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ClickHouse/dbms/programs/server/Server.cpp

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#include "Server.h"
#include <memory>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <pwd.h>
#include <unistd.h>
#include <Poco/Version.h>
#include <Poco/DirectoryIterator.h>
#include <Poco/Net/HTTPServer.h>
#include <Poco/Net/NetException.h>
#include <ext/scope_guard.h>
#include <common/logger_useful.h>
#include <common/ErrorHandlers.h>
#include <common/getMemoryAmount.h>
#include <Common/ClickHouseRevision.h>
#include <Common/DNSResolver.h>
#include <Common/CurrentMetrics.h>
#include <Common/Macros.h>
#include <Common/StringUtils/StringUtils.h>
#include <Common/ZooKeeper/ZooKeeper.h>
#include <Common/ZooKeeper/ZooKeeperNodeCache.h>
#include <Common/config.h>
#include <Common/getFQDNOrHostName.h>
#include <Common/getMultipleKeysFromConfig.h>
#include <Common/getNumberOfPhysicalCPUCores.h>
#include <Common/TaskStatsInfoGetter.h>
#include <Common/ThreadStatus.h>
#include <IO/HTTPCommon.h>
#include <IO/UseSSL.h>
#include <Interpreters/AsynchronousMetrics.h>
#include <Interpreters/DDLWorker.h>
#include <Interpreters/ProcessList.h>
#include <Interpreters/loadMetadata.h>
#include <Interpreters/DNSCacheUpdater.h>
#include <Storages/StorageReplicatedMergeTree.h>
#include <Storages/System/attachSystemTables.h>
#include <AggregateFunctions/registerAggregateFunctions.h>
#include <Functions/registerFunctions.h>
#include <TableFunctions/registerTableFunctions.h>
#include <Storages/registerStorages.h>
#include <Dictionaries/registerDictionaries.h>
#include <Common/Config/ConfigReloader.h>
#include "HTTPHandlerFactory.h"
#include "MetricsTransmitter.h"
#include <Common/StatusFile.h>
#include "TCPHandlerFactory.h"
#if defined(__linux__)
#include <Common/hasLinuxCapability.h>
#include <sys/mman.h>
#endif
#if USE_POCO_NETSSL
#include <Poco/Net/Context.h>
#include <Poco/Net/SecureServerSocket.h>
#endif
namespace CurrentMetrics
{
extern const Metric Revision;
extern const Metric VersionInteger;
}
namespace DB
{
namespace ErrorCodes
{
extern const int NO_ELEMENTS_IN_CONFIG;
extern const int SUPPORT_IS_DISABLED;
extern const int ARGUMENT_OUT_OF_BOUND;
extern const int EXCESSIVE_ELEMENT_IN_CONFIG;
extern const int INVALID_CONFIG_PARAMETER;
extern const int SYSTEM_ERROR;
extern const int FAILED_TO_GETPWUID;
extern const int MISMATCHING_USERS_FOR_PROCESS_AND_DATA;
}
static std::string getCanonicalPath(std::string && path)
{
Poco::trimInPlace(path);
if (path.empty())
throw Exception("path configuration parameter is empty", ErrorCodes::INVALID_CONFIG_PARAMETER);
if (path.back() != '/')
path += '/';
return std::move(path);
}
static std::string getUserName(uid_t user_id)
{
/// Try to convert user id into user name.
auto buffer_size = sysconf(_SC_GETPW_R_SIZE_MAX);
if (buffer_size <= 0)
buffer_size = 1024;
std::string buffer;
buffer.reserve(buffer_size);
struct passwd passwd_entry;
struct passwd * result = nullptr;
const auto error = getpwuid_r(user_id, &passwd_entry, buffer.data(), buffer_size, &result);
if (error)
throwFromErrno("Failed to find user name for " + toString(user_id), ErrorCodes::FAILED_TO_GETPWUID, error);
else if (result)
return result->pw_name;
return toString(user_id);
}
void Server::uninitialize()
{
logger().information("shutting down");
BaseDaemon::uninitialize();
}
void Server::initialize(Poco::Util::Application & self)
{
BaseDaemon::initialize(self);
logger().information("starting up");
}
std::string Server::getDefaultCorePath() const
{
return getCanonicalPath(config().getString("path", DBMS_DEFAULT_PATH)) + "cores";
}
int Server::main(const std::vector<std::string> & /*args*/)
{
Logger * log = &logger();
UseSSL use_ssl;
ThreadStatus thread_status;
registerFunctions();
registerAggregateFunctions();
registerTableFunctions();
registerStorages();
registerDictionaries();
CurrentMetrics::set(CurrentMetrics::Revision, ClickHouseRevision::get());
CurrentMetrics::set(CurrentMetrics::VersionInteger, ClickHouseRevision::getVersionInteger());
/** Context contains all that query execution is dependent:
* settings, available functions, data types, aggregate functions, databases...
