Log row updates with a before image. More...

#include <log_event.h>

Inheritance diagram for Update_rows_log_event:

Public Types
enum	{ TYPE_CODE = mysql::binlog::event::UPDATE_ROWS_EVENT }

Public Types inherited from Rows_log_event
enum	row_lookup_mode { ROW_LOOKUP_UNDEFINED = 0 , ROW_LOOKUP_NOT_NEEDED = 1 , ROW_LOOKUP_INDEX_SCAN = 2 , ROW_LOOKUP_TABLE_SCAN = 3 , ROW_LOOKUP_HASH_SCAN = 4 }

enum	enum_error { ERR_OPEN_FAILURE = -1 , ERR_OK = 0 , ERR_TABLE_LIMIT_EXCEEDED = 1 , ERR_OUT_OF_MEM = 2 , ERR_BAD_TABLE_DEF = 3 , ERR_RBR_TO_SBR = 4 }
	Enumeration of the errors that can be returned. More...

enum	{ RLE_NO_FLAGS = 0U }

typedef uint16	flag_set

Public Types inherited from mysql::binlog::event::Rows_event
enum	enum_flag { STMT_END_F = (1U << 0) , NO_FOREIGN_KEY_CHECKS_F = (1U << 1) , RELAXED_UNIQUE_CHECKS_F = (1U << 2) , COMPLETE_ROWS_F = (1U << 3) , ALL_FLAGS }
	These definitions allow to combine the flags into an appropriate flag set using the normal bitwise operators. More...

Public Types inherited from mysql::binlog::event::Binary_log_event
enum	enum_post_header_length { QUERY_HEADER_MINIMAL_LEN = (4 + 4 + 1 + 2) , QUERY_HEADER_LEN = (QUERY_HEADER_MINIMAL_LEN + 2) , STOP_HEADER_LEN = 0 , START_V3_HEADER_LEN = (2 + ST_SERVER_VER_LEN + 4) , ROTATE_HEADER_LEN = 8 , INTVAR_HEADER_LEN = 0 , APPEND_BLOCK_HEADER_LEN = 4 , DELETE_FILE_HEADER_LEN = 4 , RAND_HEADER_LEN = 0 , USER_VAR_HEADER_LEN = 0 , FORMAT_DESCRIPTION_HEADER_LEN = (START_V3_HEADER_LEN + 1 + LOG_EVENT_TYPES) , XID_HEADER_LEN = 0 , BEGIN_LOAD_QUERY_HEADER_LEN = APPEND_BLOCK_HEADER_LEN , ROWS_HEADER_LEN_V1 = 8 , TABLE_MAP_HEADER_LEN = 8 , EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN = (4 + 4 + 4 + 1) , EXECUTE_LOAD_QUERY_HEADER_LEN , INCIDENT_HEADER_LEN = 2 , HEARTBEAT_HEADER_LEN = 0 , IGNORABLE_HEADER_LEN = 0 , ROWS_HEADER_LEN_V2 = 10 , TRANSACTION_CONTEXT_HEADER_LEN = 18 , VIEW_CHANGE_HEADER_LEN = 52 , XA_PREPARE_HEADER_LEN = 0 , TRANSACTION_PAYLOAD_HEADER_LEN = 0 }
	The lengths for the fixed data part of each event. More...

Public Types inherited from Log_event
enum	enum_skip_reason { EVENT_SKIP_NOT , EVENT_SKIP_IGNORE , EVENT_SKIP_COUNT }
	Enumeration of what kinds of skipping (and non-skipping) that can occur when the slave executes an event. More...

enum	enum_mts_event_exec_mode { EVENT_EXEC_PARALLEL , EVENT_EXEC_ASYNC , EVENT_EXEC_SYNC , EVENT_EXEC_CAN_NOT }

