Binary Log

Namespaces
namespace	anonymous_namespace{binlog.cc}

Classes
class	MYSQL_BIN_LOG::Binlog_ofile
	Logical binlog file which wraps and hides the detail of lower layer storage implementation. More...
class	Thd_backup_and_restore
	Helper class to switch to a new thread and then go back to the previous one, when the object is destroyed using RAII. More...
class	binlog_cache_data
	Caches for non-transactional and transactional data before writing it to the binary log. More...
class	binlog_stmt_cache_data
class	binlog_trx_cache_data
class	binlog_cache_mngr
class	Binlog_event_writer
	Auxiliary class to copy serialized events to the binary log and correct some of the fields that are not known until just before writing the event. More...
class	Binlog_cache_compressor
	Controls the execution flow when we compress the transaction cache into memory and write back the compressed data to the transaction cache. More...

Macros
#define	MY_OFF_T_UNDEF   (~(my_off_t)0UL)
#define	LIMIT_UNSAFE_WARNING_ACTIVATION_TIMEOUT   50
#define	LIMIT_UNSAFE_WARNING_ACTIVATION_THRESHOLD_COUNT   50

Enumerations
enum	enum_read_gtids_from_binlog_status {   GOT_GTIDS , GOT_PREVIOUS_GTIDS , NO_GTIDS , ERROR ,   TRUNCATED }