*/
global_context = std::make_unique<Context>(Context::createGlobal());
global_context->setGlobalContext(*global_context);
global_context->setApplicationType(Context::ApplicationType::SERVER);
bool has_zookeeper = config().has("zookeeper");
zkutil::ZooKeeperNodeCache main_config_zk_node_cache([&] { return global_context->getZooKeeper(); });
zkutil::EventPtr main_config_zk_changed_event = std::make_shared<Poco::Event>();
if (loaded_config.has_zk_includes)
{
auto old_configuration = loaded_config.configuration;
ConfigProcessor config_processor(config_path);
loaded_config = config_processor.loadConfigWithZooKeeperIncludes(
main_config_zk_node_cache, main_config_zk_changed_event, /* fallback_to_preprocessed = */ true);
config_processor.savePreprocessedConfig(loaded_config, config().getString("path", DBMS_DEFAULT_PATH));
config().removeConfiguration(old_configuration.get());
config().add(loaded_config.configuration.duplicate(), PRIO_DEFAULT, false);
}
const auto memory_amount = getMemoryAmount();
#if defined(__linux__)
/// After full config loaded
{
if (config().getBool("mlock_executable", false))
{
if (hasLinuxCapability(CAP_IPC_LOCK))
{
LOG_TRACE(log, "Will mlockall to prevent executable memory from being paged out. It may take a few seconds.");
if (0 != mlockall(MCL_CURRENT))
LOG_WARNING(log, "Failed mlockall: " + errnoToString(ErrorCodes::SYSTEM_ERROR));
else
LOG_TRACE(log, "The memory map of clickhouse executable has been mlock'ed");
}
else
{
LOG_INFO(log, "It looks like the process has no CAP_IPC_LOCK capability, binary mlock will be disabled."
" It could happen due to incorrect ClickHouse package installation."
" You could resolve the problem manually with 'sudo setcap cap_ipc_lock=+ep /usr/bin/clickhouse'."
" Note that it will not work on 'nosuid' mounted filesystems.");
}
}
}
#endif
std::string path = getCanonicalPath(config().getString("path", DBMS_DEFAULT_PATH));
std::string default_database = config().getString("default_database", "default");
/// Check that the process' user id matches the owner of the data.
const auto effective_user_id = geteuid();
struct stat statbuf;
if (stat(path.c_str(), &statbuf) == 0 && effective_user_id != statbuf.st_uid)
{
const auto effective_user = getUserName(effective_user_id);
const auto data_owner = getUserName(statbuf.st_uid);
std::string message = "Effective user of the process (" + effective_user +
") does not match the owner of the data (" + data_owner + ").";
if (effective_user_id == 0)
{
message += " Run under 'sudo -u " + data_owner + "'.";
throw Exception(message, ErrorCodes::MISMATCHING_USERS_FOR_PROCESS_AND_DATA);
}
else
{
LOG_WARNING(log, message);
}
}
global_context->setPath(path);
/// Create directories for 'path' and for default database, if not exist.
Poco::File(path + "data/" + default_database).createDirectories();
Poco::File(path + "metadata/" + default_database).createDirectories();
StatusFile status{path + "status"};
SCOPE_EXIT({
/** Explicitly destroy Context. It is more convenient than in destructor of Server, because logger is still available.
* At this moment, no one could own shared part of Context.
*/
global_context.reset();
LOG_DEBUG(log, "Destroyed global context.");
});
/// Try to increase limit on number of open files.
{
rlimit rlim;
if (getrlimit(RLIMIT_NOFILE, &rlim))
throw Poco::Exception("Cannot getrlimit");
if (rlim.rlim_cur == rlim.rlim_max)
{
LOG_DEBUG(log, "rlimit on number of file descriptors is " << rlim.rlim_cur);
}
else
{
rlim_t old = rlim.rlim_cur;
rlim.rlim_cur = config().getUInt("max_open_files", rlim.rlim_max);
int rc = setrlimit(RLIMIT_NOFILE, &rlim);
if (rc != 0)
LOG_WARNING(log,
"Cannot set max number of file descriptors to " << rlim.rlim_cur
<< ". Try to specify max_open_files according to your system limits. error: "
<< strerror(errno));
else
LOG_DEBUG(log, "Set max number of file descriptors to " << rlim.rlim_cur << " (was " << old << ").");
}
}
static ServerErrorHandler error_handler;
Poco::ErrorHandler::set(&error_handler);
/// Initialize DateLUT early, to not interfere with running time of first query.
