mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-01 06:00:49 +00:00
346 lines
10 KiB
C++
346 lines
10 KiB
C++
#include <DB/Interpreters/ExternalDictionaries.h>
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#include <DB/Dictionaries/DictionaryFactory.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <ext/scope_guard.hpp>
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#include <Poco/Util/Application.h>
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#include <Poco/Glob.h>
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namespace
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{
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/// 5 seconds
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const auto backoff_initial_sec = 5;
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/// 10 minutes
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const auto backoff_max_sec = 10 * 60;
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}
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namespace DB
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{
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namespace
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{
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std::set<std::string> getDictionariesConfigPaths(const Poco::Util::AbstractConfiguration & config)
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{
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auto pattern = config.getString("dictionaries_config", "");
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if (pattern.empty())
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return {};
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std::set<std::string> files;
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if (pattern[0] != '/')
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{
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const auto app_config_path = config.getString("config-file", "config.xml");
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const auto config_dir = Poco::Path{app_config_path}.parent().toString();
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const auto absolute_path = config_dir + pattern;
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Poco::Glob::glob(absolute_path, files, 0);
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if (!files.empty())
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return files;
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}
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Poco::Glob::glob(pattern, files, 0);
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return files;
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}
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}
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void ExternalDictionaries::reloadImpl(const bool throw_on_error)
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{
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const auto config_paths = getDictionariesConfigPaths(Poco::Util::Application::instance().config());
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for (const auto & config_path : config_paths)
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{
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try
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{
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reloadFromFile(config_path, throw_on_error);
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}
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catch (...)
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{
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tryLogCurrentException(log, "reloadFromFile has thrown while reading from " + config_path);
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if (throw_on_error)
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throw;
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}
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}
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/// list of recreated dictionaries to perform delayed removal from unordered_map
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std::list<std::string> recreated_failed_dictionaries;
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/// retry loading failed dictionaries
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for (auto & failed_dictionary : failed_dictionaries)
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{
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if (std::chrono::system_clock::now() < failed_dictionary.second.next_attempt_time)
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continue;
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const auto & name = failed_dictionary.first;
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try
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{
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auto dict_ptr = failed_dictionary.second.dict->clone();
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if (const auto exception_ptr = dict_ptr->getCreationException())
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{
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/// recalculate next attempt time
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std::uniform_int_distribution<std::uint64_t> distribution(
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0, std::exp2(failed_dictionary.second.error_count));
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failed_dictionary.second.next_attempt_time = std::chrono::system_clock::now() +
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std::chrono::seconds{
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std::min<std::uint64_t>(backoff_max_sec, backoff_initial_sec + distribution(rnd_engine))};
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++failed_dictionary.second.error_count;
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std::rethrow_exception(exception_ptr);
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}
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else
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{
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const std::lock_guard<std::mutex> lock{dictionaries_mutex};
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const auto & lifetime = dict_ptr->getLifetime();
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std::uniform_int_distribution<std::uint64_t> distribution{lifetime.min_sec, lifetime.max_sec};
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update_times[name] = std::chrono::system_clock::now() + std::chrono::seconds{distribution(rnd_engine)};
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const auto dict_it = dictionaries.find(name);
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if (dict_it->second.dict)
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dict_it->second.dict->set(dict_ptr.release());
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else
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dict_it->second.dict = std::make_shared<MultiVersion<IDictionaryBase>>(dict_ptr.release());
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/// erase stored exception on success
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dict_it->second.exception = std::exception_ptr{};
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recreated_failed_dictionaries.push_back(name);
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}
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}
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catch (...)
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{
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tryLogCurrentException(log, "Failed reloading '" + name + "' dictionary");
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if (throw_on_error)
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throw;
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}
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}
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/// do not undertake further attempts to recreate these dictionaries
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for (const auto & name : recreated_failed_dictionaries)
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failed_dictionaries.erase(name);
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/// periodic update
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for (auto & dictionary : dictionaries)
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{
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const auto & name = dictionary.first;
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try
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{
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/// Если словарь не удалось ни разу загрузить или даже не удалось инициализировать из конфига.
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if (!dictionary.second.dict)
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continue;
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auto current = dictionary.second.dict->get();
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const auto & lifetime = current->getLifetime();
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/// do not update dictionaries with zero as lifetime
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if (lifetime.min_sec == 0 || lifetime.max_sec == 0)
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continue;
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/// update only non-cached dictionaries
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if (!current->isCached())
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{
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auto & update_time = update_times[current->getName()];
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/// check that timeout has passed
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if (std::chrono::system_clock::now() < update_time)
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continue;
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SCOPE_EXIT(
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/// calculate next update time
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std::uniform_int_distribution<std::uint64_t> distribution{lifetime.min_sec, lifetime.max_sec};
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update_time = std::chrono::system_clock::now() + std::chrono::seconds{distribution(rnd_engine)};
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);
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/// check source modified
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if (current->getSource()->isModified())
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{
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/// create new version of dictionary
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auto new_version = current->clone();
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if (const auto exception_ptr = new_version->getCreationException())
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std::rethrow_exception(exception_ptr);
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dictionary.second.dict->set(new_version.release());
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}
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}
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/// erase stored exception on success
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dictionary.second.exception = std::exception_ptr{};
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}
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catch (...)