Public Member Functions
	Update_rows_log_event (THD , TABLE , const mysql::binlog::event::Table_id &table_id, MY_BITMAP const cols_bi, MY_BITMAP const cols_ai, bool is_transactional, const unsigned char *extra_row_ndb_info)

	Update_rows_log_event (THD , TABLE , const mysql::binlog::event::Table_id &table_id, bool is_transactional, const unsigned char *extra_row_ndb_info)

void	init (MY_BITMAP const *cols)

	~Update_rows_log_event () override

	Update_rows_log_event (const char buf, const mysql::binlog::event::Format_description_event description_event)

bool	read_write_bitmaps_cmp (const TABLE *table) const override
	Compares the table's read/write_set with the columns included in this event's before-image and/or after-image. More...

void	claim_memory_ownership (bool claim) override
	Allow thread to CLAIM or DISCLAIM the ownership of this object depends on the parameter value passed. More...

Public Member Functions inherited from Rows_log_event
	Rows_log_event (Rows_log_event &&) noexcept=delete

Rows_log_event &	operator= (Rows_log_event &&) noexcept=delete

	Rows_log_event (const Rows_log_event &)=delete

Rows_log_event &	operator= (const Rows_log_event &)=delete

	~Rows_log_event () override

void	set_flags (flag_set flags_arg)

void	clear_flags (flag_set flags_arg)

flag_set	get_flags (flag_set flags_arg) const

int	pack_info (Protocol *protocol) override
	Stores a string representation of this event in the Protocol. More...

int	add_row_data (uchar *data, size_t length)

size_t	get_data_size () override

MY_BITMAP const *	get_cols () const

MY_BITMAP const *	get_cols_ai () const

const mysql::binlog::event::Table_id &	get_table_id () const

bool	write_data_header (Basic_ostream *ostream) override

bool	write_data_body (Basic_ostream *ostream) override

const char *	get_db () override

Public Member Functions inherited from mysql::binlog::event::Rows_event
	Rows_event (Log_event_type type_arg)
	Constructs an event directly. More...

	Rows_event (const char buf, const Format_description_event fde)
	The constructor is responsible for decoding the event contained in the buffer. More...

	~Rows_event () override

unsigned long long	get_table_id () const

enum_flag	get_flags () const

uint32_t	get_null_bits_len () const

unsigned long	get_width () const

std::string	get_enum_flag_string () const
	Gets the flags listed as strings. More...

Public Member Functions inherited from mysql::binlog::event::Binary_log_event
virtual	~Binary_log_event ()=0

	Binary_log_event (const Binary_log_event &)=default

	Binary_log_event (Binary_log_event &&)=default

Binary_log_event &	operator= (const Binary_log_event &)=default

Binary_log_event &	operator= (Binary_log_event &&)=default

enum Log_event_type	get_event_type () const
	Helper method. More...

const Log_event_header *	header () const
	Return a const pointer to the header of the log event. More...

Log_event_header *	header ()
	Return a non-const pointer to the header of the log event. More...

const Log_event_footer *	footer () const
	Return a const pointer to the footer of the log event. More...

Log_event_footer *	footer ()
	Return a non-const pointer to the footer of the log event. More...

Event_reader &	reader ()
	Returns a reference to the event Event_reader object. More...

Public Member Functions inherited from Log_event
	Log_event (mysql::binlog::event::Log_event_header header, mysql::binlog::event::Log_event_footer footer, enum_event_cache_type cache_type_arg, enum_event_logging_type logging_type_arg)
	This minimal constructor is for when you are not even sure that there is a valid THD. More...

