Namespaces
namespace	recv

namespace	v1

Classes
struct	Buffer
	IO buffer in UNIV_PAGE_SIZE units and aligned on UNIV_PAGE_SIZE. More...

struct	File

struct	Mode

struct	Reduced_entry
	When –innodb-doublewrite=DETECT_ONLY, page contents are not written to the dblwr buffer. More...

Functions
bool	is_odd (uint32_t val)

std::ostream &	operator<< (std::ostream &out, const File &obj) noexcept
	Overload the global output operator to work with dblwr::File type. More...

static bool	is_encrypted_page (const byte *page) noexcept

bool	has_encrypted_pages () noexcept
	Check if the dblwr files contain encrypted pages. More...

dberr_t	open () noexcept
	Startup the background thread(s) and create the instance. More...

dberr_t	enable_reduced () noexcept
	Enable the doublewrite reduced mode by creating the necessary dblwr files and in-memory structures. More...

dberr_t	reduced_open () noexcept
	Check and open the reduced doublewrite files if necessary. More...

void	close () noexcept
	Shutdown the background thread and destroy the instance. More...

void	force_flush (buf_flush_t flush_type, uint32_t buf_pool_index) noexcept
	Force a write of all pages in the queue. More...

void	force_flush_all () noexcept
	Force a write of all pages in all dblwr segments (reduced or regular) This is used only when switching the doublewrite mode dynamically. More...

dberr_t	write (buf_flush_t flush_type, buf_page_t *bpage, bool sync) noexcept
	Writes a page to the doublewrite buffer on disk, syncs it, then writes the page to the datafile. More...

file::Block *	get_encrypted_frame (buf_page_t *bpage, IORequest &type) noexcept
	Obtain the encrypted frame and store it in bpage->m_io_frame. More...

void	write_complete (buf_page_t *bpage, buf_flush_t flush_type) noexcept
	Updates the double write buffer when a write request is completed. More...

void	reset_files () noexcept
	Delete or adjust the dblwr file size if required. More...

bool	is_enabled ()
	Check if doublewrite is enabled. More...

bool	is_reduced ()
	Check if the doublewrite mode is detect-only (aka reduced). More...

bool	is_disabled ()
	Check if the doublewrite mode is disabled. More...

const char *	to_string (ulong mode)

void	set ()
	Toggle the doublewrite buffer. More...

Variables
std::string	dir {"."}
	Double write files location. More...

ulong	n_files {1}
	Number of files to use for the double write buffer. More...

ulong	batch_size {}
	Maximum number of pages to write in one batch. More...

ulong	n_pages {64}
	Number of pages per doublewrite thread/segment. More...

ulong	g_mode {Mode::ON}
	DBLWR mode. More...

bool	is_reduced_inited = false
	true if DETECT_ONLY (aka reduced) mode is inited More...

static page_no_t	LEGACY_PAGE1
	Legacy dblwr buffer first segment page number. More...

static page_no_t	LEGACY_PAGE2
	Legacy dblwr buffer second segment page number. More...

page_id_t	Force_crash {UINT32_UNDEFINED, UINT32_UNDEFINED}
	Crash the server after writing this page to the data file. More...

const uint32_t	REDUCED_BATCH_PAGE_SIZE = 8192

const uint32_t	RB_BATCH_ID_SIZE = 4

const uint32_t	RB_CHECKSUM_SIZE = 4

const uint32_t	RB_DATA_LEN_SIZE = 2

const uint32_t	RB_BATCH_TYPE_SIZE = 1

const uint32_t	RB_UNUSED_BYTES_SIZE = 9

constexpr const uint32_t	RB_OFF_BATCH_ID = 0

constexpr const uint32_t	RB_OFF_CHECKSUM = RB_OFF_BATCH_ID + RB_BATCH_ID_SIZE

constexpr const uint32_t	RB_OFF_DATA_LEN = RB_OFF_CHECKSUM + RB_CHECKSUM_SIZE

constexpr const uint32_t	RB_OFF_BATCH_TYPE = RB_OFF_DATA_LEN + RB_DATA_LEN_SIZE

constexpr const uint32_t	RB_OFF_UNUSED = RB_OFF_BATCH_TYPE + RB_BATCH_TYPE_SIZE

constexpr const uint32_t	REDUCED_HEADER_SIZE

constexpr const uint32_t	REDUCED_ENTRY_SIZE

constexpr const uint32_t	REDUCED_DATA_SIZE

constexpr const uint32_t	REDUCED_MAX_ENTRIES

Function Documentation

◆ close()

void dblwr::close ( )

noexcept

Shutdown the background thread and destroy the instance.

◆ enable_reduced()

dberr_t dblwr::enable_reduced ( )

noexcept

Enable the doublewrite reduced mode by creating the necessary dblwr files and in-memory structures.

Returns: DB_SUCCESS or error code

◆ force_flush()

void dblwr::force_flush	(	buf_flush_t	flush_type,
		uint32_t	buf_pool_index
	)

noexcept

Force a write of all pages in the queue.

