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ClickHouse/programs/server/Server.cpp
Azat Khuzhin 72d7b6117e Use total_memory_tracker when there is no other MemoryTracker object. 
This should significantly reduce the MemoryTracking drift, test shows
that there is 0 drift after query storm (100 queries, via http/tcp/tcp
in one session).

TL;DR;

To track memory, clickhouse creates memory tracker object for each
thread **explicitly**, but until it is not created the memory
allocations are not under account.
There should not be lot of allocations w/o memory tracker, since most of
the time it is created early enough, but even this maybe enough to
trigger some problems.

Plus sometimes it is not possible to create it, for example some 3d
party library does not allow to do this explicitly:
- for example before #15740 allocations from librdkafka threads,
- or even worse, poco threads, they don't have any routines to do this.
This won't be a problem for `MemoryTracking` metric if the deallocation
will be done from the same thread w/o memory tracker (or vise versa),
but this is not always true.

NOTE, that this will slow down per-thread allocations w/o memory
tracker, since before this patch there were no memory tracking for them
while now they will be accounted in total_memory_tracker, and for
total_memory_tracker max_untracked_memory is always reached.
But this should not be significant.
2020-10-23 21:07:52 +03:00

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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 <Poco/Util/HelpFormatter.h>
#include <ext/scope_guard.h>
#include <common/logger_useful.h>
#include <common/phdr_cache.h>
#include <common/ErrorHandlers.h>
#include <common/getMemoryAmount.h>
#include <common/errnoToString.h>
#include <common/coverage.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/getFQDNOrHostName.h>
#include <Common/getMultipleKeysFromConfig.h>
#include <Common/getNumberOfPhysicalCPUCores.h>
#include <Common/getExecutablePath.h>
#include <Common/ThreadProfileEvents.h>
#include <Common/ThreadStatus.h>
#include <Common/getMappedArea.h>
#include <Common/remapExecutable.h>
#include <IO/HTTPCommon.h>
#include <IO/UseSSL.h>
#include <Interpreters/AsynchronousMetrics.h>
#include <Interpreters/DDLWorker.h>
#include <Interpreters/ExternalDictionariesLoader.h>
#include <Interpreters/ExternalModelsLoader.h>
#include <Interpreters/ProcessList.h>
#include <Interpreters/loadMetadata.h>
#include <Interpreters/DatabaseCatalog.h>
#include <Interpreters/DNSCacheUpdater.h>
#include <Interpreters/ExternalLoaderXMLConfigRepository.h>
#include <Access/AccessControlManager.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 <Disks/registerDisks.h>
#include <Common/Config/ConfigReloader.h>
#include <Server/HTTPHandlerFactory.h>
#include "MetricsTransmitter.h"
#include <Common/StatusFile.h>
#include <Server/TCPHandlerFactory.h>
#include <Common/SensitiveDataMasker.h>
#include <Common/ThreadFuzzer.h>
#include <Server/MySQLHandlerFactory.h>
#include <Server/PostgreSQLHandlerFactory.h>
#if !defined(ARCADIA_BUILD)
# include "config_core.h"
# include "Common/config_version.h"
# if USE_OPENCL
# include "Common/BitonicSort.h" // Y_IGNORE
# endif
#endif
#if defined(OS_LINUX)
# include <sys/mman.h>
# include <Common/hasLinuxCapability.h>
#endif
#if USE_SSL
# include <Poco/Net/Context.h>
# include <Poco/Net/SecureServerSocket.h>
#endif
namespace CurrentMetrics
{
extern const Metric Revision;
extern const Metric VersionInteger;
extern const Metric MemoryTracking;
}
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;
}
}
namespace
{
void setupTmpPath(Poco::Logger * log, const std::string & path)
{
LOG_DEBUG(log, "Setting up {} to store temporary data in it", path);
Poco::File(path).createDirectories();
/// Clearing old temporary files.