Functions
static int	binlog_init (void *p)
static int	binlog_start_trans_and_stmt (THD *thd, Log_event *start_event)
	Function to start a statement and optionally a transaction for the binary log. More...
static int	binlog_close_connection (handlerton *hton, THD *thd)
static int	binlog_savepoint_set (handlerton *hton, THD *thd, void *sv)
static int	binlog_savepoint_rollback (handlerton *hton, THD *thd, void *sv)
static bool	binlog_savepoint_rollback_can_release_mdl (handlerton *, THD *thd)
	Check whether binlog state allows to safely release MDL locks after rollback to savepoint. More...
static int	binlog_commit (handlerton *, THD *, bool)
	This function is called once after each statement. More...
static int	binlog_rollback (handlerton *, THD *thd, bool all)
	This function is called when a transaction or a statement is rolled back. More...
static int	binlog_prepare (handlerton *hton, THD *thd, bool all)
static int	binlog_set_prepared_in_tc (handlerton *hton, THD *thd)
static void	exec_binlog_error_action_abort (const char *err_string)
	When a fatal error occurs due to which binary logging becomes impossible and the user specified binlog_error_action= ABORT_SERVER the following function is invoked. More...
static void	binlog_prepare_row_images (const THD *thd, TABLE *table)
static bool	is_loggable_xa_prepare (THD *thd)
	Predicate function yields true when XA transaction is being logged having a proper state ready for prepare or commit in one phase. More...
bool	normalize_binlog_name (char *to, const char *from, bool is_relay_log)
	Turns a relative log binary log path into a full path, based on the opt_bin_logname or opt_relay_logname. More...
static std::pair< bool, int >	check_purge_conditions (const MYSQL_BIN_LOG &log)
	Checks whether purge conditions are met to be able to run purge for binary log files. More...
static time_t	calculate_auto_purge_lower_time_bound ()
	This function abstracts the calculation of the binary log files retention lower bound. More...
static bool	check_auto_purge_conditions ()
	Checks if automatic purge conditions are met and therefore the purge is allowed to be done. More...
static binlog_cache_mngr *	thd_get_cache_mngr (const THD *thd)
void	check_binlog_cache_size (THD *thd)
	Checks if the BINLOG_CACHE_SIZE's value is greater than MAX_BINLOG_CACHE_SIZE. More...
void	check_binlog_stmt_cache_size (THD *thd)
	Checks if the BINLOG_STMT_CACHE_SIZE's value is greater than MAX_BINLOG_STMT_CACHE_SIZE. More...
bool	binlog_enabled ()
	Check whether binlog_hton has valid slot and enabled. More...
static void	binlog_trans_log_savepos (THD *thd, my_off_t *pos)
static int	binlog_dummy_recover (handlerton *, XA_recover_txn *, uint, MEM_ROOT *)
static int	binlog_deinit (void *)
enum xa_option_words	get_xa_opt (THD *thd)
static uint	purge_log_get_error_code (int res)
	purge logs, master and slave sides both, related error code converter. More...
static bool	purge_error_message (THD *thd, int res)
bool	is_transaction_empty (THD *thd)
	Check if the the transaction is empty. More...
int	check_trx_rw_engines (THD *thd, Transaction_ctx::enum_trx_scope trx_scope)
	Check if the transaction has no rw flag set for any of the storage engines. More...
bool	is_empty_transaction_in_binlog_cache (const THD *thd)
	Check if at least one of transacaction and statement binlog caches contains an empty transaction, other one is empty or contains an empty transaction, which has two binlog events "BEGIN" and "COMMIT". More...
bool	trans_has_updated_trans_table (const THD *thd)
	This function checks if a transactional table was updated by the current transaction. More...
bool	stmt_has_updated_trans_table (Ha_trx_info_list const &ha_list)
	This function checks if a transactional table was updated by the current statement. More...
bool	ending_trans (THD *thd, const bool all)
	This function checks if a transaction, either a multi-statement or a single statement transaction is about to commit or not. More...
bool	ending_single_stmt_trans (THD *thd, const bool all)
	This function checks if a single statement transaction is about to commit or not. More...
