ClickHouse/dbms/src/Interpreters/MetricLog.cpp

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#include <Interpreters/MetricLog.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
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namespace DB
{
Block MetricLogElement::createBlock()
{
ColumnsWithTypeAndName columns_with_type_and_name;
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columns_with_type_and_name.emplace_back(std::make_shared<DataTypeDate>(), "event_date");
columns_with_type_and_name.emplace_back(std::make_shared<DataTypeDateTime>(), "event_time");
columns_with_type_and_name.emplace_back(std::make_shared<DataTypeUInt64>(), "milliseconds");
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for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
{
std::string name;
name += "ProfileEvent_";
name += ProfileEvents::getName(ProfileEvents::Event(i));
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columns_with_type_and_name.emplace_back(std::make_shared<DataTypeUInt64>(), std::move(name));
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}
for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
{
std::string name;
name += "CurrentMetric_";
name += CurrentMetrics::getName(ProfileEvents::Event(i));
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columns_with_type_and_name.emplace_back(std::make_shared<DataTypeInt64>(), std::move(name));
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}
return Block(columns_with_type_and_name);
}
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void MetricLogElement::appendToBlock(Block & block) const
{
MutableColumns columns = block.mutateColumns();
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size_t column_idx = 0;
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columns[column_idx++]->insert(DateLUT::instance().toDayNum(event_time));
columns[column_idx++]->insert(event_time);
columns[column_idx++]->insert(milliseconds);
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for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
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columns[column_idx++]->insert(profile_events[i]);
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for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
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columns[column_idx++]->insert(current_metrics[i]);
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}
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void MetricLog::startCollectMetric(size_t collect_interval_milliseconds_)
{
collect_interval_milliseconds = collect_interval_milliseconds_;
is_shutdown_metric_thread = false;
metric_flush_thread = ThreadFromGlobalPool([this] { metricThreadFunction(); });
}
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void MetricLog::stopCollectMetric()
{
bool old_val = false;
if (!is_shutdown_metric_thread.compare_exchange_strong(old_val, true))
return;
metric_flush_thread.join();
}
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inline UInt64 time_in_milliseconds(std::chrono::time_point<std::chrono::system_clock> timepoint)
{
return std::chrono::duration_cast<std::chrono::milliseconds>(timepoint.time_since_epoch()).count();
}
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inline UInt64 time_in_seconds(std::chrono::time_point<std::chrono::system_clock> timepoint)
{
return std::chrono::duration_cast<std::chrono::seconds>(timepoint.time_since_epoch()).count();
}
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void MetricLog::metricThreadFunction()
{
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auto desired_timepoint = std::chrono::system_clock::now();
/// For differentiation of ProfileEvents counters.
std::vector<ProfileEvents::Count> prev_profile_events(ProfileEvents::end());
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while (!is_shutdown_metric_thread)
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{
try
{
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const auto current_time = std::chrono::system_clock::now();
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MetricLogElement elem;
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elem.event_time = std::chrono::system_clock::to_time_t(current_time);
elem.milliseconds = time_in_milliseconds(current_time) - time_in_seconds(current_time) * 1000;
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elem.profile_events.resize(ProfileEvents::end());
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for (size_t i = 0, end = ProfileEvents::end(); i < end; ++i)
{
const ProfileEvents::Count new_value = ProfileEvents::global_counters[i].load(std::memory_order_relaxed);
UInt64 & old_value = prev_profile_events[i];
elem.profile_events[i] = new_value - old_value;
old_value = new_value;
}
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elem.current_metrics.resize(CurrentMetrics::end());
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for (size_t i = 0, end = CurrentMetrics::end(); i < end; ++i)
{
elem.current_metrics[i] = CurrentMetrics::values[i];
}
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this->add(elem);
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/// 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)
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desired_timepoint += std::chrono::milliseconds(collect_interval_milliseconds);
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std::this_thread::sleep_until(desired_timepoint);
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}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
}
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}