Poco::DirectoryIterator dir_end;
for (Poco::DirectoryIterator it(path); it != dir_end; ++it)
{
if (it->isFile() && startsWith(it.name(), "tmp"))
{
LOG_DEBUG(log, "Removing old temporary file {}", it->path());
it->remove();
}
else
LOG_DEBUG(log, "Skipped file in temporary path {}", it->path());
}
}
}
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;
extern const int NETWORK_ERROR;
}
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();
}
int Server::run()
{
if (config().hasOption("help"))
{
Poco::Util::HelpFormatter help_formatter(Server::options());
std::stringstream header;
header << commandName() << " [OPTION] [-- [ARG]...]\n";
header << "positional arguments can be used to rewrite config.xml properties, for example, --http_port=8010";
help_formatter.setHeader(header.str());
help_formatter.format(std::cout);
return 0;
}
if (config().hasOption("version"))
{
std::cout << DBMS_NAME << " server version " << VERSION_STRING << VERSION_OFFICIAL << "." << std::endl;
return 0;
}
return Application::run(); // NOLINT
}
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";
}
void Server::defineOptions(Poco::Util::OptionSet & options)
{
options.addOption(
Poco::Util::Option("help", "h", "show help and exit")
.required(false)
.repeatable(false)
.binding("help"));
options.addOption(
Poco::Util::Option("version", "V", "show version and exit")
.required(false)
.repeatable(false)
.binding("version"));
BaseDaemon::defineOptions(options);
}
void checkForUsersNotInMainConfig(
const Poco::Util::AbstractConfiguration & config,
const std::string & config_path,
const std::string & users_config_path,
Poco::Logger * log)
{
if (config.getBool("skip_check_for_incorrect_settings", false))
return;
if (config.has("users") || config.has("profiles") || config.has("quotas"))
{
/// We cannot throw exception here, because we have support for obsolete 'conf.d' directory
/// (that does not correspond to config.d or users.d) but substitute configuration to both of them.
LOG_ERROR(log, "The <users>, <profiles> and <quotas> elements should be located in users config file: {} not in main config {}."
" Also note that you should place configuration changes to the appropriate *.d directory like 'users.d'.",
users_config_path, config_path);
}
}
int Server::main(const std::vector<std::string> & /*args*/)
{
Poco::Logger * log = &logger();
UseSSL use_ssl;
MainThreadStatus::getInstance();
registerFunctions();
registerAggregateFunctions();
registerTableFunctions();
registerStorages();
registerDictionaries();
registerDisks();
CurrentMetrics::set(CurrentMetrics::Revision, ClickHouseRevision::getVersionRevision());
CurrentMetrics::set(CurrentMetrics::VersionInteger, ClickHouseRevision::getVersionInteger());
if (ThreadFuzzer::instance().isEffective())
LOG_WARNING(log, "ThreadFuzzer is enabled. Application will run slowly and unstable.");
#if !defined(NDEBUG) || !defined(__OPTIMIZE__)
LOG_WARNING(log, "Server was built in debug mode. It will work slowly.");
#endif
#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) || defined(MEMORY_SANITIZER)
LOG_WARNING(log, "Server was built with sanitizer. It will work slowly.");
#endif
/** Context contains all that query execution is dependent:
* settings, available functions, data types, aggregate functions, databases, ...
*/
auto shared_context = Context::createShared();
auto global_context = std::make_unique<Context>(Context::createGlobal(shared_context.get()));
global_context_ptr = global_context.get();
global_context->makeGlobalContext();
global_context->setApplicationType(Context::ApplicationType::SERVER);
// Initialize global thread pool. Do it before we fetch configs from zookeeper
// nodes (`from_zk`), because ZooKeeper interface uses the pool. We will
// ignore `max_thread_pool_size` in configs we fetch from ZK, but oh well.
