ClickHouse/dbms/src/Interpreters/EmbeddedDictionaries.cpp

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#include <common/logger_useful.h>
#include <Poco/Util/Application.h>
#include <Interpreters/EmbeddedDictionaries.h>
#include <Dictionaries/Embedded/RegionsHierarchies.h>
#include <Dictionaries/Embedded/TechDataHierarchy.h>
#include <Dictionaries/Embedded/RegionsNames.h>
#include <Common/setThreadName.h>
#include <Common/Exception.h>
#include <Common/config.h>
namespace DB
{
void EmbeddedDictionaries::handleException(const bool throw_on_error) const
{
const auto exception_ptr = std::current_exception();
tryLogCurrentException(log, "Cannot load dictionary! You must resolve this manually.");
if (throw_on_error)
std::rethrow_exception(exception_ptr);
}
template <typename Dictionary>
bool EmbeddedDictionaries::reloadDictionary(MultiVersion<Dictionary> & dictionary, const bool throw_on_error)
{
if (Dictionary::isConfigured() && (!is_fast_start_stage || !dictionary.get()))
{
try
{
auto new_dictionary = std::make_unique<Dictionary>();
new_dictionary->reload();
dictionary.set(new_dictionary.release());
}
catch (...)
{
handleException(throw_on_error);
return false;
}
}
return true;
}
bool EmbeddedDictionaries::reloadImpl(const bool throw_on_error)
{
2017-04-02 17:37:49 +00:00
/** If you can not update the directories, then despite this, do not throw an exception (use the old directories).
* If there are no old correct directories, then when using functions that depend on them,
* will throw an exception.
* An attempt is made to load each directory separately.
*/
LOG_INFO(log, "Loading dictionaries.");
bool was_exception = false;
#if USE_MYSQL
if (!reloadDictionary<TechDataHierarchy>(tech_data_hierarchy, throw_on_error))
was_exception = true;
#endif
if (!reloadDictionary<RegionsHierarchies>(regions_hierarchies, throw_on_error))
was_exception = true;
if (!reloadDictionary<RegionsNames>(regions_names, throw_on_error))
was_exception = true;
if (!was_exception)
LOG_INFO(log, "Loaded dictionaries.");
return !was_exception;
}
void EmbeddedDictionaries::reloadPeriodically()
{
setThreadName("DictReload");
while (true)
{
if (destroy.tryWait(cur_reload_period * 1000))
return;
if (reloadImpl(false))
{
/// Success
cur_reload_period = reload_period;
is_fast_start_stage = false;
}
if (is_fast_start_stage)
{
cur_reload_period = std::min(reload_period, 2 * cur_reload_period); /// exponentially increase delay
is_fast_start_stage = cur_reload_period < reload_period; /// leave fast start state
}
}
}
EmbeddedDictionaries::EmbeddedDictionaries(const bool throw_on_error, const int reload_period_)
: reload_period(reload_period_), log(&Logger::get("EmbeddedDictionaries"))
{
reloadImpl(throw_on_error);
reloading_thread = std::thread([this] { reloadPeriodically(); });
}
EmbeddedDictionaries::EmbeddedDictionaries(const bool throw_on_error)
: EmbeddedDictionaries(throw_on_error,
Poco::Util::Application::instance().config().getInt("builtin_dictionaries_reload_interval", 3600))
{}
EmbeddedDictionaries::~EmbeddedDictionaries()
{
destroy.set();
reloading_thread.join();
}
}