bool	trans_cannot_safely_rollback (const THD *thd)
	This function checks if a transaction cannot be rolled back safely. More...
bool	stmt_cannot_safely_rollback (const THD *thd)
	This function checks if current statement cannot be rollded back safely. More...
bool	purge_source_logs_to_file (THD *thd, const char *to_log)
	Execute a PURGE BINARY LOGS TO <log> command. More...
bool	purge_source_logs_before_date (THD *thd, time_t purge_time)
	Execute a PURGE BINARY LOGS BEFORE <date> command. More...
int	query_error_code (const THD *thd, bool not_killed)
static bool	copy_file (IO_CACHE *from, IO_CACHE *to, my_off_t offset)
	Copy content of 'from' file from offset to 'to' file. More...
int	log_loaded_block (IO_CACHE *file)
	Load data's io cache specific hook to be executed before a chunk of data is being read into the cache's buffer The function instantiates and writes into the binlog replication events along LOAD DATA processing. More...
template<class BINLOG_FILE_READER >
bool	show_binlog_events (THD *thd, MYSQL_BIN_LOG *binary_log)
bool	mysql_show_binlog_events (THD *thd)
	Execute a SHOW BINLOG EVENTS statement. More...
static bool	is_number (const char *str, ulong *res, bool allow_wildcards)
	Check if a string is a valid number. More...
static int	find_uniq_filename (char *name, uint32 new_index_number)
	Find a unique filename for 'filename. More...
static bool	read_gtids_and_update_trx_parser_from_relaylog (const char *filename, Gtid_set *retrieved_gtids, bool verify_checksum, Transaction_boundary_parser *trx_parser, Gtid_monitoring_info *partial_trx)
	Add the GTIDs from the given relaylog file and also update the IO thread transaction parser. More...
static enum_read_gtids_from_binlog_status	read_gtids_from_binlog (const char *filename, Gtid_set *all_gtids, Gtid_set *prev_gtids, Gtid *first_gtid, Sid_map *sid_map, bool verify_checksum, bool is_relay_log)
	Reads GTIDs from the given binlog file. More...
static int	compare_log_name (const char *log_1, const char *log_2)
static int	call_after_sync_hook (THD *queue_head)
	Auxiliary function used in ordered_commit. More...
static void	register_binlog_handler (THD *thd, bool trx)
static bool	has_write_table_with_auto_increment (Table_ref *tables)
static bool	has_write_table_with_auto_increment_and_query_block (Table_ref *tables)
static bool	has_write_table_auto_increment_not_first_in_pk (Table_ref *tables)
static bool	has_nondeterministic_default (const TABLE *table)
	Checks if a table has a column with a non-deterministic DEFAULT expression. More...
static bool	has_write_table_with_nondeterministic_default (const Table_ref *tables)
	Checks if a Table_ref contains a table that has been opened for writing, and that has a column with a non-deterministic DEFAULT expression. More...
static bool	has_acl_table_read (THD *thd, const Table_ref *tl_list)
	Checks if we have reads from ACL tables in table list. More...
static bool	fulltext_unsafe_set (TABLE_SHARE *s)
const char *	get_locked_tables_mode_name (enum_locked_tables_mode locked_tables_mode)
	Getter for the enum enum_locked_tables_mode. More...
static bool	handle_gtid_consistency_violation (THD *thd, int error_code, int log_error_code)
	Given that a possible violation of gtid consistency has happened, checks if gtid-inconsistencies are forbidden by the current value of ENFORCE_GTID_CONSISTENCY and GTID_MODE. More...
static const char *	show_query_type (THD::enum_binlog_query_type qtype)
static void	reset_binlog_unsafe_suppression ()
	Auxiliary function to reset the limit unsafety warning suppression. More...
static void	print_unsafe_warning_to_log (int unsafe_type, char *buf, const char *query)
	Auxiliary function to print warning in the error log. More...
static void	do_unsafe_limit_checkout (char *buf, int unsafe_type, const char *query)
	Auxiliary function to check if the warning for limit unsafety should be thrown or suppressed. More...
int	binlog_stmt_cache_data::finalize (THD *thd)
int	binlog_cache_data::write_event (Log_event *event)
void	binlog_cache_data::set_incident (std::string_view incident_message="Non-transactional changes were not written to the binlog.")
