Pages recovered from the doublewrite buffer. More...

Public Types
using	Buffers = std::vector< Page , ut::allocator< Page > >

using	Page_entries = std::vector< Page_entry, ut::allocator< Page_entry > >

Public Member Functions
	Pages ()
	Default constructor. More...

	~Pages () noexcept
	Destructor. More...

void	add (page_no_t page_no, const byte *page, uint32_t n_bytes) noexcept
	Add a page frame to the doublewrite recovery buffer. More...

void	add_entry (Page_entry &pg_entry)
	Add a page entry from reduced doublewrite buffer to vector. More...

const byte *	find (const page_id_t &page_id) const noexcept
	Find a doublewrite copy of a page. More...

bool	is_recovered (const page_id_t &page_id) const noexcept

bool	dblwr_recover_page (page_no_t dblwr_page_no, fil_space_t space, page_no_t page_no, byte page) noexcept
	Recover a page from the doublewrite buffer. More...

std::tuple< bool, bool >	is_actual_page_corrupted (fil_space_t *space, page_id_t &page_id)
	Checks if page in tablespace is corrupted or an all-zero page. More...

std::tuple< bool, lsn_t >	find_entry (const page_id_t &page_id) const noexcept
	Check if page was logged in reduced doublewrite buffer mode, if so also return the page LSN. More...

void	recover (fil_space_t *space) noexcept
	Recover double write buffer pages. More...

void	check_missing_tablespaces () const noexcept
	Check if some pages could be restored because of missing tablespace IDs. More...

Buffers &	get_pages () noexcept
	Object the vector of pages. More...

Private Member Functions
void	reduced_recover (fil_space_t *space) noexcept
	Check if page is logged in reduced doublewrite buffer. More...

	Pages (const Pages &)=delete

	Pages (const Pages &&)=delete

Pages &	operator= (Pages &&)=delete

Pages &	operator= (const Pages &)=delete

Private Attributes
Buffers	m_pages
	Recovered doublewrite buffer page frames. More...

Page_entries	m_page_entries
	Page entries from reduced doublewrite buffer. More...

Detailed Description

Pages recovered from the doublewrite buffer.

Member Typedef Documentation

◆ Buffers

using dblwr::recv::Pages::Buffers = std::vector<Page *, ut::allocator<Page *> >

◆ Page_entries

using dblwr::recv::Pages::Page_entries = std::vector<Page_entry, ut::allocator<Page_entry> >

Constructor & Destructor Documentation

◆ Pages() [1/3]

dblwr::recv::Pages::Pages ( )

inline

Default constructor.

◆ ~Pages()

dblwr::recv::Pages::~Pages ( )

inlinenoexcept

Destructor.

◆ Pages() [2/3]

dblwr::recv::Pages::Pages ( const Pages & )

privatedelete

◆ Pages() [3/3]

dblwr::recv::Pages::Pages ( const Pages && )

privatedelete

Member Function Documentation

◆ add()

void recv::Pages::add	(	page_no_t	page_no,
		const byte *	page,
		uint32_t	n_bytes
	)

noexcept

Add a page frame to the doublewrite recovery buffer.

Parameters

[in]	page_no	Page number in the doublewrite buffer
[in]	page	Page contents
[in]	n_bytes	Size in bytes

◆ add_entry()

void dblwr::recv::Pages::add_entry ( Page_entry & pg_entry )

inline

Add a page entry from reduced doublewrite buffer to vector.

Parameters

[in] pg_entry Reduced doublewrite buffer entry

◆ check_missing_tablespaces()

void recv::Pages::check_missing_tablespaces ( ) const

noexcept

Check if some pages could be restored because of missing tablespace IDs.

◆ dblwr_recover_page()

bool dblwr::recv::Pages::dblwr_recover_page	(	page_no_t	dblwr_page_no,
		fil_space_t *	space,
		page_no_t	page_no,
		byte *	page
	)

noexcept

Recover a page from the doublewrite buffer.

Parameters

[in]	dblwr_page_no	Page number if the doublewrite buffer
[in]	space	Tablespace the page belongs to
[in]	page_no	Page number in the tablespace
[in]	page	Data to write to <space, page_no>

Returns: true if page was restored to the tablespace

◆ find()

const byte * recv::Pages::find ( const page_id_t & page_id ) const

noexcept

Find a doublewrite copy of a page.

Parameters

[in] page_id Page number to lookup

Returns: page frame

Return values

nullptr if no page was found

◆ find_entry()

std::tuple< bool, lsn_t > dblwr::recv::Pages::find_entry ( const page_id_t & page_id ) const

inlinenoexcept

Check if page was logged in reduced doublewrite buffer mode, if so also return the page LSN.

Note if there are multiple entries of same page, we return the max_LSN of all entries.

Parameters

[in] page_id Page number to lookup

Return values

tuple<0> - true if the page is found in reduced doublewrite buffer, false if no page was found tuple<1> - if tuple<0> is true (ie page found in reduced dblwr mode), then return the max page LSN

◆ get_pages()

Buffers & dblwr::recv::Pages::get_pages ( )

inlinenoexcept

Object the vector of pages.

Returns: the vector of pages.

◆ is_actual_page_corrupted()

std::tuple< bool, bool > dblwr::recv::Pages::is_actual_page_corrupted	(	fil_space_t *	space,
		page_id_t &	page_id
	)

Checks if page in tablespace is corrupted or an all-zero page.

Parameters

[in]	space	Tablespace object
[in]	page_id	Page number to check for corruption

Returns: tuple<0> - true if corrupted tuple<1> - true if the page is all zero page

◆ is_recovered()

bool recv::Pages::is_recovered ( const page_id_t & page_id ) const

noexcept

Returns: true if page is recovered from the regular doublewrite buffer

Parameters

[in] page_id Page number to lookup

◆ operator=() [1/2]

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

privatedelete

◆ operator=() [2/2]

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

privatedelete

◆ recover()

void recv::Pages::recover ( fil_space_t * space )

noexcept

Recover double write buffer pages.

Parameters

[in] space Tablespace pages to recover, if set to nullptr then try and recovery all.

◆ reduced_recover()

void recv::Pages::reduced_recover ( fil_space_t * space )

privatenoexcept

Check if page is logged in reduced doublewrite buffer.

We cannot recover page because the entire page is not logged only an entry of space_id, page_id, LSN is logged. So we abort the server. It is expected that the user restores from backup

Parameters

[in] space Tablespace pages to check in reduced dblwr, if set to nullptr then try and recovery all.

Member Data Documentation

◆ m_page_entries

Page_entries dblwr::recv::Pages::m_page_entries

private

Page entries from reduced doublewrite buffer.

◆ m_pages

Buffers dblwr::recv::Pages::m_pages

private

Recovered doublewrite buffer page frames.

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

storage/innobase/buf/buf0dblwr.cc

Public Types

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

◆ Buffers

◆ Page_entries

Constructor & Destructor Documentation

◆ Pages() [1/3]

◆ ~Pages()

◆ Pages() [2/3]

◆ Pages() [3/3]

Member Function Documentation

◆ add()

◆ add_entry()

◆ check_missing_tablespaces()

◆ dblwr_recover_page()

◆ find()

◆ find_entry()

◆ get_pages()

◆ is_actual_page_corrupted()

◆ is_recovered()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ recover()

◆ reduced_recover()

Member Data Documentation

◆ m_page_entries

◆ m_pages