GlobalThreadPool::initialize(config().getUInt("max_thread_pool_size", 10000));
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);
}
Settings::checkNoSettingNamesAtTopLevel(config(), config_path);
const auto memory_amount = getMemoryAmount();
#if defined(OS_LINUX)
std::string executable_path = getExecutablePath();
if (executable_path.empty())
executable_path = "/usr/bin/clickhouse"; /// It is used for information messages.
/// After full config loaded
{
if (config().getBool("remap_executable", false))
{
LOG_DEBUG(log, "Will remap executable in memory.");
remapExecutable();
LOG_DEBUG(log, "The code in memory has been successfully remapped.");
}
if (config().getBool("mlock_executable", false))
{
if (hasLinuxCapability(CAP_IPC_LOCK))
{
try
{
/// Get the memory area with (current) code segment.
/// It's better to lock only the code segment instead of calling "mlockall",
/// because otherwise debug info will be also locked in memory, and it can be huge.
auto [addr, len] = getMappedArea(reinterpret_cast<void *>(mainEntryClickHouseServer));
LOG_TRACE(log, "Will do mlock to prevent executable memory from being paged out. It may take a few seconds.");
if (0 != mlock(addr, len))
LOG_WARNING(log, "Failed mlock: {}", errnoToString(ErrorCodes::SYSTEM_ERROR));
else
LOG_TRACE(log, "The memory map of clickhouse executable has been mlock'ed, total {}", ReadableSize(len));
}
catch (...)
{
LOG_WARNING(log, "Cannot mlock: {}", getCurrentExceptionMessage(false));
}
}
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 {}'."
" Note that it will not work on 'nosuid' mounted filesystems.", executable_path);
}
}
}
#endif
global_context->setRemoteHostFilter(config());
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);
StatusFile status{path + "status", StatusFile::write_full_info};
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, "Shut down storages.");
/** 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_ptr = nullptr;
global_context.reset();
shared_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 {}. Try to specify max_open_files according to your system limits. error: {}", rlim.rlim_cur, strerror(errno));
else
LOG_DEBUG(log, "Set max number of file descriptors to {} (was {}).", rlim.rlim_cur, 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());
/// Storage with temporary data for processing of heavy queries.
{
std::string tmp_path = config().getString("tmp_path", path + "tmp/");
std::string tmp_policy = config().getString("tmp_policy", "");
const VolumePtr & volume = global_context->setTemporaryStorage(tmp_path, tmp_policy);
for (const DiskPtr & disk : volume->getDisks())
setupTmpPath(log, disk->getPath());
}
/** 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();
}
{
std::string dictionaries_lib_path = config().getString("dictionaries_lib_path", path + "dictionaries_lib/");
global_context->setDictionariesLibPath(dictionaries_lib_path);
Poco::File(dictionaries_lib_path).createDirectories();
}
{
Poco::File(path + "data/").createDirectories();
Poco::File(path + "metadata/").createDirectories();
/// Directory with metadata of tables, which was marked as dropped by Atomic database
Poco::File(path + "metadata_dropped/").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 '{}' doesn't exist or exists and empty. Will use '{}' as replica host.",
host_tag, this_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", log));
/// Initialize main config reloader.
std::string include_from_path = config().getString("include_from", "/etc/metrika.xml");
if (config().has("query_masking_rules"))
{
SensitiveDataMasker::setInstance(std::make_unique<SensitiveDataMasker>(config(), "query_masking_rules"));
}
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)
{
Settings::checkNoSettingNamesAtTopLevel(*config, config_path);
// FIXME logging-related things need synchronization -- see the 'Logger * log' saved
// in a lot of places. For now, disable updating log configuration without server restart.
