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Copy pathKeeper.cpp
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726 lines (608 loc) · 26.9 KB
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#include <Keeper.h>
#include <Common/ClickHouseRevision.h>
#include <Common/ZooKeeper/ZooKeeperNodeCache.h>
#include <Common/formatReadable.h>
#include <Common/getMultipleKeysFromConfig.h>
#include <Common/DNSResolver.h>
#include <Interpreters/DNSCacheUpdater.h>
#include <Coordination/Defines.h>
#include <Common/Config/ConfigReloader.h>
#include <filesystem>
#include <Core/ServerUUID.h>
#include <Common/logger_useful.h>
#include <Common/CgroupsMemoryUsageObserver.h>
#include <Common/DateLUT.h>
#include <Common/MemoryWorker.h>
#include <Common/ErrorHandlers.h>
#include <Common/assertProcessUserMatchesDataOwner.h>
#include <Common/makeSocketAddress.h>
#include <Server/waitServersToFinish.h>
#include <Server/CloudPlacementInfo.h>
#include <base/getMemoryAmount.h>
#include <base/scope_guard.h>
#include <base/safeExit.h>
#include <base/Numa.h>
#include <Poco/Net/NetException.h>
#include <Poco/Net/TCPServerParams.h>
#include <Poco/Net/TCPServer.h>
#include <Poco/Util/HelpFormatter.h>
#include <Poco/Environment.h>
#include <sys/stat.h>
#include <pwd.h>
#include <Common/Jemalloc.h>
#include <Interpreters/Context.h>
#include <Coordination/KeeperContext.h>
#include <Coordination/FourLetterCommand.h>
#include <Coordination/KeeperAsynchronousMetrics.h>
#include <Server/HTTP/HTTPServer.h>
#include <Server/HTTPHandlerFactory.h>
#include <Server/KeeperHTTPHandlerFactory.h>
#include <Server/PrometheusRequestHandlerFactory.h>
#include <Server/TCPServer.h>
#include <Core/Defines.h>
#include "config.h"
#include <Common/config_version.h>
#include "config_tools.h"
#if USE_SSL
# include <Poco/Net/Context.h>
# include <Poco/Net/SecureServerSocket.h>
# include <Server/CertificateReloader.h>
#endif
#include <Server/ProtocolServerAdapter.h>
#include <Server/KeeperTCPHandlerFactory.h>
#include <Disks/registerDisks.h>
/// A minimal file used when the keeper is run without installation
constexpr unsigned char keeper_resource_embedded_xml[] =
{
#embed "keeper_embedded.xml"
};
extern const char * GIT_HASH;
int mainEntryClickHouseKeeper(int argc, char ** argv)
{
DB::Keeper app;
try
{
return app.run(argc, argv);
}
catch (...)
{
std::cerr << DB::getCurrentExceptionMessage(true) << "\n";
auto code = DB::getCurrentExceptionCode();
return static_cast<UInt8>(code) ? code : 1;
}
}
namespace DB
{
namespace ErrorCodes
{
extern const int NO_ELEMENTS_IN_CONFIG;
extern const int SUPPORT_IS_DISABLED;
extern const int NETWORK_ERROR;
extern const int LOGICAL_ERROR;
}
namespace ServerSetting
{
extern const ServerSettingsBool jemalloc_enable_global_profiler;
extern const ServerSettingsBool jemalloc_collect_global_profile_samples_in_trace_log;
extern const ServerSettingsBool jemalloc_enable_background_threads;
extern const ServerSettingsUInt64 jemalloc_max_background_threads_num;
extern const ServerSettingsUInt64 jemalloc_profiler_sampling_rate;
extern const ServerSettingsUInt64 memory_worker_period_ms;
extern const ServerSettingsDouble memory_worker_purge_dirty_pages_threshold_ratio;
extern const ServerSettingsDouble memory_worker_purge_total_memory_threshold_ratio;
extern const ServerSettingsBool memory_worker_correct_memory_tracker;
extern const ServerSettingsBool memory_worker_use_cgroup;
extern const ServerSettingsUInt64 memory_worker_decay_adjustment_period_ms;
}
Poco::Net::SocketAddress Keeper::socketBindListen(Poco::Net::ServerSocket & socket, const std::string & host, UInt16 port, [[maybe_unused]] bool secure) const
{
auto address = makeSocketAddress(host, port, &logger());