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{
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dictionary.second.exception = std::current_exception();
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tryLogCurrentException(log, "Cannot update external dictionary '" + name + "', leaving old version");
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if (throw_on_error)
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throw;
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}
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}
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}
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void ExternalDictionaries::reloadFromFile(const std::string & config_path, const bool throw_on_error)
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{
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const Poco::File config_file{config_path};
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if (config_path.empty() || !config_file.exists())
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{
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LOG_WARNING(log, "config file '" + config_path + "' does not exist");
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}
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else
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{
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auto modification_time_it = last_modification_times.find(config_path);
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if (modification_time_it == std::end(last_modification_times))
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modification_time_it = last_modification_times.emplace(config_path, Poco::Timestamp{0}).first;
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auto & config_last_modified = modification_time_it->second;
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const auto last_modified = config_file.getLastModified();
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if (last_modified > config_last_modified)
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{
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/// definitions of dictionaries may have changed, recreate all of them
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config_last_modified = last_modified;
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const auto config = new Poco::Util::XMLConfiguration{config_path};
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SCOPE_EXIT(config->release());
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/// get all dictionaries' definitions
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Poco::Util::AbstractConfiguration::Keys keys;
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config->keys(keys);
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/// for each dictionary defined in xml config
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for (const auto & key : keys)
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{
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std::string name;
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if (0 != strncmp(key.data(), "dictionary", strlen("dictionary")))
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{
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if (0 != strncmp(key.data(), "comment", strlen("comment")))
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LOG_WARNING(log,
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config_path << ": unknown node in dictionaries file: '" << key + "', 'dictionary'");
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continue;
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}
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try
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{
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name = config->getString(key + ".name");
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if (name.empty())
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{
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LOG_WARNING(log, config_path << ": dictionary name cannot be empty");
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continue;
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}
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const auto dict_it = dictionaries.find(name);
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if (dict_it != std::end(dictionaries))
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if (dict_it->second.origin != config_path)
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throw std::runtime_error{"Overriding dictionary from file " + dict_it->second.origin};
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auto dict_ptr = DictionaryFactory::instance().create(name, *config, key, context);
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/// Если словарь не удалось загрузить.
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if (const auto exception_ptr = dict_ptr->getCreationException())
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{
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const auto failed_dict_it = failed_dictionaries.find(name);
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if (failed_dict_it != std::end(failed_dictionaries))
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{
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failed_dict_it->second = failed_dictionary_info{
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std::move(dict_ptr),
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std::chrono::system_clock::now() + std::chrono::seconds{backoff_initial_sec}
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};
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}
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else
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failed_dictionaries.emplace(name, failed_dictionary_info{
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std::move(dict_ptr),
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std::chrono::system_clock::now() + std::chrono::seconds{backoff_initial_sec}
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});
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std::rethrow_exception(exception_ptr);
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}
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if (!dict_ptr->isCached())
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{
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const auto & lifetime = dict_ptr->getLifetime();
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if (lifetime.min_sec != 0 && lifetime.max_sec != 0)
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{
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std::uniform_int_distribution<std::uint64_t> distribution{
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lifetime.min_sec,
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lifetime.max_sec
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};
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update_times[name] = std::chrono::system_clock::now() +
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std::chrono::seconds{distribution(rnd_engine)};
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}
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}
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const std::lock_guard<std::mutex> lock{dictionaries_mutex};
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/// add new dictionary or update an existing version
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if (dict_it == std::end(dictionaries))
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dictionaries.emplace(name, dictionary_info{
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std::make_shared<MultiVersion<IDictionaryBase>>(dict_ptr.release()),
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config_path
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});
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else
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{
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if (dict_it->second.dict)
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dict_it->second.dict->set(dict_ptr.release());
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else
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dict_it->second.dict = std::make_shared<MultiVersion<IDictionaryBase>>(dict_ptr.release());
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/// erase stored exception on success
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dict_it->second.exception = std::exception_ptr{};
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failed_dictionaries.erase(name);
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}
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}
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catch (...)
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{
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if (!name.empty())
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{
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/// Если для словаря не удалось загрузить данные или даже не удалось инициализировать из конфига.
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/// - всё-равно вставляем информацию в dictionaries, с нулевым указателем dict.
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const std::lock_guard<std::mutex> lock{dictionaries_mutex};
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const auto exception_ptr = std::current_exception();
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const auto dict_it = dictionaries.find(name);
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if (dict_it == std::end(dictionaries))
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dictionaries.emplace(name, dictionary_info{nullptr, config_path, exception_ptr});
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else
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dict_it->second.exception = exception_ptr;
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}
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tryLogCurrentException(log, "Cannot create external dictionary '" + name + "' from config path " + config_path);
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/// propagate exception
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if (throw_on_error)
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throw;
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}
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}
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}
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}
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}
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MultiVersion<IDictionaryBase>::Version ExternalDictionaries::getDictionary(const std::string & name) const
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{
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const std::lock_guard<std::mutex> lock{dictionaries_mutex};
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const auto it = dictionaries.find(name);
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if (it == std::end(dictionaries))
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throw Exception{
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"No such dictionary: " + name,
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ErrorCodes::BAD_ARGUMENTS
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};
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if (!it->second.dict)
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it->second.exception ? std::rethrow_exception(it->second.exception) :
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throw Exception{"No dictionary", ErrorCodes::LOGICAL_ERROR};
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return it->second.dict->get();
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}
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}
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