//setTextLog(global_context->getTextLog());
//buildLoggers(*config, logger());
global_context->setClustersConfig(config);
global_context->setMacros(std::make_unique<Macros>(*config, "macros", log));
global_context->setExternalAuthenticatorsConfig(*config);
/// 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"));
if (config->has("zookeeper"))
global_context->reloadZooKeeperIfChanged(config);
global_context->updateStorageConfiguration(*config);
},
/* already_loaded = */ true);
auto & access_control = global_context->getAccessControlManager();
if (config().has("custom_settings_prefixes"))
access_control.setCustomSettingsPrefixes(config().getString("custom_settings_prefixes"));
/// Initialize access storages.
access_control.addStoragesFromMainConfig(config(), config_path, [&] { return global_context->getZooKeeper(); });
/// Reload config in SYSTEM RELOAD CONFIG query.
global_context->setConfigReloadCallback([&]()
{
main_config_reloader->reload();
access_control.reloadUsersConfigs();
});
/// Limit on total number of concurrently executed queries.
global_context->getProcessList().setMaxSize(config().getInt("max_concurrent_queries", 0));
/// Set up caches.
/// Lower cache size on low-memory systems.
double cache_size_to_ram_max_ratio = config().getDouble("cache_size_to_ram_max_ratio", 0.5);
size_t max_cache_size = memory_amount * cache_size_to_ram_max_ratio;
/// Size of cache for uncompressed blocks. Zero means disabled.
size_t uncompressed_cache_size = config().getUInt64("uncompressed_cache_size", 0);
if (uncompressed_cache_size > max_cache_size)
{
uncompressed_cache_size = max_cache_size;
LOG_INFO(log, "Uncompressed cache size was lowered to {} because the system has low amount of memory",
formatReadableSizeWithBinarySuffix(uncompressed_cache_size));
}
global_context->setUncompressedCache(uncompressed_cache_size);
/// Load global settings from default_profile and system_profile.
global_context->setDefaultProfiles(config());
const Settings & settings = global_context->getSettingsRef();
/// Size of cache for marks (index of MergeTree family of tables). It is mandatory.
size_t mark_cache_size = config().getUInt64("mark_cache_size");
if (!mark_cache_size)
LOG_ERROR(log, "Too low mark cache size will lead to severe performance degradation.");
if (mark_cache_size > max_cache_size)
{
mark_cache_size = max_cache_size;
LOG_INFO(log, "Mark cache size was lowered to {} because the system has low amount of memory",
formatReadableSizeWithBinarySuffix(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();
/// Check sanity of MergeTreeSettings on server startup
global_context->getMergeTreeSettings().sanityCheck(settings);
global_context->getReplicatedMergeTreeSettings().sanityCheck(settings);
/// Limit on total memory usage
size_t max_server_memory_usage = config().getUInt64("max_server_memory_usage", 0);
double max_server_memory_usage_to_ram_ratio = config().getDouble("max_server_memory_usage_to_ram_ratio", 0.9);
size_t default_max_server_memory_usage = memory_amount * max_server_memory_usage_to_ram_ratio;
if (max_server_memory_usage == 0)
{
max_server_memory_usage = default_max_server_memory_usage;
LOG_INFO(log, "Setting max_server_memory_usage was set to {}"
" ({} available * {:.2f} max_server_memory_usage_to_ram_ratio)",
formatReadableSizeWithBinarySuffix(max_server_memory_usage),
formatReadableSizeWithBinarySuffix(memory_amount),
max_server_memory_usage_to_ram_ratio);
}
else if (max_server_memory_usage > default_max_server_memory_usage)
{
max_server_memory_usage = default_max_server_memory_usage;
LOG_INFO(log, "Setting max_server_memory_usage was lowered to {}"
" because the system has low amount of memory. The amount was"
" calculated as {} available"
" * {:.2f} max_server_memory_usage_to_ram_ratio",
formatReadableSizeWithBinarySuffix(max_server_memory_usage),
formatReadableSizeWithBinarySuffix(memory_amount),
max_server_memory_usage_to_ram_ratio);
}
total_memory_tracker.setOrRaiseHardLimit(max_server_memory_usage);
total_memory_tracker.setDescription("(total)");
total_memory_tracker.setMetric(CurrentMetrics::MemoryTracking);
/// Set current database name before loading tables and databases because
/// system logs may copy global context.