LOG_DEBUG(log, "Initializing DateLUT.");
DateLUT::instance();
LOG_TRACE(log, "Initialized DateLUT with time zone `" << DateLUT::instance().getTimeZone() << "'.");
/// Directory with temporary data for processing of heavy queries.
{
std::string tmp_path = config().getString("tmp_path", path + "tmp/");
global_context->setTemporaryPath(tmp_path);
Poco::File(tmp_path).createDirectories();
/// Clearing old temporary files.
Poco::DirectoryIterator dir_end;
for (Poco::DirectoryIterator it(tmp_path); it != dir_end; ++it)
{
if (it->isFile() && startsWith(it.name(), "tmp"))
{
LOG_DEBUG(log, "Removing old temporary file " << it->path());
it->remove();
}
}
}
/** Directory with 'flags': files indicating temporary settings for the server set by system administrator.
* Flags may be cleared automatically after being applied by the server.
* Examples: do repair of local data; clone all replicated tables from replica.
*/
{
Poco::File(path + "flags/").createDirectories();
global_context->setFlagsPath(path + "flags/");
}
/** Directory with user provided files that are usable by 'file' table function.
*/
{
std::string user_files_path = config().getString("user_files_path", path + "user_files/");
global_context->setUserFilesPath(user_files_path);
Poco::File(user_files_path).createDirectories();
}
if (config().has("interserver_http_port") && config().has("interserver_https_port"))
throw Exception("Both http and https interserver ports are specified", ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG);
static const auto interserver_tags =
{
std::make_tuple("interserver_http_host", "interserver_http_port", "http"),
std::make_tuple("interserver_https_host", "interserver_https_port", "https")
};
for (auto [host_tag, port_tag, scheme] : interserver_tags)
{
if (config().has(port_tag))
{
String this_host = config().getString(host_tag, "");
if (this_host.empty())
{
this_host = getFQDNOrHostName();
LOG_DEBUG(log,
"Configuration parameter '" + String(host_tag) + "' doesn't exist or exists and empty. Will use '" + this_host
+ "' as replica host.");
}
String port_str = config().getString(port_tag);
int port = parse<int>(port_str);
if (port < 0 || port > 0xFFFF)
throw Exception("Out of range '" + String(port_tag) + "': " + toString(port), ErrorCodes::ARGUMENT_OUT_OF_BOUND);
global_context->setInterserverIOAddress(this_host, port);
global_context->setInterserverScheme(scheme);
}
}
if (config().has("interserver_http_credentials"))
{
String user = config().getString("interserver_http_credentials.user", "");
String password = config().getString("interserver_http_credentials.password", "");
if (user.empty())
throw Exception("Configuration parameter interserver_http_credentials user can't be empty", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
global_context->setInterserverCredentials(user, password);
}
if (config().has("macros"))
global_context->setMacros(std::make_unique<Macros>(config(), "macros"));
/// Initialize main config reloader.
std::string include_from_path = config().getString("include_from", "/etc/metrika.xml");
auto main_config_reloader = std::make_unique<ConfigReloader>(config_path,
include_from_path,
config().getString("path", ""),
std::move(main_config_zk_node_cache),
main_config_zk_changed_event,
[&](ConfigurationPtr config)
{
buildLoggers(*config);
global_context->setClustersConfig(config);
global_context->setMacros(std::make_unique<Macros>(*config, "macros"));
},
/* already_loaded = */ true);
/// Initialize users config reloader.
std::string users_config_path = config().getString("users_config", config_path);
/// If path to users' config isn't absolute, try guess its root (current) dir.