	Log_event (THD thd_arg, uint16 flags_arg, enum_event_cache_type cache_type_arg, enum_event_logging_type logging_type_arg, mysql::binlog::event::Log_event_header header, mysql::binlog::event::Log_event_footer *footer)

int	net_send (Protocol protocol, const char log_name, my_off_t pos)
	Only called by SHOW BINLOG EVENTS. More...

void *	operator new (size_t size)

bool	wrapper_my_b_safe_write (Basic_ostream ostream, const uchar buf, size_t data_length)
	Write the given buffer to the given output stream, updating the checksum if checksums are enabled. More...

virtual bool	write (Basic_ostream *ostream)

time_t	get_time ()
	Prints a "session_var=value" string. More...

virtual mysql::binlog::event::Log_event_type	get_type_code () const

virtual bool	is_sbr_logging_format () const
	Return true if the event has to be logged using SBR for DMLs. More...

bool	is_valid ()

void	set_artificial_event ()

void	set_relay_log_event ()

bool	is_artificial_event () const

bool	is_relay_log_event () const

bool	is_ignorable_event () const

bool	is_no_filter_event () const

bool	is_using_trans_cache () const

bool	is_using_stmt_cache () const

bool	is_using_immediate_logging () const

	Log_event (mysql::binlog::event::Log_event_header header, mysql::binlog::event::Log_event_footer footer)

virtual	~Log_event ()

void	register_temp_buf (char *buf, bool free_in_destructor=true)

void	free_temp_buf ()

const char *	get_type_str () const
	Returns the human readable name of this event's type. More...

bool	is_mts_sequential_exec () const
	Is called from get_mts_execution_mode() to. More...

virtual uint8	get_mts_dbs (Mts_db_names arg, Rpl_filter rpl_filter)
	The method fills in pointers to event's database name c-strings to a supplied array. More...

bool	contains_partition_info (bool)

virtual uint8	mts_number_dbs ()

bool	is_mts_group_isolated ()

virtual bool	starts_group () const
	Events of a certain type can start or end a group of events treated transactionally wrt binlog. More...

virtual bool	ends_group () const

int	apply_event (Relay_log_info *rli)
	Apply the event to the database. More...

int	apply_gtid_event (Relay_log_info *rli)
	Apply the GTID event in curr_group_data to the database. More...

int	update_pos (Relay_log_info *rli)
	Update the relay log position. More...

enum_skip_reason	shall_skip (Relay_log_info *rli)
	Decide if the event shall be skipped, and the reason for skipping it. More...

virtual int	do_apply_event_worker (Slave_worker *w)

Public Member Functions inherited from mysql::binlog::event::Update_rows_event
	Update_rows_event (const char buf, const Format_description_event fde)

	Update_rows_event (Log_event_type event_type)

Static Public Member Functions
static bool	binlog_row_logging_function (THD thd, TABLE table, bool is_transactional, const uchar before_record, const uchar after_record)

Static Public Member Functions inherited from mysql::binlog::event::Rows_event
static std::string	get_flag_string (enum_flag flag)
	Gets a string describing the flags. More...

Static Public Member Functions inherited from Log_event
static void	init_show_field_list (mem_root_deque< Item * > *field_list)
	init_show_field_list() prepares the column names and types for the output of SHOW BINLOG EVENTS; it is used only by SHOW BINLOG EVENTS. More...

static void	operator delete (void *ptr, size_t)

static void *	operator new (size_t, void *ptr)

static void	operator delete (void , void )

static const char *	get_type_str (mysql::binlog::event::Log_event_type type)
	Returns the human readable name of the given event type. More...

static const char *	get_type_str (uint type)
	Get the name of an event type, or "Unknown" if out of range. More...

static bool	is_mts_sequential_exec (mysql::binlog::event::Log_event_type type_code)

static enum enum_mts_event_exec_mode	get_mts_execution_mode (bool mts_in_group, mysql::binlog::event::Log_event_type type_code, uint32 server_id, uint32 log_pos)

Protected Member Functions
mysql::binlog::event::Log_event_type	get_general_type_code () override

int	do_before_row_operations (const Relay_log_info *const) override

int	do_after_row_operations (const Relay_log_info *const, int) override

int	do_exec_row (const Relay_log_info *const) override

int	skip_after_image_for_update_event (const Relay_log_info rli, const uchar curr_bi_start) override
	Seek past the after-image of an update event, in case a row was processed without reading the after-image. More...