socket.bind(address, /* reuseAddress = */ true, /* reusePort = */ config().getBool("listen_reuse_port", false));
socket.listen(/* backlog = */ config().getUInt("listen_backlog", 64));
return address;
}
void Keeper::createServer(const std::string & listen_host, const char * port_name, bool listen_try, CreateServerFunc && func) const
{
/// 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(static_cast<UInt16>(port));
}
catch (const Poco::Exception &)
{
if (listen_try)
{
LOG_WARNING(&logger(), "Listen [{}]:{} failed: {}. 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>",
listen_host, port, getCurrentExceptionMessage(false));
}
else
{
throw Exception(ErrorCodes::NETWORK_ERROR, "Listen [{}]:{} failed: {}", listen_host, port, getCurrentExceptionMessage(false));
}
}
}
void Keeper::uninitialize()
{
logger().information("shutting down");
BaseDaemon::uninitialize();
}
int Keeper::run()
{
if (config().hasOption("help"))
{
Poco::Util::HelpFormatter help_formatter(Keeper::options());
auto header_str = fmt::format("{0} [OPTION] [-- [ARG]...]\n"
#if ENABLE_CLICKHOUSE_KEEPER_CLIENT
"{0} client [OPTION]\n"
#endif
"positional arguments can be used to rewrite config.xml properties, for example, --http_port=8010",
commandName());
help_formatter.setHeader(header_str);
help_formatter.format(std::cout);
return 0;
}
if (config().hasOption("version"))
{
std::cout << VERSION_NAME << " keeper version " << VERSION_STRING << VERSION_OFFICIAL << "." << std::endl;
return 0;
}
return Application::run(); // NOLINT
}
void Keeper::initialize(Poco::Util::Application & self)
{
ConfigProcessor::registerEmbeddedConfig("keeper_config.xml", std::string_view(reinterpret_cast<const char *>(keeper_resource_embedded_xml), std::size(keeper_resource_embedded_xml)));
BaseDaemon::initialize(self);
logger().information("starting up");
LOG_INFO(&logger(), "OS Name = {}, OS Version = {}, OS Architecture = {}",
Poco::Environment::osName(),
Poco::Environment::osVersion(),
Poco::Environment::osArchitecture());
}
std::string Keeper::getDefaultConfigFileName() const
{
return "keeper_config.xml";
}
bool Keeper::allowTextLog() const
{
return false;
}
void Keeper::handleCustomArguments(const std::string & arg, [[maybe_unused]] const std::string & value) // NOLINT
{
if (arg == "force-recovery")
{
assert(value.empty());
config().setBool("keeper_server.force_recovery", true);
return;
}
throw Exception(ErrorCodes::LOGICAL_ERROR, "Invalid argument {} provided", arg);
}
void Keeper::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"));
options.addOption(
Poco::Util::Option("force-recovery", "force-recovery", "Force recovery mode allowing Keeper to overwrite cluster configuration without quorum")
.required(false)
.repeatable(false)
.noArgument()
.callback(Poco::Util::OptionCallback<Keeper>(this, &Keeper::handleCustomArguments)));
BaseDaemon::defineOptions(options);
}
namespace
{
struct KeeperHTTPContext : public IHTTPContext
{
explicit KeeperHTTPContext(ContextPtr context_)
: context(std::move(context_))
{}
uint64_t getMaxHstsAge() const override
{
return context->getConfigRef().getUInt64("keeper_server.hsts_max_age", 0);
}
uint64_t getMaxUriSize() const override
{
return context->getConfigRef().getUInt64("keeper_server.http_max_uri_size", 1048576);
}
uint64_t getMaxFields() const override
{
return context->getConfigRef().getUInt64("keeper_server.http_max_fields", 1000000);
}
uint64_t getMaxFieldNameSize() const override
{
return context->getConfigRef().getUInt64("keeper_server.http_max_field_name_size", 128 * 1024);
}
uint64_t getMaxFieldValueSize() const override
{
return context->getConfigRef().getUInt64("keeper_server.http_max_field_value_size", 128 * 1024);
}
Poco::Timespan getReceiveTimeout() const override
