CLIENT_OPT"] += " --secure "

        # Set options for curl
        if "CLICKHOUSE_URL_PARAMS" in os.environ:
            os.environ["CLICKHOUSE_URL_PARAMS"] += "&"
        else:
            os.environ["CLICKHOUSE_URL_PARAMS"] = ""

        client_options_query_str = get_additional_client_options_url(args)
        args.client_options_query_str = client_options_query_str + "&"
        os.environ["CLICKHOUSE_URL_PARAMS"] += client_options_query_str
    else:
        args.client_options_query_str = ""

    if args.jobs is None:
        args.jobs = multiprocessing.cpu_count()

    if args.db_engine and args.db_engine == "Ordinary":
        MESSAGES_TO_RETRY.append(" locking attempt on ")

    main(args)