Protected Member Functions inherited from Rows_log_event
	Rows_log_event (THD , TABLE , const mysql::binlog::event::Table_id &table_id, MY_BITMAP const cols, bool is_transactional, mysql::binlog::event::Log_event_type event_type, const unsigned char extra_row_ndb_info)

	Rows_log_event (const char row_data, const mysql::binlog::event::Format_description_event description_event)

virtual int	do_add_row_data (uchar *data, size_t length)

int	unpack_current_row (const Relay_log_info const rli, MY_BITMAP const cols, bool is_after_image, bool only_seek=false)
	Unpack the current row image from the event into m_table->record[0]. More...

int	update_generated_columns (MY_BITMAP const &fields_to_update)
	Updates the generated columns of the `TABLE` object referenced by `m_table`, that have an active bit in the parameter bitset `fields_to_update`. More...

void	decide_row_lookup_algorithm_and_key ()

int	row_operations_scan_and_key_setup ()

int	row_operations_scan_and_key_teardown (int error)

bool	is_auto_inc_in_extra_columns (const Relay_log_info *const rli)
	Helper function to check whether there is an auto increment column on the table where the event is to be applied. More...

bool	is_rbr_logging_format () const override
	Return true if the event has to be logged using RBR for DMLs. More...

Protected Member Functions inherited from mysql::binlog::event::Binary_log_event
	Binary_log_event (Log_event_type type_code)
	This constructor is used to initialize the type_code of header object m_header. More...

	Binary_log_event (const char *buf, const Format_description_event fde)
	This constructor will create a new object of Log_event_header and initialize the variable m_header, which in turn will be used to initialize Log_event's member common_header. More...

Protected Member Functions inherited from Log_event
uint32	write_header_to_memory (uchar *buf)
	Writes the common header of this event to the given memory buffer. More...

bool	write_header (Basic_ostream *ostream, size_t data_length)
	Writes the common-header of this event to the given output stream and updates the checksum. More...

bool	write_footer (Basic_ostream *ostream)

bool	need_checksum ()
	A decider of whether to trigger checksum computation or not. More...

enum_skip_reason	continue_group (Relay_log_info *rli)
	Helper function to ignore an event w.r.t. More...

Static Private Member Functions
static mysql::binlog::event::Log_event_type	get_update_rows_event_type (const THD *thd_arg)
	Auxiliary function used in the (THD*, ...) constructor to determine the type code based on configuration options. More...

Additional Inherited Members
Public Attributes inherited from Rows_log_event
uint	m_row_count

Public Attributes inherited from mysql::binlog::event::Rows_event
Extra_row_info	m_extra_row_info

Public Attributes inherited from Log_event
char *	temp_buf

bool	m_free_temp_buf_in_destructor

ulong	exec_time

uint32	server_id

ulong	rbr_exec_mode
	A storage to cache the global system variable's value. More...

enum_event_cache_type	event_cache_type
	Defines the type of the cache, if any, where the event will be stored before being flushed to disk. More...

enum_event_logging_type	event_logging_type
	Defines when information, i.e. More...

ha_checksum	crc
	Placeholder for event checksum while writing to binlog. More...

ulong	mts_group_idx
	Index in `rli->gaq` array to indicate a group that this event is purging. More...

mysql::binlog::event::Log_event_header *	common_header
	The Log_event_header class contains the variable present in the common header. More...

mysql::binlog::event::Log_event_footer *	common_footer
	The Log_event_footer class contains the variable present in the common footer. More...

Relay_log_info *	worker
	MTS: associating the event with either an assigned Worker or Coordinator. More...

ulonglong	future_event_relay_log_pos
	A copy of the main rli value stored into event to pass to MTS worker rli. More...

THD *	thd

db_worker_hash_entry *	mts_assigned_partitions [MAX_DBS_IN_EVENT_MTS]
	Partition info associate with event to deliver to MTS event applier. More...