{
return {context->getConfigRef().getInt64("keeper_server.http_receive_timeout", DBMS_DEFAULT_RECEIVE_TIMEOUT_SEC), 0};
}
Poco::Timespan getSendTimeout() const override
{
return {context->getConfigRef().getInt64("keeper_server.http_send_timeout", DBMS_DEFAULT_SEND_TIMEOUT_SEC), 0};
}
ContextPtr context;
};
HTTPContextPtr httpContext()
{
return std::make_shared<KeeperHTTPContext>(Context::getGlobalContextInstance());
}
String getKeeperPath(Poco::Util::LayeredConfiguration & config)
{
String path;
if (config.has("keeper_server.storage_path"))
{
path = config.getString("keeper_server.storage_path");
}
else if (config.has("keeper_server.log_storage_path"))
{
path = std::filesystem::path(config.getString("keeper_server.log_storage_path")).parent_path();
}
else if (config.has("keeper_server.snapshot_storage_path"))
{
path = std::filesystem::path(config.getString("keeper_server.snapshot_storage_path")).parent_path();
}
else if (std::filesystem::is_directory(std::filesystem::path{config.getString("path", DBMS_DEFAULT_PATH)} / "coordination"))
{
throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG,
"By default 'keeper_server.storage_path' could be assigned to {}, but the directory {} already exists. Please specify 'keeper_server.storage_path' in the keeper configuration explicitly",
KEEPER_DEFAULT_PATH, String{std::filesystem::path{config.getString("path", DBMS_DEFAULT_PATH)} / "coordination"});
}
else
{
path = KEEPER_DEFAULT_PATH;
}
return path;
}
}
int Keeper::main(const std::vector<std::string> & /*args*/)
try
{
ServerSettings server_settings;
server_settings.loadSettingsFromConfig(config());
#if USE_JEMALLOC
Jemalloc::verifySetup(
server_settings[ServerSetting::jemalloc_enable_global_profiler],
server_settings[ServerSetting::jemalloc_enable_background_threads],
server_settings[ServerSetting::jemalloc_max_background_threads_num],
server_settings[ServerSetting::jemalloc_collect_global_profile_samples_in_trace_log],
server_settings[ServerSetting::jemalloc_profiler_sampling_rate]);
#endif
Poco::Logger * log = &logger();
MainThreadStatus::getInstance();
if (auto total_numa_memory = getNumaNodesTotalMemory(); total_numa_memory.has_value())
{
LOG_INFO(
log, "Keeper is bound to a subset of NUMA nodes. Total memory of all available nodes: {}", ReadableSize(*total_numa_memory));
}
#if !defined(NDEBUG) || !defined(__OPTIMIZE__)
LOG_WARNING(log, "Keeper was built in debug mode. It will work slowly.");
#endif
#if defined(SANITIZER)
LOG_WARNING(log, "Keeper was built with sanitizer. It will work slowly.");
#endif
if (!config().has("keeper_server"))
throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG, "Keeper configuration (<keeper_server> section) not found in config");
KeeperContext::initializeKeeperMemorySoftLimit(config(), log);
std::string path = getKeeperPath(config());
std::filesystem::create_directories(path);
/// Check that the process user id matches the owner of the data.
assertProcessUserMatchesDataOwner(path, [&](const PreformattedMessage & message){ LOG_WARNING(log, fmt::runtime(message.text)); });
DB::ServerUUID::load(path + "/uuid", log);
std::string include_from_path = config().getString("include_from", "/etc/metrika.xml");
PlacementInfo::PlacementInfo::instance().initialize(config());
GlobalThreadPool::initialize(
/// We need to have sufficient amount of threads for connections + nuraft workers + keeper workers, 1000 is an estimation
std::min(1000U, config().getUInt("max_thread_pool_size", 1000)),
config().getUInt("max_thread_pool_free_size", 100),
config().getUInt("thread_pool_queue_size", 1000)
);
/// Wait for all threads to avoid possible use-after-free (for example logging objects can be already destroyed).