/// At first, try to find it in dir of main config, after will use current dir.
if (users_config_path.empty() || users_config_path[0] != '/')
{
std::string config_dir = Poco::Path(config_path).parent().toString();
if (Poco::File(config_dir + users_config_path).exists())
users_config_path = config_dir + users_config_path;
}
auto users_config_reloader = std::make_unique<ConfigReloader>(users_config_path,
include_from_path,
config().getString("path", ""),
zkutil::ZooKeeperNodeCache([&] { return global_context->getZooKeeper(); }),
std::make_shared<Poco::Event>(),
[&](ConfigurationPtr config) { global_context->setUsersConfig(config); },
/* already_loaded = */ false);
/// Reload config in SYSTEM RELOAD CONFIG query.
global_context->setConfigReloadCallback([&]()
{
main_config_reloader->reload();
users_config_reloader->reload();
});
/// Limit on total number of concurrently executed queries.
global_context->getProcessList().setMaxSize(config().getInt("max_concurrent_queries", 0));
/// Setup protection to avoid accidental DROP for big tables (that are greater than 50 GB by default)
if (config().has("max_table_size_to_drop"))
global_context->setMaxTableSizeToDrop(config().getUInt64("max_table_size_to_drop"));
if (config().has("max_partition_size_to_drop"))
global_context->setMaxPartitionSizeToDrop(config().getUInt64("max_partition_size_to_drop"));
/// Size of cache for uncompressed blocks. Zero means disabled.
size_t uncompressed_cache_size = config().getUInt64("uncompressed_cache_size", 0);
if (uncompressed_cache_size)
global_context->setUncompressedCache(uncompressed_cache_size);
/// Load global settings from default_profile and system_profile.
global_context->setDefaultProfiles(config());
Settings & settings = global_context->getSettingsRef();
/// Size of cache for marks (index of MergeTree family of tables). It is necessary.
size_t mark_cache_size = config().getUInt64("mark_cache_size");
if (mark_cache_size)
global_context->setMarkCache(mark_cache_size);
#if USE_EMBEDDED_COMPILER
size_t compiled_expression_cache_size = config().getUInt64("compiled_expression_cache_size", 500);
if (compiled_expression_cache_size)
global_context->setCompiledExpressionCache(compiled_expression_cache_size);
#endif
/// Set path for format schema files
auto format_schema_path = Poco::File(config().getString("format_schema_path", path + "format_schemas/"));
global_context->setFormatSchemaPath(format_schema_path.path());
format_schema_path.createDirectories();
LOG_INFO(log, "Loading metadata.");
try
{
loadMetadataSystem(*global_context);
/// After attaching system databases we can initialize system log.
global_context->initializeSystemLogs();
/// After the system database is created, attach virtual system tables (in addition to query_log and part_log)
attachSystemTablesServer(*global_context->getDatabase("system"), has_zookeeper);
/// Then, load remaining databases
loadMetadata(*global_context);
}
catch (...)
{
tryLogCurrentException(log, "Caught exception while loading metadata");
throw;
}
LOG_DEBUG(log, "Loaded metadata.");
global_context->setCurrentDatabase(default_database);
SCOPE_EXIT({
/** Ask to cancel background jobs all table engines,
* and also query_log.
* It is important to do early, not in destructor of Context, because
* table engines could use Context on destroy.
*/
LOG_INFO(log, "Shutting down storages.");
global_context->shutdown();
LOG_DEBUG(log, "Shutted down storages.");
});
if (has_zookeeper && config().has("distributed_ddl"))
{
/// DDL worker should be started after all tables were loaded
String ddl_zookeeper_path = config().getString("distributed_ddl.path", "/clickhouse/task_queue/ddl/");
global_context->setDDLWorker(std::make_shared<DDLWorker>(ddl_zookeeper_path, *global_context, &config(), "distributed_ddl"));
}
std::unique_ptr<DNSCacheUpdater> dns_cache_updater;
if (config().has("disable_internal_dns_cache") && config().getInt("disable_internal_dns_cache"))
{
/// Disable DNS caching at all
DNSResolver::instance().setDisableCacheFlag();
}
else
{
/// Initialize a watcher updating DNS cache in case of network errors
dns_cache_updater = std::make_unique<DNSCacheUpdater>(*global_context);
}
#if defined(__linux__)
if (!TaskStatsInfoGetter::checkPermissions())
{
LOG_INFO(log, "It looks like the process has no CAP_NET_ADMIN capability, 'taskstats' performance statistics will be disabled."
" It could happen due to incorrect ClickHouse package installation."
" You could resolve the problem manually with 'sudo setcap cap_net_admin=+ep /usr/bin/clickhouse'."
" Note that it will not work on 'nosuid' mounted filesystems."