bool	binlog_cache_data::has_incident (void) const
bool	MYSQL_BIN_LOG::assign_automatic_gtids_to_flush_group (THD *first_seen)
	Assign automatic generated GTIDs for all commit group threads in the flush stage having gtid_next.type == AUTOMATIC_GTID. More...
bool	MYSQL_BIN_LOG::write_transaction (THD *thd, binlog_cache_data *cache_data, Binlog_event_writer *writer, bool parallelization_barrier)
	Write the Gtid_log_event to the binary log (prior to writing the statement or transaction cache). More...
int	MYSQL_BIN_LOG::gtid_end_transaction (THD *thd)
	If the thread owns a GTID, this function generates an empty transaction and releases ownership of the GTID. More...
bool	MYSQL_BIN_LOG::reencrypt_logs ()
	Re-encrypt previous existent binary/relay logs as below. More...
bool	binlog_cache_data::compress (THD *thd)
	Compress the current transaction "in-place", if possible. More...
int	binlog_cache_data::finalize (THD *thd, Log_event *end_event)
	This function finalizes the cache preparing for commit or rollback. More...
int	binlog_cache_data::finalize (THD *thd, Log_event *end_event, XID_STATE *xs)
	The method writes XA END query to XA-prepared transaction's cache and calls the "basic" finalize(). More...
int	binlog_cache_mngr::handle_deferred_cache_write_incident (THD *thd)
	Handle previous failure writing cache, aka. More...
int	binlog_cache_data::flush (THD *thd, my_off_t *bytes, bool *wrote_xid, bool parallelization_barrier)
	Flush caches to the binary log. More...
void	binlog_trx_cache_data::truncate (THD *thd, bool all)
	This function truncates the transactional cache upon committing or rolling back either a transaction or a statement. More...
int	MYSQL_BIN_LOG::write_xa_to_cache (THD *thd)
	Logging XA commit/rollback of a prepared transaction. More...
bool	MYSQL_BIN_LOG::write_incident_commit (THD *thd, std::string_view incident_message)
	Write an incident and call commit. More...
int	MYSQL_BIN_LOG::rollback (THD *thd, bool all) override
	Write a rollback record of the transaction to the binary log. More...
bool	MYSQL_BIN_LOG::is_current_stmt_binlog_enabled_and_caches_empty (const THD *thd) const
	Checks whether binlog caches are disabled (binlog does not cache data) or empty in case binloggging is enabled in the current call to this function. More...
	MYSQL_BIN_LOG::MYSQL_BIN_LOG (uint *sync_period, bool relay_log=false)
	MYSQL_BIN_LOG::~MYSQL_BIN_LOG () override
void	MYSQL_BIN_LOG::cleanup ()
void	MYSQL_BIN_LOG::init_pthread_objects ()
int	MYSQL_BIN_LOG::generate_new_name (char *new_name, const char *log_name, uint32 new_index_number=0)
const char *	MYSQL_BIN_LOG::generate_name (const char *log_name, const char *suffix, char *buff)
bool	MYSQL_BIN_LOG::init_and_set_log_file_name (const char *log_name, const char *new_name, uint32 new_index_number)
bool	MYSQL_BIN_LOG::open (PSI_file_key log_file_key, const char *log_name, const char *new_name, uint32 new_index_number)
	Open the logfile and init IO_CACHE. More...
bool	MYSQL_BIN_LOG::open_index_file (const char *index_file_name_arg, const char *log_name, bool need_lock_index)
bool	MYSQL_BIN_LOG::find_first_log (std::string &binlog_file_name, std::string &errmsg)
	Find the oldest binary log referenced by the index file. More...
bool	MYSQL_BIN_LOG::find_first_log_not_in_gtid_set (char *binlog_file_name, const Gtid_set *gtid_set, Gtid *first_gtid, std::string &errmsg)
	Find the oldest binary log that contains any GTID that is not in the given gtid set. More...
bool	MYSQL_BIN_LOG::init_gtid_sets (Gtid_set *gtid_set, Gtid_set *lost_groups, bool verify_checksum, bool need_lock, Transaction_boundary_parser *trx_parser, Gtid_monitoring_info *partial_trx, bool is_server_starting=false)
	Reads the set of all GTIDs in the binary/relay log, and the set of all lost GTIDs in the binary log, and stores each set in respective argument. More...
bool	MYSQL_BIN_LOG::open_binlog (const char *log_name, const char *new_name, ulong max_size_arg, bool null_created_arg, bool need_lock_index, bool need_sid_lock, Format_description_log_event *extra_description_event, uint32 new_index_number=0)