SCOPE_EXIT({
Stopwatch watch;
LOG_INFO(log, "Waiting for background threads");
GlobalThreadPool::instance().shutdown();
LOG_INFO(log, "Background threads finished in {} ms", watch.elapsedMilliseconds());
});
MemoryWorkerConfig memory_worker_config{
.rss_update_period_ms = server_settings[ServerSetting::memory_worker_period_ms],
.purge_dirty_pages_threshold_ratio = server_settings[ServerSetting::memory_worker_purge_dirty_pages_threshold_ratio],
.purge_total_memory_threshold_ratio = server_settings[ServerSetting::memory_worker_purge_total_memory_threshold_ratio],
.correct_tracker = server_settings[ServerSetting::memory_worker_correct_memory_tracker],
.decay_adjustment_period_ms = server_settings[ServerSetting::memory_worker_decay_adjustment_period_ms],
.use_cgroup = server_settings[ServerSetting::memory_worker_use_cgroup],
};
MemoryWorker memory_worker(memory_worker_config, /*page_cache_=*/nullptr);
memory_worker.start();
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::serverTimezoneInstance();
LOG_TRACE(log, "Initialized DateLUT with time zone '{}'.", getDateLUTTimeZone(DateLUT::serverTimezoneInstance()));
/// Don't want to use DNS cache
DNSResolver::instance().setDisableCacheFlag();
Poco::ThreadPool server_pool(3, config().getUInt("max_connections", 1024));
std::mutex servers_lock;
auto servers = std::make_shared<std::vector<ProtocolServerAdapter>>();
auto shared_context = Context::createShared();
auto global_context = Context::createGlobal(shared_context.get());
global_context->makeGlobalContext();
global_context->setApplicationType(Context::ApplicationType::KEEPER);
global_context->setPath(path);
global_context->setRemoteHostFilter(config());
if (config().has("macros"))
global_context->setMacros(std::make_unique<Macros>(config(), "macros", log));
registerDisks(/*global_skip_access_check=*/false);
/// This object will periodically calculate some metrics.
KeeperAsynchronousMetrics async_metrics(
global_context,
config().getUInt("asynchronous_metrics_update_period_s", 1),
[&]() -> std::vector<ProtocolServerMetrics>
{
std::vector<ProtocolServerMetrics> metrics;
std::lock_guard lock(servers_lock);
metrics.reserve(servers->size());
for (const auto & server : *servers)
metrics.emplace_back(ProtocolServerMetrics{server.getPortName(), server.currentThreads(), server.refusedConnections()});
return metrics;
},
/*update_jemalloc_epoch_=*/memory_worker.getSource() != MemoryWorker::MemoryUsageSource::Jemalloc,
/*update_rss_=*/memory_worker.getSource() == MemoryWorker::MemoryUsageSource::None);
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;
}
/// Initialize keeper RAFT. Do nothing if no keeper_server in config.
global_context->initializeKeeperDispatcher(/* start_async = */ false);
FourLetterCommandFactory::registerCommands(*global_context->getKeeperDispatcher());
auto config_getter = [&] () -> const Poco::Util::AbstractConfiguration &
{
return global_context->getConfigRef();
};
auto tcp_receive_timeout = config().getInt64("keeper_server.socket_receive_timeout_sec", DBMS_DEFAULT_RECEIVE_TIMEOUT_SEC);
auto tcp_send_timeout = config().getInt64("keeper_server.socket_send_timeout_sec", DBMS_DEFAULT_SEND_TIMEOUT_SEC);
auto tcp_nodelay = config().getBool("keeper_server.tcp_nodelay", true);
for (const auto & listen_host : listen_hosts)
{
/// TCP Keeper
const char * port_name = "keeper_server.tcp_port";
createServer(listen_host, port_name, listen_try, [&](UInt16 port)
{
Poco::Net::ServerSocket socket;
auto address = socketBindListen(socket, listen_host, port);
socket.setReceiveTimeout(Poco::Timespan{tcp_receive_timeout, 0});
socket.setSendTimeout(Poco::Timespan{tcp_send_timeout, 0});
Poco::Net::TCPServerParams::Ptr tcp_params = new Poco::Net::TCPServerParams;
tcp_params->setNoDelay(tcp_nodelay);
