ClickHouse/src/Interpreters/ErrorLog.h

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#pragma once
#include <Interpreters/SystemLog.h>
#include <Common/ErrorCodes.h>
#include <Common/ThreadPool_fwd.h>
#include <Core/NamesAndTypes.h>
#include <Core/NamesAndAliases.h>
#include <Storages/ColumnsDescription.h>
#include <atomic>
#include <ctime>
namespace DB
{
/** ErrorLog is a log of error values measured at regular time interval.
*/
struct ErrorLogElement
{
time_t event_time{};
ErrorCodes::ErrorCode code{};
ErrorCodes::Value value{};
bool remote{};
static std::string name() { return "ErrorLog"; }
static ColumnsDescription getColumnsDescription();
static NamesAndAliases getNamesAndAliases() { return {}; }
void appendToBlock(MutableColumns & columns) const;
};
class ErrorLog : public SystemLog<ErrorLogElement>
{
using SystemLog<ErrorLogElement>::SystemLog;
public:
void shutdown() override;
/// Launches a background thread to collect errors with interval
void startCollectError(size_t collect_interval_milliseconds_);
/// Stop background thread. Call before shutdown.
void stopCollect();
private:
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struct ValuePair {
UInt64 local = 0;
UInt64 remote = 0;
};
void threadFunction();
std::unique_ptr<ThreadFromGlobalPool> flush_thread;
size_t collect_interval_milliseconds;
std::atomic<bool> is_shutdown_error_thread{false};
};
}