dblwr::recv::DBLWR Class Reference

Redo recovery configuration. More...

#include <buf0dblwr.h>

Public Member Functions
	DBLWR () noexcept
	Constructor. More...
	~DBLWR () noexcept
	Destructor. More...
bool	empty () const noexcept
dberr_t	load () noexcept
	Load the doublewrite buffer pages. More...
void	recover (fil_space_t &space) noexcept
	Restore corrupted pages of the tablespace from the double write buffer. More...
const byte *	get_first_page_content_for_recovery (space_id_t space_id, page_size_t page_size, const std::string &file_path, const byte *page_content) noexcept
	Checks if content of the first page provided from the specified space requires recovery from the Double-write Buffer. More...
void	check_missing_tablespaces () noexcept
	Check if some pages from the double write buffer could not be restored because of the missing tablespace IDs. More...
void	recovered () noexcept
	Note that recovery is complete. More...
	DBLWR (const DBLWR &)=delete
	Disable copying. More...
	DBLWR (DBLWR &&)=delete
DBLWR &	operator= (DBLWR &&)=delete
DBLWR &	operator= (const DBLWR &)=delete

Private Attributes
Pages *	m_pages {}
	Pages read from the double write file. More...

Detailed Description

Redo recovery configuration.

Constructor & Destructor Documentation

DBLWR() [1/3]

dblwr::recv::DBLWR::DBLWR ( )

inlineexplicitnoexcept

Constructor.

~DBLWR()

dblwr::recv::DBLWR::~DBLWR ( )

inlinenoexcept

Destructor.

DBLWR() [2/3]

dblwr::recv::DBLWR::DBLWR ( const DBLWR &  )

delete

Disable copying.

DBLWR() [3/3]

dblwr::recv::DBLWR::DBLWR ( DBLWR &&  )

delete

Member Function Documentation

check_missing_tablespaces()

void dblwr::recv::DBLWR::check_missing_tablespaces ( )

inlinenoexcept

Check if some pages from the double write buffer could not be restored because of the missing tablespace IDs.

empty()

bool dblwr::recv::DBLWR::empty ( ) const

inlinenoexcept

Returns

true if empty.

get_first_page_content_for_recovery()

const byte * dblwr::recv::DBLWR::get_first_page_content_for_recovery ( space_id_t  space_id, page_size_t  page_size, const std::string &  file_path, const byte *  page_content  )

inlinenoexcept

Checks if content of the first page provided from the specified space requires recovery from the Double-write Buffer.

If the supplied page_content has a valid not corrupted page, no action is taken. If it is not, then we try to get a non-corrupted copy from the Double-write Buffer. If there are any entries in the Reduced Double-write pages list, we may crash.

Parameters

[in]	space_id	ID of the space to be checked.
[in]	page_size	Page size structure to use for the tablespace page manipulation.
[in]	file_path	Path of a file to be used for error reporting.
[in]	page_content	Content of the first page of the specified tablespace read from the disk. The buffer must hold at least page_size.physical() bytes.

Returns

pointer to page_content if the page does not require recovery, a pointer to page contents from the Double-write Buffer or nullptr if page_content is corrupted, but there's no valid image of it in the Double-write Buffer to restore it from

load()

dberr_t dblwr::recv::DBLWR::load ( )

inlinenoexcept

Load the doublewrite buffer pages.

Doesn't create the doublewrite

Returns

DB_SUCCESS or error code

operator=() [1/2]

DBLWR & dblwr::recv::DBLWR::operator= ( const DBLWR &  )

delete

operator=() [2/2]

DBLWR & dblwr::recv::DBLWR::operator= ( DBLWR &&  )

delete

recover()

void dblwr::recv::DBLWR::recover ( fil_space_t &  space )

inlinenoexcept

Restore corrupted pages of the tablespace from the double write buffer.

Iterates over the previously loaded double write buffer pages, but only ones that are not corrupted, searching for mentions of pages from the specified space, and for each such page checks if tablespace file contains a corrupted version of it and if so, restores it from the backup in image found in double write buffer page, unless this is impossible because the double write buffer page does not contain the body (in reduced, detect-only mode). In case of any errors (IO errors, out of bounds space access) we crash the server.

Parameters

[in]

space

Tablespace to restore pages in.

recovered()

void dblwr::recv::DBLWR::recovered ( )

inlinenoexcept

Note that recovery is complete.

Adjust the file sizes if necessary.

Member Data Documentation

m_pages

Pages* dblwr::recv::DBLWR::m_pages {}

private

Pages read from the double write file.

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

• storage/innobase/include/buf0dblwr.h