" It also doesn't work if you run clickhouse-server inside network namespace as it happens in some containers.");
}
#else
LOG_INFO(log, "TaskStats is not implemented for this OS. IO accounting will be disabled.");
#endif
{
Poco::Timespan keep_alive_timeout(config().getUInt("keep_alive_timeout", 10), 0);
Poco::ThreadPool server_pool(3, config().getUInt("max_connections", 1024));
Poco::Net::HTTPServerParams::Ptr http_params = new Poco::Net::HTTPServerParams;
http_params->setTimeout(settings.http_receive_timeout);
http_params->setKeepAliveTimeout(keep_alive_timeout);
std::vector<std::unique_ptr<Poco::Net::TCPServer>> servers;
std::vector<std::string> listen_hosts = DB::getMultipleValuesFromConfig(config(), "", "listen_host");
bool listen_try = config().getBool("listen_try", false);
if (listen_hosts.empty())
{
listen_hosts.emplace_back("::1");
listen_hosts.emplace_back("127.0.0.1");
listen_try = true;
}
auto make_socket_address = [&](const std::string & host, UInt16 port)
{
Poco::Net::SocketAddress socket_address;
try
{
socket_address = Poco::Net::SocketAddress(host, port);
}
catch (const Poco::Net::DNSException & e)
{
const auto code = e.code();
if (code == EAI_FAMILY
#if defined(EAI_ADDRFAMILY)
|| code == EAI_ADDRFAMILY
#endif
)
{
LOG_ERROR(log,
"Cannot resolve listen_host (" << host << "), error " << e.code() << ": " << e.message() << ". "
"If it is an IPv6 address and your host has disabled IPv6, then consider to "
"specify IPv4 address to listen in <listen_host> element of configuration "
"file. Example: <listen_host>0.0.0.0</listen_host>");
}
throw;
}
return socket_address;
};
auto socket_bind_listen = [&](auto & socket, const std::string & host, UInt16 port, bool secure = 0)
{
auto address = make_socket_address(host, port);
#if !POCO_CLICKHOUSE_PATCH || POCO_VERSION <= 0x02000000 // TODO: fill correct version
if (secure)
/// Bug in old poco, listen() after bind() with reusePort param will fail because have no implementation in SecureServerSocketImpl
/// https://github.com/pocoproject/poco/pull/2257
socket.bind(address, /* reuseAddress = */ true);
else
#endif
#if POCO_VERSION < 0x01080000
socket.bind(address, /* reuseAddress = */ true);
#else
socket.bind(address, /* reuseAddress = */ true, /* reusePort = */ config().getBool("listen_reuse_port", false));
#endif
socket.listen(/* backlog = */ config().getUInt("listen_backlog", 64));
return address;
};
for (const auto & listen_host : listen_hosts)
{
/// For testing purposes, user may omit tcp_port or http_port or https_port in configuration file.
try
{
/// HTTP
if (config().has("http_port"))
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("http_port"));
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
new HTTPHandlerFactory(*this, "HTTPHandler-factory"),
server_pool,
socket,
http_params));
LOG_INFO(log, "Listening http://" + address.toString());
}
/// HTTPS
if (config().has("https_port"))
{
#if USE_POCO_NETSSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("https_port"), /* secure = */ true);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
new HTTPHandlerFactory(*this, "HTTPSHandler-factory"),
server_pool,
socket,
http_params));
LOG_INFO(log, "Listening https://" + address.toString());
#else
throw Exception{"HTTPS protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
}
/// TCP
if (config().has("tcp_port"))
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("tcp_port"));
socket.setReceiveTimeout(settings.receive_timeout);
socket.setSendTimeout(settings.send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::TCPServer>(
new TCPHandlerFactory(*this),
server_pool,
socket,
new Poco::Net::TCPServerParams));
LOG_INFO(log, "Listening tcp: " + address.toString());
}
/// TCP with SSL
if (config().has("tcp_port_secure"))
{
#if USE_POCO_NETSSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("tcp_port_secure"), /* secure = */ true);
socket.setReceiveTimeout(settings.receive_timeout);
socket.setSendTimeout(settings.send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::TCPServer>(
new TCPHandlerFactory(*this, /* secure= */ true),
server_pool,
socket,
new Poco::Net::TCPServerParams));
LOG_INFO(log, "Listening tcp_secure: " + address.toString());
#else
throw Exception{"SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
}
/// At least one of TCP and HTTP servers must be created.