	Create a new binary log. More...
int	MYSQL_BIN_LOG::move_crash_safe_index_file_to_index_file (bool need_lock_index)
	Move crash safe index file to index file. More...
int	MYSQL_BIN_LOG::add_log_to_index (uchar *log_file_name, size_t name_len, bool need_lock_index)
	Append log file name to index file. More...
int	MYSQL_BIN_LOG::get_current_log (LOG_INFO *linfo, bool need_lock_log=true)
int	MYSQL_BIN_LOG::raw_get_current_log (LOG_INFO *linfo)
bool	MYSQL_BIN_LOG::check_write_error (const THD *thd)
void	MYSQL_BIN_LOG::report_cache_write_error (THD *thd, bool is_transactional)
int	MYSQL_BIN_LOG::find_log_pos (LOG_INFO *linfo, const char *log_name, bool need_lock_index)
	Find the position in the log-index-file for the given log name. More...
int	MYSQL_BIN_LOG::find_next_log (LOG_INFO *linfo, bool need_lock_index)
	Find the position in the log-index-file for the given log name. More...
int	MYSQL_BIN_LOG::find_next_relay_log (char log_name[FN_REFLEN+1])
	Find the relay log name following the given name from relay log index file. More...
std::pair< int, std::list< std::string > >	MYSQL_BIN_LOG::get_log_index (bool need_lock_index=true)
	Retrieves the contents of the index file associated with this log object into an std::list<std::string> object. More...
bool	MYSQL_BIN_LOG::reset_logs (THD *thd, bool delete_only=false)
	Removes files, as part of a RESET MASTER or RESET SLAVE statement, by deleting all logs referred to in the index file and the index file. More...
int	MYSQL_BIN_LOG::set_crash_safe_index_file_name (const char *base_file_name)
	Set the name of crash safe index file. More...
int	MYSQL_BIN_LOG::open_crash_safe_index_file ()
	Open a (new) crash safe index file. More...
int	MYSQL_BIN_LOG::close_crash_safe_index_file ()
	Close the crash safe index file. More...
int	MYSQL_BIN_LOG::remove_logs_from_index (LOG_INFO *linfo, bool need_update_threads)
	Remove logs from index file. More...
int	MYSQL_BIN_LOG::purge_logs (const char *to_log, bool included, bool need_lock_index, bool need_update_threads, ulonglong *decrease_log_space, bool auto_purge)
	Remove all logs before the given log from disk and from the index file. More...
int	MYSQL_BIN_LOG::set_purge_index_file_name (const char *base_file_name)
int	MYSQL_BIN_LOG::open_purge_index_file (bool destroy)
int	MYSQL_BIN_LOG::close_purge_index_file ()
bool	MYSQL_BIN_LOG::is_inited_purge_index_file ()
int	MYSQL_BIN_LOG::sync_purge_index_file ()
int	MYSQL_BIN_LOG::register_purge_index_entry (const char *entry)
int	MYSQL_BIN_LOG::register_create_index_entry (const char *entry)
int	MYSQL_BIN_LOG::purge_index_entry (THD *thd, ulonglong *decrease_log_space, bool need_lock_index)
int	MYSQL_BIN_LOG::purge_logs_before_date (time_t purge_time, bool auto_purge)
	Remove all logs before the given file date from disk and from the index file. More...
void	MYSQL_BIN_LOG::make_log_name (char *buf, const char *log_ident)
	Create a new log file name. More...
bool	MYSQL_BIN_LOG::is_active (const char *log_file_name) const
	Check if we are writing/reading to the given log file. More...
void	MYSQL_BIN_LOG::inc_prep_xids (THD *thd)
	Increment the prepared XID counter. More...
void	MYSQL_BIN_LOG::dec_prep_xids (THD *thd)
	Decrement the prepared XID counter. More...
int	MYSQL_BIN_LOG::new_file (Format_description_log_event *extra_description_event)
int	MYSQL_BIN_LOG::new_file_without_locking (Format_description_log_event *extra_description_event)
int	MYSQL_BIN_LOG::new_file_impl (bool need_lock, Format_description_log_event *extra_description_event)
	Start writing to a new log file or reopen the old file. More...
bool	MYSQL_BIN_LOG::after_write_to_relay_log (Master_info *mi)
	Called after an event has been written to the relay log by the IO thread. More...
bool	MYSQL_BIN_LOG::truncate_update_log_file (const char *log_name, my_off_t valid_pos, my_off_t binlog_size, bool update)
	Truncte log file and clear LOG_EVENT_BINLOG_IN_USE_F when update is set. More...
bool	MYSQL_BIN_LOG::write_event (Log_event *ev, Master_info *mi)
bool	MYSQL_BIN_LOG::write_buffer (const char *buf, uint len, Master_info *mi)
bool	MYSQL_BIN_LOG::flush ()