global_context->setCurrentDatabaseNameInGlobalContext(default_database);
LOG_INFO(log, "Loading metadata from {}", path);
try
{
loadMetadataSystem(*global_context);
/// After attaching system databases we can initialize system log.
global_context->initializeSystemLogs();
auto & database_catalog = DatabaseCatalog::instance();
/// After the system database is created, attach virtual system tables (in addition to query_log and part_log)
attachSystemTablesServer(*database_catalog.getSystemDatabase(), has_zookeeper);
/// Then, load remaining databases
loadMetadata(*global_context, default_database);
database_catalog.loadDatabases();
/// After loading validate that default database exists
database_catalog.assertDatabaseExists(default_database);
}
catch (...)
{
tryLogCurrentException(log, "Caught exception while loading metadata");
throw;
}
LOG_DEBUG(log, "Loaded metadata.");
/// Init trace collector only after trace_log system table was created
/// Disable it if we collect test coverage information, because it will work extremely slow.
///
/// It also cannot work with sanitizers.
/// Sanitizers are using quick "frame walking" stack unwinding (this implies -fno-omit-frame-pointer)
/// And they do unwinding frequently (on every malloc/free, thread/mutex operations, etc).
/// They change %rbp during unwinding and it confuses libunwind if signal comes during sanitizer unwinding
/// and query profiler decide to unwind stack with libunwind at this moment.
///
/// Symptoms: you'll get silent Segmentation Fault - without sanitizer message and without usual ClickHouse diagnostics.
///
/// Look at compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
///
#if USE_UNWIND && !WITH_COVERAGE && !defined(SANITIZER)
/// Profilers cannot work reliably with any other libunwind or without PHDR cache.
if (hasPHDRCache())
{
global_context->initializeTraceCollector();
/// Set up server-wide memory profiler (for total memory tracker).
UInt64 total_memory_profiler_step = config().getUInt64("total_memory_profiler_step", 0);
if (total_memory_profiler_step)
{
total_memory_tracker.setOrRaiseProfilerLimit(total_memory_profiler_step);
total_memory_tracker.setProfilerStep(total_memory_profiler_step);
}
double total_memory_tracker_sample_probability = config().getDouble("total_memory_tracker_sample_probability", 0);
if (total_memory_tracker_sample_probability)
{
total_memory_tracker.setSampleProbability(total_memory_tracker_sample_probability);
}
}
#endif
/// Describe multiple reasons when query profiler cannot work.
#if !USE_UNWIND
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they cannot work without bundled unwind (stack unwinding) library.");
#endif
#if WITH_COVERAGE
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they work extremely slow with test coverage.");
#endif
#if defined(SANITIZER)
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they cannot work under sanitizers"
" when two different stack unwinding methods will interfere with each other.");
#endif
if (!hasPHDRCache())
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they require PHDR cache to be created"
" (otherwise the function 'dl_iterate_phdr' is not lock free and not async-signal safe).");
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/");
int pool_size = config().getInt("distributed_ddl.pool_size", 1);
if (pool_size < 1)
throw Exception("distributed_ddl.pool_size should be greater then 0", ErrorCodes::ARGUMENT_OUT_OF_BOUND);
global_context->setDDLWorker(std::make_unique<DDLWorker>(pool_size, 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();
LOG_DEBUG(log, "DNS caching disabled");
}
else
{
/// Initialize a watcher periodically updating DNS cache
dns_cache_updater = std::make_unique<DNSCacheUpdater>(*global_context, config().getInt("dns_cache_update_period", 15));
}
#if defined(OS_LINUX)
if (!TasksStatsCounters::checkIfAvailable())
{
LOG_INFO(log, "It looks like this system does not have procfs mounted at /proc location,"
" neither clickhouse-server process has CAP_NET_ADMIN capability."
" 'taskstats' performance statistics will be disabled."
" It could happen due to incorrect ClickHouse package installation."
