Classes
class	DBLWR
	Redo recovery configuration. More...

struct	Page
	Page recovered from the doublewrite buffer. More...

struct	Page_entry
	A record from reduced doublewrite buffer. More...

class	Pages
	Pages recovered from the doublewrite buffer. More...

Functions
static std::pair< std::string, page_no_t >	get_node_and_page_no_for_error (const fil_space_t &space, const page_id_t page_id)
	Helper method to calculate name of file and page offset inside it for reporting errors during Double-write recovery. More...

dberr_t	reduced_load (recv::Pages *pages) noexcept
	Load the doublewrite buffer pages. More...

void	create (Pages *&pages) noexcept
	Create the recovery dblwr data structures. More...

dberr_t	load (Pages *pages) noexcept
	Load the doublewrite buffer pages. More...

void	recover (Pages &pages, 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 (const recv::Pages &pages, space_id_t space_id, page_size_t page_size, const std::string &file_path, const byte *page_content)
	Checks if content of the first page provided from the specified space requires recovery from the Double-write Buffer. More...

void	check_missing_tablespaces (const Pages *pages) noexcept
	Check if some pages from the double write buffer could not be restored because of the missing tablespace IDs. More...

void	destroy (Pages *&pages) noexcept
	Free the recovery dblwr data structures. More...

Function Documentation

◆ check_missing_tablespaces()

void dblwr::recv::check_missing_tablespaces ( const Pages * pages )

noexcept

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

Parameters

[in] pages Pages to check

◆ create()

void dblwr::recv::create ( recv::Pages *& pages )

noexcept

Create the recovery dblwr data structures.

Parameters

[out] pages Pointer to newly created instance

◆ destroy()

void dblwr::recv::destroy ( recv::Pages *& pages )

noexcept

Free the recovery dblwr data structures.

Parameters

[out] pages Instance of the Pages to free.

◆ get_first_page_content_for_recovery()

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

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]	pages	The Double-write pages read from the Double-write Buffer.
[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, 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

◆ get_node_and_page_no_for_error()

static std::pair< std::string, page_no_t > dblwr::recv::get_node_and_page_no_for_error	(	const fil_space_t &	space,
		const page_id_t	page_id
	)

static

Helper method to calculate name of file and page offset inside it for reporting errors during Double-write recovery.

◆ load()

dberr_t dblwr::recv::load ( recv::Pages * pages )

noexcept

Load the doublewrite buffer pages.

Parameters

[in,out] pages For storing the doublewrite pages read from the double write buffer

Returns: DB_SUCCESS or error code

◆ recover()

void dblwr::recv::recover	(	recv::Pages &	pages,
		fil_space_t &	space
	)

noexcept

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

Iterates over the supplied 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,out]	pages	Pages from the doublewrite buffer
[in]	space	Tablespace to restore pages in.

◆ reduced_load()

dberr_t dblwr::recv::reduced_load ( recv::Pages * pages )

noexcept

Load the doublewrite buffer pages.

Parameters

[in,out] pages For storing the doublewrite pages read from the double write buffer

Returns: DB_SUCCESS or error code

Classes

Functions

Function Documentation

◆ check_missing_tablespaces()

◆ create()

◆ destroy()

◆ get_first_page_content_for_recovery()

◆ get_node_and_page_no_for_error()

◆ load()

◆ recover()

◆ reduced_load()