Static Public Attributes inherited from mysql::binlog::event::Binary_log_event
static const int	LOG_EVENT_TYPES = (ENUM_END_EVENT - 1)

Protected Types inherited from Log_event
enum	enum_event_cache_type { EVENT_INVALID_CACHE = 0 , EVENT_STMT_CACHE , EVENT_TRANSACTIONAL_CACHE , EVENT_NO_CACHE , EVENT_CACHE_COUNT }

enum	enum_event_logging_type { EVENT_INVALID_LOGGING = 0 , EVENT_NORMAL_LOGGING , EVENT_IMMEDIATE_LOGGING , EVENT_CACHE_LOGGING_COUNT }

Static Protected Member Functions inherited from Rows_log_event
static bool	is_trx_retryable_upon_engine_error (int error)
	Helper function to check whether the storage engine error allows for the transaction to be retried or not. More...

Protected Attributes inherited from Rows_log_event
Rows_applier_psi_stage	m_psi_progress

TABLE *	m_table

MY_BITMAP	m_cols

MY_BITMAP	m_local_cols
	Bitmap denoting columns available in the image as they appear in the table setup. More...

Hash_slave_rows	m_hash
	Hash table that will hold the entries for while using HASH_SCAN algorithm to search and update/delete rows. More...

uint	m_rows_lookup_algorithm
	The algorithm to use while searching for rows using the before image. More...

MY_BITMAP	m_cols_ai
	Bitmap for columns available in the after image, if present. More...

MY_BITMAP	m_local_cols_ai
	Bitmap denoting columns available in the after-image as they appear in the table setup. More...

uint32	m_bitbuf [128/(sizeof(uint32) *8)]

uint32	m_bitbuf_ai [128/(sizeof(uint32) *8)]

uchar *	m_rows_buf

uchar *	m_rows_cur

uchar *	m_rows_end

const uchar *	m_curr_row

const uchar *	m_curr_row_end

uchar *	m_key

uint	m_key_index

KEY *	m_key_info

std::set< uchar *, Key_compare >	m_distinct_keys

std::set< uchar *, Key_compare >::iterator	m_itr

uchar *	m_distinct_key_spare_buf
	A spare buffer which will be used when saving the distinct keys for doing an index scan with HASH_SCAN search algorithm. More...

Protected Attributes inherited from mysql::binlog::event::Rows_event
Log_event_type	m_type

Table_id	m_table_id
	Actual event type. More...

uint16_t	m_flags

unsigned long	m_width
	Flags for row-level events. More...

uint32_t	n_bits_len
	The width of the columns bitmap. More...

uint16_t	var_header_len
	value determined by (m_width + 7) / 8 More...

std::vector< uint8_t >	columns_before_image

std::vector< uint8_t >	columns_after_image

std::vector< uint8_t >	row

Detailed Description

Log row updates with a before image.

The event contain several update rows for a table. Note that each event contains only rows for one table.

Also note that the row data consists of pairs of row data: one row for the old data and one row for the new data.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
TYPE_CODE

Constructor & Destructor Documentation

◆ Update_rows_log_event() [1/3]

Update_rows_log_event::Update_rows_log_event	(	THD *	,
		TABLE *	,
		const mysql::binlog::event::Table_id &	table_id,
		MY_BITMAP const *	cols_bi,
		MY_BITMAP const *	cols_ai,
		bool	is_transactional,
		const unsigned char *	extra_row_ndb_info
	)

◆ Update_rows_log_event() [2/3]

Update_rows_log_event::Update_rows_log_event	(	THD *	thd_arg,
		TABLE *	tbl_arg,
		const mysql::binlog::event::Table_id &	table_id,
		bool	is_transactional,
		const unsigned char *	extra_row_ndb_info
	)

◆ ~Update_rows_log_event()