" You can try to resolve the problem manually with 'sudo setcap cap_net_admin=+ep {}'."
" 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.",
executable_path);
}
if (!hasLinuxCapability(CAP_SYS_NICE))
{
LOG_INFO(log, "It looks like the process has no CAP_SYS_NICE capability, the setting 'os_thread_priority' will have no effect."
" It could happen due to incorrect ClickHouse package installation."
" You could resolve the problem manually with 'sudo setcap cap_sys_nice=+ep {}'."
" Note that it will not work on 'nosuid' mounted filesystems.",
executable_path);
}
#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 ({}), error {}: {}. "
"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>",
host, e.code(), e.message());
}
throw;
}
return socket_address;
};
auto socket_bind_listen = [&](auto & socket, const std::string & host, UInt16 port, [[maybe_unused]] bool secure = false)
{
auto address = make_socket_address(host, port);
#if !defined(POCO_CLICKHOUSE_PATCH) || POCO_VERSION < 0x01090100
if (secure)
/// Bug in old (<1.9.1) 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;
};
/// This object will periodically calculate some metrics.
AsynchronousMetrics async_metrics(*global_context,
config().getUInt("asynchronous_metrics_update_period_s", 60));
attachSystemTablesAsync(*DatabaseCatalog::instance().getSystemDatabase(), async_metrics);
for (const auto & listen_host : listen_hosts)
{
auto create_server = [&](const char * port_name, auto && func)
{
/// For testing purposes, user may omit tcp_port or http_port or https_port in configuration file.
if (!config().has(port_name))
return;
auto port = config().getInt(port_name);
try
{
func(port);
}
catch (const Poco::Exception &)
{
std::string message = "Listen [" + listen_host + "]:" + std::to_string(port) + " failed: " + getCurrentExceptionMessage(false);
if (listen_try)
{
LOG_WARNING(log, "{}. 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>",
message);
}
else
{
throw Exception{message, ErrorCodes::NETWORK_ERROR};
}
}
};
/// HTTP
create_server("http_port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
createHandlerFactory(*this, async_metrics, "HTTPHandler-factory"), server_pool, socket, http_params));
LOG_INFO(log, "Listening for http://{}", address.toString());
});
/// HTTPS
create_server("https_port", [&](UInt16 port)
{
#if USE_SSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port, /* secure = */ true);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
createHandlerFactory(*this, async_metrics, "HTTPSHandler-factory"), server_pool, socket, http_params));
LOG_INFO(log, "Listening for https://{}", address.toString());
#else
UNUSED(port);
throw Exception{"HTTPS protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
});
/// TCP
create_server("tcp_port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, 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 for connections with native protocol (tcp): {}", address.toString());
});
/// TCP with SSL
create_server("tcp_port_secure", [&](UInt16 port)
{
#if USE_SSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port, /* 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 for connections with secure native protocol (tcp_secure): {}", address.toString());
#else
UNUSED(port);
throw Exception{"SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
});
/// Interserver IO HTTP
create_server("interserver_http_port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
createHandlerFactory(*this, async_metrics, "InterserverIOHTTPHandler-factory"), server_pool, socket, http_params));
LOG_INFO(log, "Listening for replica communication (interserver): http://{}", address.toString());
});
create_server("interserver_https_port", [&](UInt16 port)
{
#if USE_SSL
Poco::Net::SecureServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port, /* secure = */ true);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
createHandlerFactory(*this, async_metrics, "InterserverIOHTTPSHandler-factory"), server_pool, socket, http_params));
LOG_INFO(log, "Listening for secure replica communication (interserver): https://{}", address.toString());
#else
UNUSED(port);
throw Exception{"SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.",
ErrorCodes::SUPPORT_IS_DISABLED};
#endif
});