Parameters

[in]	flush_type	FLUSH LIST or LRU_LIST flush request.
[in]	buf_pool_index	Buffer pool instance for which called.

◆ force_flush_all()

void dblwr::force_flush_all ( )

noexcept

Force a write of all pages in all dblwr segments (reduced or regular) This is used only when switching the doublewrite mode dynamically.

◆ get_encrypted_frame()

file::Block * dblwr::get_encrypted_frame	(	buf_page_t *	bpage,
		IORequest &	type
	)

noexcept

Obtain the encrypted frame and store it in bpage->m_io_frame.

Parameters

[in,out]	bpage	the buffer page containing the unencrypted frame.
[in,out]	type	i/o operation type.

Returns: the memory block containing the compressed + encrypted frame.

◆ has_encrypted_pages()

bool dblwr::has_encrypted_pages ( )

noexcept

Check if the dblwr files contain encrypted pages.

Returns: true if dblwr file contains any encrypted pages, false if dblwr file contains no encrypted pages.

◆ is_disabled()

bool dblwr::is_disabled ( )

inline

Check if the doublewrite mode is disabled.

Returns: true if dblwr mode is OFF.

◆ is_enabled()

bool dblwr::is_enabled ( )

inline

Check if doublewrite is enabled.

Returns: true if dblwr mode is ON, DETECT_ONLY, DETECT_AND_RECOVER; false if dblwr mode is OFF.

◆ is_encrypted_page()

static bool dblwr::is_encrypted_page ( const byte * page )

staticnoexcept

◆ is_odd()

bool dblwr::is_odd ( uint32_t val )

inline

◆ is_reduced()

bool dblwr::is_reduced ( )

inline

Check if the doublewrite mode is detect-only (aka reduced).

Returns: true if dblwr mode is DETECT_ONLY.

◆ open()

dberr_t dblwr::open ( )

noexcept

Startup the background thread(s) and create the instance.

Returns: DB_SUCCESS or error code

◆ operator<<()

std::ostream & dblwr::operator<<	(	std::ostream &	out,
		const File &	obj
	)

inlinenoexcept

Overload the global output operator to work with dblwr::File type.

Parameters

[in]	out	output stream into which the object is printed.
[in]	obj	An object to type dblwr::File.

Returns: the output stream.

◆ reduced_open()

dberr_t dblwr::reduced_open ( )

noexcept

Check and open the reduced doublewrite files if necessary.

Returns: DB_SUCCESS or error code

◆ reset_files()

void dblwr::reset_files ( )

noexcept

Delete or adjust the dblwr file size if required.

◆ set()

void dblwr::set ( )

Toggle the doublewrite buffer.

◆ to_string()

const char * dblwr::to_string ( ulong mode )

Returns: string version of dblwr numeric values

Parameters

[in] mode dblwr ENUM

◆ write()

dberr_t dblwr::write	(	buf_flush_t	flush_type,
		buf_page_t *	bpage,
		bool	sync
	)

noexcept

Writes a page to the doublewrite buffer on disk, syncs it, then writes the page to the datafile.

Parameters

[in]	flush_type	Flush type
[in]	bpage	Buffer block to write
[in]	sync	True if sync IO requested

Returns: DB_SUCCESS or error code

◆ write_complete()

void dblwr::write_complete	(	buf_page_t *	bpage,
		buf_flush_t	flush_type
	)

noexcept

Updates the double write buffer when a write request is completed.

Parameters

[in]	bpage	Block that has just been writtent to disk.
[in]	flush_type	Flush type that triggered the write.

Variable Documentation

◆ batch_size

ulong dblwr::batch_size {}

Maximum number of pages to write in one batch.

◆ dir

std::string dblwr::dir {"."}

Double write files location.

◆ Force_crash

page_id_t dblwr::Force_crash {UINT32_UNDEFINED, UINT32_UNDEFINED}

Crash the server after writing this page to the data file.

◆ g_mode

ulong dblwr::g_mode {Mode::ON}

DBLWR mode.

◆ is_reduced_inited

bool dblwr::is_reduced_inited = false

true if DETECT_ONLY (aka reduced) mode is inited

◆ LEGACY_PAGE1

page_no_t dblwr::LEGACY_PAGE1

static

Legacy dblwr buffer first segment page number.

◆ LEGACY_PAGE2

page_no_t dblwr::LEGACY_PAGE2

static

Legacy dblwr buffer second segment page number.

◆ n_files

ulong dblwr::n_files {1}

Number of files to use for the double write buffer.

It must be <= than the number of buffer pool instances.

◆ n_pages

ulong dblwr::n_pages {64}

Number of pages per doublewrite thread/segment.

