Error_log_throttle Class Reference

#include <log.h>

Inheritance diagram for Error_log_throttle:

Public Member Functions
	Error_log_throttle (ulong window_usecs, loglevel lvl, uint errcode, const char *subsystem, const char *msg)
bool	flush ()
	Prepare and print a summary of suppressed lines to log. More...
bool	log ()
	Top-level function. More...

Private Member Functions
void	print_summary (ulong suppressed)
	Actually print the prepared summary to log. More...

Private Attributes
loglevel	ll
uint	err_code
const char *	subsys

Additional Inherited Members
Static Public Attributes inherited from Log_throttle
static const ulong	LOG_THROTTLE_WINDOW_SIZE = 60000000
	We're rate-limiting messages per minute; 60,000,000 microsecs = 60s Debugging is less tedious with a window in the region of 5000000. More...
Protected Member Functions inherited from Log_throttle
void	new_window (ulonglong now)
	Start a new window. More...
bool	inc_log_count (ulong rate)
	Increase count of logs we're handling. More...
bool	in_window (ulonglong now) const
	Check whether we're still in the current window. More...
ulong	prepare_summary (ulong rate)
	Prepare a summary of suppressed lines for logging. More...
	Log_throttle (ulong window_usecs, const char *msg)
Protected Attributes inherited from Log_throttle
const char *	summary_template
	Template for the summary line. More...

Constructor & Destructor Documentation

Error_log_throttle()

Error_log_throttle::Error_log_throttle ( ulong  window_usecs, loglevel  lvl, uint  errcode, const char *  subsystem, const char *  msg  )

inline

Parameters

window_usecs	... in this many micro-seconds (see Log_throttle)
lvl	severity of the incident (error, warning, info)
errcode	MySQL error code (e.g. ER_STARTUP)
subsystem	subsystem tag, or nullptr for none
msg	use this message template containing lu as only non-literal (for "number of suppressed events", see Log_throttle)

Member Function Documentation

flush()

bool Error_log_throttle::flush

(

)

Prepare and print a summary of suppressed lines to log.

(For now, slow query log.) The summary states the number of queries that were qualified for inclusion in the log, but were not printed because of the rate-limiting.

Return values

false	Logging was not suppressed, no summary needed.
true	Logging was suppressed; a summary was printed.

log()

bool Error_log_throttle::log

(

)

Top-level function.

Return values

true	Logging should be suppressed.
false	Logging should not be suppressed.

print_summary()

void Error_log_throttle::print_summary ( ulong  suppressed )

inlineprivate

Actually print the prepared summary to log.

Member Data Documentation

err_code

uint Error_log_throttle::err_code

private

ll

loglevel Error_log_throttle::ll

private

subsys

const char* Error_log_throttle::subsys

private

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The documentation for this class was generated from the following files:

• sql/log.h
• sql/log.cc