create_server("mysql_port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port, /* secure = */ true);
socket.setReceiveTimeout(Poco::Timespan());
socket.setSendTimeout(settings.send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::TCPServer>(
new MySQLHandlerFactory(*this),
server_pool,
socket,
new Poco::Net::TCPServerParams));
LOG_INFO(log, "Listening for MySQL compatibility protocol: {}", address.toString());
});
create_server("postgresql_port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port, /* secure = */ true);
socket.setReceiveTimeout(Poco::Timespan());
socket.setSendTimeout(settings.send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::TCPServer>(
new PostgreSQLHandlerFactory(*this),
server_pool,
socket,
new Poco::Net::TCPServerParams));
LOG_INFO(log, "Listening for PostgreSQL compatibility protocol: " + address.toString());
});
/// Prometheus (if defined and not setup yet with http_port)
create_server("prometheus.port", [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socket_bind_listen(socket, listen_host, port);
socket.setReceiveTimeout(settings.http_receive_timeout);
socket.setSendTimeout(settings.http_send_timeout);
servers.emplace_back(std::make_unique<Poco::Net::HTTPServer>(
createHandlerFactory(*this, async_metrics, "PrometheusHandler-factory"), server_pool, socket, http_params));
LOG_INFO(log, "Listening for Prometheus: http://{}", address.toString());
});
}
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);
global_context->enableNamedSessions();
for (auto & server : servers)
server->start();
{
String level_str = config().getString("text_log.level", "");
int level = level_str.empty() ? INT_MAX : Poco::Logger::parseLevel(level_str);
setTextLog(global_context->getTextLog(), level);
}
buildLoggers(config(), logger());
main_config_reloader->start();
access_control.startPeriodicReloadingUsersConfigs();
if (dns_cache_updater)
dns_cache_updater->start();
{
LOG_INFO(log, "Available RAM: {}; physical cores: {}; logical cores: {}.",
formatReadableSizeWithBinarySuffix(memory_amount),
getNumberOfPhysicalCPUCores(), // on ARM processors it can show only enabled at current moment cores
std::thread::hardware_concurrency());
}
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();
}
if (current_connections)
LOG_INFO(log, "Closed all listening sockets. Waiting for {} outstanding connections.", current_connections);
else
LOG_INFO(log, "Closed all listening sockets.");
/// Killing remaining queries.
global_context->getProcessList().killAllQueries();
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));
}
}
if (current_connections)
LOG_INFO(log, "Closed connections. But {} remain."
" Tip: To increase wait time add to config: <shutdown_wait_unfinished>60</shutdown_wait_unfinished>", current_connections);
else
LOG_INFO(log, "Closed connections.");
dns_cache_updater.reset();
main_config_reloader.reset();
if (current_connections)
{
/// There is no better way to force connections to close in Poco.
/// Otherwise connection handlers will continue to live
/// (they are effectively dangling objects, but they use global thread pool
/// and global thread pool destructor will wait for threads, preventing server shutdown).
/// Dump coverage here, because std::atexit callback would not be called.
dumpCoverageReportIfPossible();
LOG_INFO(log, "Will shutdown forcefully.");
_exit(Application::EXIT_OK);
}
});
/// try to load dictionaries immediately, throw on error and die
ext::scope_guard dictionaries_xmls, models_xmls;
try
{
if (!config().getBool("dictionaries_lazy_load", true))
{
global_context->tryCreateEmbeddedDictionaries();
global_context->getExternalDictionariesLoader().enableAlwaysLoadEverything(true);
}
dictionaries_xmls = global_context->getExternalDictionariesLoader().addConfigRepository(
std::make_unique<ExternalLoaderXMLConfigRepository>(config(), "dictionaries_config"));
models_xmls = global_context->getExternalModelsLoader().addConfigRepository(
std::make_unique<ExternalLoaderXMLConfigRepository>(config(), "models_config"));
}
catch (...)
{
LOG_ERROR(log, "Caught exception while loading dictionaries.");
throw;
}
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->getConfigRef(), graphite_key, async_metrics));
}
waitForTerminationRequest();
}
return Application::EXIT_OK;
}
}
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