mtr_t::Logging Class Reference

mtr global logging More...

#include <mtr0mtr.h>

Public Types
enum	State : uint32_t { ENABLED , ENABLED_DBLWR , ENABLED_RESTRICT , DISABLED }
	mtr global redo logging state. More...

Public Member Functions
void	init ()
	Initialize logging state at server start up. More...
int	disable (THD *thd)
	Disable mtr redo logging. More...
int	enable (THD *thd)
	Enable mtr redo logging. More...
bool	mark_mtr (size_t index)
	Mark a no-logging mtr to indicate that it would not generate redo log and system is crash unsafe. More...
void	unmark_mtr (size_t index)
	unmark a no logging mtr. More...
uint32_t	get_nolog_flush_loop () const
bool	is_enabled () const
bool	is_disabled () const
bool	dblwr_disabled () const

Static Public Attributes
static constexpr uint32_t	NOLOG_MAX_FLUSH_LOOP = 5

Private Types
using	Shards = Counter::Shards< 128 >

Private Member Functions
int	wait_no_log_mtr (THD *thd)
	Wait till all no-logging mtrs are finished. More...

Private Attributes
std::atomic< State >	m_state
	Global redo logging state. More...
Shards	m_count_nologging_mtr
	Number of no logging mtrs currently running. More...

Detailed Description

mtr global logging

Member Typedef Documentation

Shards

using mtr_t::Logging::Shards = Counter::Shards<128>

private

Member Enumeration Documentation

State

enum mtr_t::Logging::State : uint32_t

mtr global redo logging state.

Enable Logging : [ENABLED] -> [ENABLED_RESTRICT] -> [DISABLED]

Disable Logging : [DISABLED] -> [ENABLED_RESTRICT] -> [ENABLED_DBLWR] -> [ENABLED]

Enumerator
ENABLED
ENABLED_DBLWR
ENABLED_RESTRICT
DISABLED

Member Function Documentation

dblwr_disabled()

bool mtr_t::Logging::dblwr_disabled ( ) const

inline

Returns

true iff we can skip data page double write.

disable()

int mtr_t::Logging::disable

(

THD *

thd

)

Disable mtr redo logging.

Server is crash unsafe without logging.

Parameters

[in]

thd

server connection THD

Returns

mysql error code.

enable()

int mtr_t::Logging::enable

(

THD *

thd

)

Enable mtr redo logging.

Ensure that the server is crash safe before returning.

Parameters

[in]

thd

server connection THD

Returns

mysql error code.

get_nolog_flush_loop()

uint32_t mtr_t::Logging::get_nolog_flush_loop ( ) const

inline

init()

void mtr_t::Logging::init ( void  )

inline

Initialize logging state at server start up.

is_disabled()

bool mtr_t::Logging::is_disabled ( ) const

inline

Returns

true iff redo logging is disabled and new mtrs are not going to generate redo log.

is_enabled()

bool mtr_t::Logging::is_enabled ( ) const

inline

Returns

true iff redo logging is enabled and server is crash safe.

mark_mtr()

bool mtr_t::Logging::mark_mtr ( size_t  index )

inline

Mark a no-logging mtr to indicate that it would not generate redo log and system is crash unsafe.

Returns

true iff logging is disabled and mtr is marked.

unmark_mtr()

void mtr_t::Logging::unmark_mtr ( size_t  index )

inline

unmark a no logging mtr.

wait_no_log_mtr()

int mtr_t::Logging::wait_no_log_mtr ( THD *  thd )

private

Wait till all no-logging mtrs are finished.

Returns

mysql error code.

Member Data Documentation

m_count_nologging_mtr

Shards mtr_t::Logging::m_count_nologging_mtr

private

Number of no logging mtrs currently running.

m_state

std::atomic<State> mtr_t::Logging::m_state

private

Global redo logging state.

NOLOG_MAX_FLUSH_LOOP

constexpr uint32_t mtr_t::Logging::NOLOG_MAX_FLUSH_LOOP = 5

staticconstexpr

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

• storage/innobase/include/mtr0mtr.h
• storage/innobase/mtr/mtr0mtr.cc