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#include <Interpreters/MetricLog.h>
#include <Common/ThreadPool.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeDateTime64.h>
namespace DB
{
NamesAndTypesList MetricLogElement::getNamesAndTypes()
{
NamesAndTypesList columns_with_type_and_name;
columns_with_type_and_name.emplace_back("event_date", std::make_shared<DataTypeDate>());
columns_with_type_and_name.emplace_back("event_time", std::make_shared<DataTypeDateTime>());
columns_with_type_and_name.emplace_back("event_time_microseconds", std::make_shared<DataTypeDateTime64>(6));
for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
{
std::string name;
name += "ProfileEvent_";
name += ProfileEvents::getName(ProfileEvents::Event(i));
columns_with_type_and_name.emplace_back(std::move(name), std::make_shared<DataTypeUInt64>());
}
for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
{
std::string name;
name += "CurrentMetric_";
name += CurrentMetrics::getName(CurrentMetrics::Metric(i));
columns_with_type_and_name.emplace_back(std::move(name), std::make_shared<DataTypeInt64>());
}
return columns_with_type_and_name;
}
void MetricLogElement::appendToBlock(MutableColumns & columns) const
{
size_t column_idx = 0;
columns[column_idx++]->insert(DateLUT::instance().toDayNum(event_time).toUnderType());
columns[column_idx++]->insert(event_time);
columns[column_idx++]->insert(event_time_microseconds);
for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
columns[column_idx++]->insert(profile_events[i]);
for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
columns[column_idx++]->insert(current_metrics[i].toUnderType());
}
void MetricLog::startCollectMetric(size_t collect_interval_milliseconds_)
{
collect_interval_milliseconds = collect_interval_milliseconds_;
is_shutdown_metric_thread = false;
metric_flush_thread = std::make_unique<ThreadFromGlobalPool>([this] { metricThreadFunction(); });
}
void MetricLog::stopCollectMetric()
{
bool old_val = false;
if (!is_shutdown_metric_thread.compare_exchange_strong(old_val, true))
return;
if (metric_flush_thread)
metric_flush_thread->join();
}
void MetricLog::shutdown()
{
stopCollectMetric();
stopFlushThread();
}
void MetricLog::metricThreadFunction()
{
auto desired_timepoint = std::chrono::system_clock::now();
/// For differentiation of ProfileEvents counters.
std::vector<ProfileEvents::Count> prev_profile_events(ProfileEvents::end());
while (!is_shutdown_metric_thread)
{
try
{
const auto current_time = std::chrono::system_clock::now();
MetricLogElement elem;
elem.event_time = std::chrono::system_clock::to_time_t(current_time);
elem.event_time_microseconds = timeInMicroseconds(current_time);
elem.profile_events.resize(ProfileEvents::end());
for (ProfileEvents::Event i = ProfileEvents::Event(0), end = ProfileEvents::end(); i < end; ++i)
{
const ProfileEvents::Count new_value = ProfileEvents::global_counters[i].load(std::memory_order_relaxed);
auto & old_value = prev_profile_events[i];
elem.profile_events[i] = new_value - old_value;
old_value = new_value;
}
elem.current_metrics.resize(CurrentMetrics::end());
for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
{
elem.current_metrics[i] = CurrentMetrics::values[i];
}
this->add(std::move(elem));
/// We will record current time into table but align it to regular time intervals to avoid time drift.
/// We may drop some time points if the server is overloaded and recording took too much time.
while (desired_timepoint <= current_time)
desired_timepoint += std::chrono::milliseconds(collect_interval_milliseconds);
std::this_thread::sleep_until(desired_timepoint);
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
}
}
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