◆ RB_BATCH_ID_SIZE

const uint32_t dblwr::RB_BATCH_ID_SIZE = 4

◆ RB_BATCH_TYPE_SIZE

const uint32_t dblwr::RB_BATCH_TYPE_SIZE = 1

◆ RB_CHECKSUM_SIZE

const uint32_t dblwr::RB_CHECKSUM_SIZE = 4

◆ RB_DATA_LEN_SIZE

const uint32_t dblwr::RB_DATA_LEN_SIZE = 2

◆ RB_OFF_BATCH_ID

constexpr const uint32_t dblwr::RB_OFF_BATCH_ID = 0

constexpr

◆ RB_OFF_BATCH_TYPE

constexpr const uint32_t dblwr::RB_OFF_BATCH_TYPE = RB_OFF_DATA_LEN + RB_DATA_LEN_SIZE

constexpr

◆ RB_OFF_CHECKSUM

constexpr const uint32_t dblwr::RB_OFF_CHECKSUM = RB_OFF_BATCH_ID + RB_BATCH_ID_SIZE

constexpr

◆ RB_OFF_DATA_LEN

constexpr const uint32_t dblwr::RB_OFF_DATA_LEN = RB_OFF_CHECKSUM + RB_CHECKSUM_SIZE

constexpr

◆ RB_OFF_UNUSED

constexpr const uint32_t dblwr::RB_OFF_UNUSED = RB_OFF_BATCH_TYPE + RB_BATCH_TYPE_SIZE

constexpr

◆ RB_UNUSED_BYTES_SIZE

const uint32_t dblwr::RB_UNUSED_BYTES_SIZE = 9

◆ REDUCED_BATCH_PAGE_SIZE

const uint32_t dblwr::REDUCED_BATCH_PAGE_SIZE = 8192

◆ REDUCED_DATA_SIZE

constexpr const uint32_t dblwr::REDUCED_DATA_SIZE

constexpr

Initial value:

=

REDUCED_BATCH_PAGE_SIZE - REDUCED_HEADER_SIZE

dblwr::REDUCED_BATCH_PAGE_SIZE

const uint32_t REDUCED_BATCH_PAGE_SIZE

Definition: buf0dblwr.h:233

dblwr::REDUCED_HEADER_SIZE

constexpr const uint32_t REDUCED_HEADER_SIZE

Definition: buf0dblwr.h:252

◆ REDUCED_ENTRY_SIZE

constexpr const uint32_t dblwr::REDUCED_ENTRY_SIZE

constexpr

Initial value:

=

sizeof(space_id_t) + sizeof(page_no_t) + sizeof(lsn_t)

space_id_t

uint32_t space_id_t

Tablespace identifier.

Definition: api0api.h:48

page_no_t

uint32_t page_no_t

Page number.

Definition: api0api.h:46

lsn_t

uint64_t lsn_t

Type used for all log sequence number storage and arithmetic.

Definition: log0types.h:63

◆ REDUCED_HEADER_SIZE

constexpr const uint32_t dblwr::REDUCED_HEADER_SIZE

constexpr

Initial value:

=
    RB_BATCH_ID_SIZE     
    + RB_CHECKSUM_SIZE   
    + RB_DATA_LEN_SIZE   
    + RB_BATCH_TYPE_SIZE 
    + 9

◆ REDUCED_MAX_ENTRIES

constexpr const uint32_t dblwr::REDUCED_MAX_ENTRIES

constexpr

Initial value:

=

REDUCED_DATA_SIZE / REDUCED_ENTRY_SIZE

dblwr::REDUCED_DATA_SIZE

constexpr const uint32_t REDUCED_DATA_SIZE

Definition: buf0dblwr.h:262

dblwr::REDUCED_ENTRY_SIZE

constexpr const uint32_t REDUCED_ENTRY_SIZE

Definition: buf0dblwr.h:259

Namespaces

Classes

Functions

Variables

Function Documentation

◆ close()

◆ enable_reduced()

◆ force_flush()

◆ force_flush_all()

◆ get_encrypted_frame()

◆ has_encrypted_pages()

◆ is_disabled()

◆ is_enabled()

◆ is_encrypted_page()

◆ is_odd()

◆ is_reduced()

◆ open()

◆ operator<<()

◆ reduced_open()

◆ reset_files()

◆ set()

◆ to_string()

◆ write()

◆ write_complete()

Variable Documentation

◆ batch_size

◆ dir

◆ Force_crash

◆ g_mode

◆ is_reduced_inited

◆ LEGACY_PAGE1

◆ LEGACY_PAGE2

◆ n_files

◆ n_pages

◆ RB_BATCH_ID_SIZE

◆ RB_BATCH_TYPE_SIZE

◆ RB_CHECKSUM_SIZE

◆ RB_DATA_LEN_SIZE

◆ RB_OFF_BATCH_ID

◆ RB_OFF_BATCH_TYPE

◆ RB_OFF_CHECKSUM

◆ RB_OFF_DATA_LEN

◆ RB_OFF_UNUSED

◆ RB_UNUSED_BYTES_SIZE

◆ REDUCED_BATCH_PAGE_SIZE

◆ REDUCED_DATA_SIZE

◆ REDUCED_ENTRY_SIZE

◆ REDUCED_HEADER_SIZE

◆ REDUCED_MAX_ENTRIES