servers->emplace_back(
listen_host,
port_name,
"Keeper (tcp): " + address.toString(),
std::make_unique<TCPServer>(
new KeeperTCPHandlerFactory(
config_getter, global_context->getKeeperDispatcher(),
tcp_receive_timeout, tcp_send_timeout, false), server_pool, socket, tcp_params));
});
const char * secure_port_name = "keeper_server.tcp_port_secure";
createServer(listen_host, secure_port_name, listen_try, [&](UInt16 port)
{
#if USE_SSL
Poco::Net::SecureServerSocket socket;
auto address = socketBindListen(socket, listen_host, port, /* secure = */ true);
socket.setReceiveTimeout(Poco::Timespan{tcp_receive_timeout, 0});
socket.setSendTimeout(Poco::Timespan{tcp_send_timeout, 0});
Poco::Net::TCPServerParams::Ptr tcp_params = new Poco::Net::TCPServerParams;
tcp_params->setNoDelay(tcp_nodelay);
servers->emplace_back(
listen_host,
secure_port_name,
"Keeper with secure protocol (tcp_secure): " + address.toString(),
std::make_unique<TCPServer>(
new KeeperTCPHandlerFactory(
config_getter, global_context->getKeeperDispatcher(),
tcp_receive_timeout, tcp_send_timeout, true), server_pool, socket, tcp_params));
#else
UNUSED(port);
throw Exception(ErrorCodes::SUPPORT_IS_DISABLED, "SSL support for TCP protocol is disabled because Poco library was built without NetSSL support.");
#endif
});
const auto & config = config_getter();
auto http_context = httpContext();
Poco::Timespan keep_alive_timeout(config.getUInt("keep_alive_timeout", 10), 0);
Poco::Net::HTTPServerParams::Ptr http_params = new Poco::Net::HTTPServerParams;
http_params->setTimeout(http_context->getReceiveTimeout());
http_params->setKeepAliveTimeout(keep_alive_timeout);
/// Prometheus (if defined and not setup yet with http_port)
port_name = "prometheus.port";
createServer(
listen_host,
port_name,
listen_try,
[&, my_http_context = std::move(http_context)](UInt16 port) mutable
{
Poco::Net::ServerSocket socket;
auto address = socketBindListen(socket, listen_host, port);
socket.setReceiveTimeout(my_http_context->getReceiveTimeout());
socket.setSendTimeout(my_http_context->getSendTimeout());
servers->emplace_back(
listen_host,
port_name,
"Prometheus: http://" + address.toString(),
std::make_unique<HTTPServer>(
std::move(my_http_context),
createKeeperPrometheusHandlerFactory(*this, config, async_metrics, "PrometheusHandler-factory"),
server_pool,
socket,
http_params));
});
/// HTTP control endpoints
port_name = "keeper_server.http_control.port";
createServer(listen_host, port_name, listen_try, [&](UInt16 port) mutable
{
auto my_http_context = httpContext();
Poco::Net::ServerSocket socket;
auto address = socketBindListen(socket, listen_host, port);
socket.setReceiveTimeout(my_http_context->getReceiveTimeout());
socket.setSendTimeout(my_http_context->getSendTimeout());
servers->emplace_back(
listen_host,
port_name,
"HTTP Control: http://" + address.toString(),
std::make_unique<HTTPServer>(
std::move(my_http_context),
createKeeperHTTPHandlerFactory(*this, config, global_context->getKeeperDispatcher(), "KeeperHTTPHandler-factory"),
server_pool,
socket,
http_params));
});
/// HTTPS control endpoints
port_name = "keeper_server.http_control.secure_port";
createServer(listen_host, port_name, listen_try, [&](UInt16 port) mutable
{
auto my_http_context = httpContext();
Poco::Net::ServerSocket socket;
auto address = socketBindListen(socket, listen_host, port);
socket.setReceiveTimeout(my_http_context->getReceiveTimeout());
socket.setSendTimeout(my_http_context->getSendTimeout());
servers->emplace_back(
listen_host,
port_name,
"HTTPS Control: https://" + address.toString(),
std::make_unique<HTTPServer>(
std::move(my_http_context),
createKeeperHTTPHandlerFactory(*this, config, global_context->getKeeperDispatcher(), "KeeperHTTPSHandler-factory"),
server_pool,
socket,
http_params));
});
}