if (servers.empty())
throw Exception("No 'tcp_port' and 'http_port' is specified in configuration file.", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
/// Interserver IO HTTP
if (config().has("interserver_http_port"))
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("interserver_http_port"));
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
new InterserverIOHTTPHandlerFactory(*this, "InterserverIOHTTPHandler-factory"),
server_pool,
socket,
http_params));
LOG_INFO(log, "Listening interserver http: " + address.toString());
}
if (config().has("interserver_https_port"))
{
#if USE_POCO_NETSSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, config().getInt("interserver_https_port"), /* secure = */ true);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
new InterserverIOHTTPHandlerFactory(*this, "InterserverIOHTTPHandler-factory"),
server_pool,
socket,
http_params));
LOG_INFO(log, "Listening interserver https: " + address.toString());
#else
throw Exception{"SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
}
}
catch (const Poco::Net::NetException & e)
{
if (listen_try)
LOG_ERROR(log, "Listen [" << listen_host << "]: " << e.code() << ": " << e.what() << ": " << e.message()
<< " If it is an IPv6 or IPv4 address and your host has disabled IPv6 or IPv4, then consider to "
"specify not disabled IPv4 or IPv6 address to listen in <listen_host> element of configuration "
"file. Example for disabled IPv6: <listen_host>0.0.0.0</listen_host> ."
" Example for disabled IPv4: <listen_host>::</listen_host>");
else
throw;
}
}
if (servers.empty())
throw Exception("No servers started (add valid listen_host and 'tcp_port' or 'http_port' to configuration file.)", ErrorCodes::NO_ELEMENTS_IN_CONFIG);
for (auto & server : servers)
server->start();
main_config_reloader->start();
users_config_reloader->start();
{
std::stringstream message;
message << "Available RAM = " << formatReadableSizeWithBinarySuffix(memory_amount) << ";"
<< " physical cores = " << getNumberOfPhysicalCPUCores() << ";"
// on ARM processors it can show only enabled at current moment cores
<< " threads = " << std::thread::hardware_concurrency() << ".";
LOG_INFO(log, message.str());
}
LOG_INFO(log, "Ready for connections.");
SCOPE_EXIT({
LOG_DEBUG(log, "Received termination signal.");
LOG_DEBUG(log, "Waiting for current connections to close.");
is_cancelled = true;
int current_connections = 0;
for (auto & server : servers)
{
server->stop();
current_connections += server->currentConnections();
}
LOG_DEBUG(log,
"Closed all listening sockets."
<< (current_connections ? " Waiting for " + toString(current_connections) + " outstanding connections." : ""));
if (current_connections)
{
const int sleep_max_ms = 1000 * config().getInt("shutdown_wait_unfinished", 5);
const int sleep_one_ms = 100;
int sleep_current_ms = 0;
while (sleep_current_ms < sleep_max_ms)
{
current_connections = 0;
for (auto & server : servers)
current_connections += server->currentConnections();
if (!current_connections)
break;
sleep_current_ms += sleep_one_ms;
std::this_thread::sleep_for(std::chrono::milliseconds(sleep_one_ms));
}
}
LOG_DEBUG(
log, "Closed connections." << (current_connections ? " But " + toString(current_connections) + " remains."
" Tip: To increase wait time add to config: <shutdown_wait_unfinished>60</shutdown_wait_unfinished>" : ""));
main_config_reloader.reset();
users_config_reloader.reset();
});
/// try to load dictionaries immediately, throw on error and die
try
{
if (!config().getBool("dictionaries_lazy_load", true))
{
global_context->tryCreateEmbeddedDictionaries();
global_context->tryCreateExternalDictionaries();
}
}
catch (...)
{
LOG_ERROR(log, "Caught exception while loading dictionaries.");
throw;
}
/// This object will periodically calculate some metrics.
AsynchronousMetrics async_metrics(*global_context);
attachSystemTablesAsync(*global_context->getDatabase("system"), async_metrics);
std::vector<std::unique_ptr<MetricsTransmitter>> metrics_transmitters;
for (const auto & graphite_key : DB::getMultipleKeysFromConfig(config(), "", "graphite"))
{
metrics_transmitters.emplace_back(std::make_unique<MetricsTransmitter>(
*global_context, async_metrics, graphite_key));
}
SessionCleaner session_cleaner(*global_context);
waitForTerminationRequest();
}
return Application::EXIT_OK;
}
}
int mainEntryClickHouseServer(int argc, char ** argv)
{
DB::Server app;
try
{
return app.run(argc, argv);
}
catch (...)
{
std::cerr << DB::getCurrentExceptionMessage(true) << "\n";
auto code = DB::getCurrentExceptionCode();
return code ? code : 1;
}
}
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