bool	MYSQL_BIN_LOG::flush_and_sync (const bool force=false)
	Flush binlog cache and synchronize to disk. More...
void	MYSQL_BIN_LOG::start_union_events (THD *thd, query_id_t query_id_param)
void	MYSQL_BIN_LOG::stop_union_events (THD *thd)
bool	MYSQL_BIN_LOG::is_query_in_union (THD *thd, query_id_t query_id_param)
void	MYSQL_BIN_LOG::update_thd_next_event_pos (THD *thd)
int	MYSQL_BIN_LOG::flush_and_set_pending_rows_event (THD *thd, Rows_log_event *event, bool is_transactional)
bool	MYSQL_BIN_LOG::write_event (Log_event *event_info)
	Write an event to the binary log cache. More...
int	MYSQL_BIN_LOG::rotate (bool force_rotate, bool *check_purge)
	The method executes rotation when LOCK_log is already acquired by the caller. More...
void	MYSQL_BIN_LOG::auto_purge_at_server_startup ()
	This member function is to be called at server startup. More...
void	MYSQL_BIN_LOG::auto_purge ()
	This function runs automatic purge if the conditions to meet automatic purge are met. More...
int	MYSQL_BIN_LOG::rotate_and_purge (THD *thd, bool force_rotate)
	Execute a FLUSH LOGS statement. More...
uint	MYSQL_BIN_LOG::next_file_id ()
int	MYSQL_BIN_LOG::get_gtid_executed (Sid_map *sid_map, Gtid_set *gtid_set)
	Deep copy global_sid_map and gtid_executed. More...
void	MYSQL_BIN_LOG::register_log_info (LOG_INFO *log_info)
	Register LOG_INFO so that log_in_use and adjust_linfo_offsets can operate on all logs. More...
void	MYSQL_BIN_LOG::unregister_log_info (LOG_INFO *log_info)
	Unregister LOG_INFO when it is no longer needed. More...
int	MYSQL_BIN_LOG::log_in_use (const char *log_name)
	Check if any threads use log name. More...
void	MYSQL_BIN_LOG::adjust_linfo_offsets (my_off_t purge_offset)
	Adjust the position pointer in the binary log file for all running replicas. More...
bool	MYSQL_BIN_LOG::do_write_cache (Binlog_cache_storage *cache, class Binlog_event_writer *writer)
	Write the contents of the given IO_CACHE to the binary log. More...
bool	MYSQL_BIN_LOG::write_stmt_directly (THD *thd, const char *stmt, size_t stmt_len, enum enum_sql_command sql_command)
	Write a dml into statement cache and then flush it into binlog. More...
bool	MYSQL_BIN_LOG::write_event_to_binlog (Log_event *ev)
bool	MYSQL_BIN_LOG::write_event_to_binlog_and_sync (Log_event *ev)
bool	MYSQL_BIN_LOG::write_cache (THD *thd, class binlog_cache_data *cache_data, class Binlog_event_writer *writer)
	Write the contents of the statement or transaction cache to the binary log. More...
void	MYSQL_BIN_LOG::report_binlog_write_error ()
int	MYSQL_BIN_LOG::wait_for_update ()
	Wait until we get a signal that the binary log has been updated. More...
int	MYSQL_BIN_LOG::wait_for_update (const std::chrono::nanoseconds &timeout)
	Wait until we get a signal that the binary log has been updated. More...
void	MYSQL_BIN_LOG::close (uint exiting, bool need_lock_log, bool need_lock_index)
	Close the log file. More...
void	MYSQL_BIN_LOG::harvest_bytes_written (Relay_log_info *rli, bool need_log_space_lock)
	Adds bytes written in the current relay log into the variable handling the total number of bytes acquired by the replica. More...
void	MYSQL_BIN_LOG::set_max_size (ulong max_size_arg)
bool	MYSQL_BIN_LOG::read_binlog_in_use_flag (Binlog_file_reader &binlog_file_reader)
	Read binary log stream header and Format_desc event from binlog_file_reader. More...
int	MYSQL_BIN_LOG::open_binlog (const char *opt_name)
bool	MYSQL_BIN_LOG::truncate_relaylog_file (Master_info *mi, my_off_t valid_pos)
	Truncate the active relay log file in the specified position. More...
void	MYSQL_BIN_LOG::close () override
	This is called on shutdown, after ha_panic. More...
int	MYSQL_BIN_LOG::prepare (THD *thd, bool all) override
	Log a prepare record of the transaction to the storage engines. More...
enum_result	MYSQL_BIN_LOG::commit (THD *thd, bool all) override
	Commit the transaction in the transaction coordinator. More...
std::pair< int, my_off_t >	MYSQL_BIN_LOG::flush_thread_caches (THD *thd)
	Flush caches for session. More...
void	MYSQL_BIN_LOG::init_thd_variables (THD *thd, bool all, bool skip_commit)
	Set thread variables used while flushing a transaction. More...