Update_rows_log_event::~Update_rows_log_event ( )

override

◆ Update_rows_log_event() [3/3]

Update_rows_log_event::Update_rows_log_event	(	const char *	buf,
		const mysql::binlog::event::Format_description_event *	description_event
	)

Member Function Documentation

◆ binlog_row_logging_function()

bool Update_rows_log_event::binlog_row_logging_function	(	THD *	thd,
		TABLE *	table,
		bool	is_transactional,
		const uchar *	before_record,
		const uchar *	after_record
	)

static

◆ claim_memory_ownership()

void Update_rows_log_event::claim_memory_ownership ( bool claim )

overridevirtual

Allow thread to CLAIM or DISCLAIM the ownership of this object depends on the parameter value passed.

Parameters

claim True - claim ownership of the memory False - disclaim ownership of the memory

Reimplemented from Log_event.

◆ do_after_row_operations()

int Update_rows_log_event::do_after_row_operations	(	const Relay_log_info * const	,
		int	error
	)

overrideprotectedvirtual

Implements Rows_log_event.

◆ do_before_row_operations()

int Update_rows_log_event::do_before_row_operations ( const Relay_log_info * const )

overrideprotectedvirtual

Implements Rows_log_event.

◆ do_exec_row()

int Update_rows_log_event::do_exec_row ( const Relay_log_info * const rli )

overrideprotectedvirtual

Implements Rows_log_event.

◆ get_general_type_code()

mysql::binlog::event::Log_event_type Update_rows_log_event::get_general_type_code ( )

inlineoverrideprotectedvirtual

Implements Rows_log_event.

◆ get_update_rows_event_type()

mysql::binlog::event::Log_event_type Update_rows_log_event::get_update_rows_event_type ( const THD * thd_arg )

staticprivate

Auxiliary function used in the (THD*, ...) constructor to determine the type code based on configuration options.

Parameters

thd_arg The THD object for the session.

Returns: One of PARTIAL_UPDATE_ROWS_EVENT, or UPDATE_ROWS_EVENT.

◆ init()

void Update_rows_log_event::init ( MY_BITMAP const * cols )

◆ read_write_bitmaps_cmp()

bool Update_rows_log_event::read_write_bitmaps_cmp ( const TABLE * table ) const

inlineoverridevirtual

Compares the table's read/write_set with the columns included in this event's before-image and/or after-image.

Each subclass (Write/Update/Delete) implements this function by comparing on the image(s) pertinent to the subclass.

Parameters

[in] table The table to compare this events bitmaps against.

Return values

true	if sets match
false	otherwise (following bitmap_cmp return logic).

Implements Rows_log_event.

◆ skip_after_image_for_update_event()

int Update_rows_log_event::skip_after_image_for_update_event	(	const Relay_log_info *	rli,
		const uchar *	curr_bi_start
	)

overrideprotectedvirtual

Seek past the after-image of an update event, in case a row was processed without reading the after-image.

An update event may process a row without reading the after-image, e.g. in case of ignored or idempotent errors. To ensure that the read position for the next row is correct, we need to seek past the after-image.

Parameters

rli	The applier context
curr_bi_start	The read position of the beginning of the before-image. (The function compares this with m_curr_row to know if the after-image has been read or not.)

Return values

0	Success
ER_*	Error code returned by unpack_current_row

Reimplemented from Rows_log_event.

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

sql/log_event.h
sql/log_event.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Static Private Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ Update_rows_log_event() [1/3]

◆ Update_rows_log_event() [2/3]

◆ ~Update_rows_log_event()

◆ Update_rows_log_event() [3/3]

Member Function Documentation

◆ binlog_row_logging_function()

◆ claim_memory_ownership()

◆ do_after_row_operations()

◆ do_before_row_operations()

◆ do_exec_row()

◆ get_general_type_code()

◆ get_update_rows_event_type()

◆ init()

◆ read_write_bitmaps_cmp()

◆ skip_after_image_for_update_event()