for (auto & server : *servers)
{
server.start();
LOG_INFO(log, "Listening for {}", server.getDescription());
}
async_metrics.start();
Coordination::EventPtr unused_event = std::make_shared<Poco::Event>();
const std::string cert_path = config().getString("openSSL.server.certificateFile", "");
const std::string key_path = config().getString("openSSL.server.privateKeyFile", "");
std::vector<std::string> extra_paths = {include_from_path};
if (!cert_path.empty())
extra_paths.emplace_back(cert_path);
if (!key_path.empty())
extra_paths.emplace_back(key_path);
/// ConfigReloader have to strict parameters which are redundant in our case
auto main_config_reloader = std::make_unique<ConfigReloader>(
config_path,
extra_paths,
getKeeperPath(config()),
/* zk_node_cache_= */ nullptr,
unused_event,
[&](ConfigurationPtr loaded_config, bool /* initial_loading */)
{
config().replace("default", loaded_config, PRIO_DEFAULT, true);
updateLevels(config(), logger());
KeeperContext::initializeKeeperMemorySoftLimit(config(), log);
if (config().has("keeper_server"))
global_context->updateKeeperConfiguration(config());
#if USE_SSL
CertificateReloader::instance().tryLoad(config());
CertificateReloader::instance().tryLoadClient(config());
#endif
});
SCOPE_EXIT({
LOG_INFO(log, "Shutting down.");
main_config_reloader.reset();
async_metrics.stop();
/// Signal Keeper TCP handlers to close before waiting for connections,
/// otherwise they keep running indefinitely and block shutdown.
global_context->signalKeeperDispatcherShutdown();
LOG_DEBUG(log, "Waiting for current connections to Keeper to finish.");
size_t 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.");
if (current_connections > 0)
current_connections = waitServersToFinish(*servers, servers_lock, config().getInt("shutdown_wait_unfinished", 5));
if (current_connections)
LOG_INFO(log, "Closed connections to Keeper. But {} remain. Probably some users cannot finish their connections after context shutdown.", current_connections);
else
LOG_INFO(log, "Closed connections to Keeper.");
global_context->shutdownKeeperDispatcher();
/// Wait server pool to avoid use-after-free of destroyed context in the handlers
server_pool.joinAll();
LOG_DEBUG(log, "Destroyed global context.");
if (current_connections)
{
LOG_INFO(log, "Will shutdown forcefully.");
safeExit(0);
}
});
buildLoggers(config(), logger());
main_config_reloader->start();
std::optional<CgroupsMemoryUsageObserver> cgroups_memory_usage_observer;
try
{
auto wait_time = config().getUInt64("keeper_server.cgroups_memory_observer_wait_time", 15);
if (wait_time != 0)
{
cgroups_memory_usage_observer.emplace(std::chrono::seconds(wait_time));
/// Not calling cgroups_memory_usage_observer->setLimits() here (as for the normal ClickHouse server) because Keeper controls
/// its memory usage by other means (via setting 'max_memory_usage_soft_limit').
cgroups_memory_usage_observer->setOnMemoryAmountAvailableChangedFn([&]() { main_config_reloader->reload(); });
cgroups_memory_usage_observer->startThread();
}
}
catch (Exception &)
{
tryLogCurrentException(log, "Disabling cgroup memory observer because of an error during initialization");
}
LOG_INFO(log, "Ready for connections.");
waitForTerminationRequest();
return Application::EXIT_OK;
}
catch (...)
{
/// Poco does not provide stacktrace.
tryLogCurrentException("Application");
auto code = getCurrentExceptionCode();
return static_cast<UInt8>(code) ? code : -1;
}
void Keeper::logRevision() const
{
LOG_INFO(getLogger("Application"),
"Starting ClickHouse Keeper {} (revision: {}, git hash: {}, build id: {}), PID {}",
VERSION_STRING,
ClickHouseRevision::getVersionRevision(),
GIT_HASH,
build_id.empty() ? "<unknown>" : build_id,
getpid());
}
}
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