THD *	MYSQL_BIN_LOG::fetch_and_process_flush_stage_queue (const bool check_and_skip_flush_logs=false)
	Fetch and empty BINLOG_FLUSH_STAGE and COMMIT_ORDER_FLUSH_STAGE flush queues and flush transactions to the disk, and unblock threads executing slave preserve commit order. More...
int	MYSQL_BIN_LOG::process_flush_stage_queue (my_off_t *total_bytes_var, THD **out_queue_var)
	Execute the flush stage. More...
void	MYSQL_BIN_LOG::process_commit_stage_queue (THD *thd, THD *queue)
	Commit a sequence of sessions. More...
void	MYSQL_BIN_LOG::process_after_commit_stage_queue (THD *thd, THD *first)
	Process after commit for a sequence of sessions. More...
bool	MYSQL_BIN_LOG::change_stage (THD *thd, Commit_stage_manager::StageID stage, THD *queue, mysql_mutex_t *leave_mutex, mysql_mutex_t *enter_mutex)
	Enter a stage of the ordered commit procedure. More...
int	MYSQL_BIN_LOG::flush_cache_to_file (my_off_t *flush_end_pos)
	Flush the I/O cache to file. More...
std::pair< bool, bool >	MYSQL_BIN_LOG::sync_binlog_file (bool force)
	Call fsync() to sync the file to disk. More...
int	MYSQL_BIN_LOG::finish_commit (THD *thd)
	Helper function executed when leaving ordered_commit. More...
void	MYSQL_BIN_LOG::handle_binlog_flush_or_sync_error (THD *thd, bool need_lock_log, const char *message)
	Helper function to handle flush or sync stage errors. More...
int	MYSQL_BIN_LOG::ordered_commit (THD *thd, bool all, bool skip_commit=false)
	Flush and commit the transaction. More...
void	MYSQL_BIN_LOG::report_missing_purged_gtids (const Gtid_set *slave_executed_gtid_set, std::string &errmsg)
	Function to report the missing GTIDs. More...
void	MYSQL_BIN_LOG::report_missing_gtids (const Gtid_set *previous_gtid_set, const Gtid_set *slave_executed_gtid_set, std::string &errmsg)
	Function to report the missing GTIDs. More...
void	MYSQL_BIN_LOG::signal_update ()
	Notifies waiting threads that binary log has been updated. More...
void	MYSQL_BIN_LOG::update_binlog_end_pos (bool need_lock=true)
void	MYSQL_BIN_LOG::update_binlog_end_pos (const char *file, my_off_t pos)
bool	THD::is_binlog_cache_empty (bool is_transactional) const
	Return true if the statement/transaction cache is currently empty, false otherwise. More...
int	THD::binlog_setup_trx_data ()
int	THD::binlog_write_table_map (TABLE *table, bool is_transactional, bool binlog_rows_query)
	This function writes a table map to the binary log. More...
Rows_log_event *	THD::binlog_get_pending_rows_event (bool is_transactional) const
	This function retrieves a pending row event from a cache which is specified through the parameter is_transactional. More...
void	THD::add_to_binlog_accessed_dbs (const char *db)
int	THD::decide_logging_format (Table_ref *tables)
	Decide on logging format to use for the statement and issue errors or warnings as needed. More...
bool	THD::is_ddl_gtid_compatible ()
bool	THD::is_dml_gtid_compatible (bool some_transactional_table, bool some_non_transactional_table, bool non_transactional_tables_are_tmp)
	is_dml_gtid_compatible() and is_ddl_gtid_compatible() check if the statement that is about to be processed will safely get a GTID. More...
template<class RowsEventT >
Rows_log_event *	THD::binlog_prepare_pending_rows_event (TABLE *table, uint32 serv_id, size_t needed, bool is_transactional, const unsigned char *extra_row_info, uint32 source_part_id=INT_MAX)
int	THD::binlog_write_row (TABLE *table, bool is_transactional, const uchar *new_data, const unsigned char *extra_row_info)
int	THD::binlog_update_row (TABLE *table, bool is_transactional, const uchar *old_data, const uchar *new_data, const uchar *extra_row_info)
int	THD::binlog_delete_row (TABLE *table, bool is_transactional, const uchar *old_data, const unsigned char *extra_row_info)
int	THD::binlog_flush_pending_rows_event (bool stmt_end, bool is_transactional)
void	THD::issue_unsafe_warnings ()
	Auxiliary method used by binlog_query() to raise warnings. More...
int	THD::binlog_query (enum_binlog_query_type qtype, const char *query, size_t query_len, bool is_trans, bool direct, bool suppress_use, int errcode)
	Log the current query. More...

Variables
static ulonglong	limit_unsafe_suppression_start_time = 0
static bool	unsafe_warning_suppression_is_activated = false
static int	limit_unsafe_warning_count = 0
static handlerton *	binlog_hton
bool	opt_binlog_order_commits = true
const char *	log_bin_index = nullptr
const char *	log_bin_basename = nullptr
ulong	rpl_read_size
MYSQL_BIN_LOG mysql_bin_log &	sync_binlog_period
static const char *	g_stage_name []
	Names for the stages. More...
struct st_mysql_storage_engine	binlog_storage_engine

Detailed Description

Macro Definition Documentation

LIMIT_UNSAFE_WARNING_ACTIVATION_THRESHOLD_COUNT

#define LIMIT_UNSAFE_WARNING_ACTIVATION_THRESHOLD_COUNT   50

LIMIT_UNSAFE_WARNING_ACTIVATION_TIMEOUT

#define LIMIT_UNSAFE_WARNING_ACTIVATION_TIMEOUT   50

MY_OFF_T_UNDEF

#define MY_OFF_T_UNDEF   (~(my_off_t)0UL)

Enumeration Type Documentation

enum_read_gtids_from_binlog_status

enum enum_read_gtids_from_binlog_status

Enumerator
GOT_GTIDS
GOT_PREVIOUS_GTIDS
NO_GTIDS
ERROR
TRUNCATED

Function Documentation

MYSQL_BIN_LOG()

MYSQL_BIN_LOG::MYSQL_BIN_LOG	(	uint *	sync_period,
		bool	relay_log = false
	)

~MYSQL_BIN_LOG()

MYSQL_BIN_LOG::~MYSQL_BIN_LOG ( )

override

add_log_to_index()

int MYSQL_BIN_LOG::add_log_to_index	(	uchar *	log_name,
		size_t	log_name_len,
		bool	need_lock_index
	)

Append log file name to index file.

• To make crash safe, we copy all the content of index file to crash safe index file firstly and then append the log file name to the crash safe index file. Finally move the crash safe index file to index file.

Return values

0	ok
-1	error

add_to_binlog_accessed_dbs()

void THD::add_to_binlog_accessed_dbs

(

const char *

db_param

)

Parameters

db_param

db name c-string to be inserted into alphabetically sorted THD::binlog_accessed_db_names list.

Note, that space for both the data and the node struct are allocated in THD::main_mem_root. The list lasts for the top-level query time and is reset in THD::cleanup_after_query().

adjust_linfo_offsets()

void MYSQL_BIN_LOG::adjust_linfo_offsets

(

my_off_t

purge_offset

)

Adjust the position pointer in the binary log file for all running replicas.

SYNOPSIS adjust_linfo_offsets() purge_offset Number of bytes removed from start of log index file NOTES

• This is called when doing a PURGE when we delete lines from the index log file. This method expects the LOCK_index to be taken so there are no concurrent edits against linfo objects being iterated. REQUIREMENTS
• Before calling this function, we have to ensure that no threads are using any binary log file before purge_offset. TODO
• Inform the replica threads that they should sync the position in the binary log file with flush_relay_log_info. Now they sync is done for next read.

after_write_to_relay_log()

bool MYSQL_BIN_LOG::after_write_to_relay_log ( Master_info *  mi )

private

Called after an event has been written to the relay log by the IO thread.

This flushes and possibly syncs the file (according to the sync options), rotates the file if it has grown over the limit, and finally calls signal_update().

Note

The caller must hold LOCK_log before invoking this function.

Parameters

mi	Master_info for the IO thread.

Return values

false	success
true	error

assign_automatic_gtids_to_flush_group()

bool MYSQL_BIN_LOG::assign_automatic_gtids_to_flush_group

(

THD *

first_seen

)

Assign automatic generated GTIDs for all commit group threads in the flush stage having gtid_next.type == AUTOMATIC_GTID.

Parameters

first_seen

The first thread seen entering the flush stage.

Returns

Returns false if succeeds, otherwise true is returned.

auto_purge()

void MYSQL_BIN_LOG::auto_purge

(

)

This function runs automatic purge if the conditions to meet automatic purge are met.

The method executes logs purging routine.

Such conditions are: log is open, instance is not locked for backup and automatic purge is enabled.

If all conditions are met, purge is done according to the configuration of the purge window.

auto_purge_at_server_startup()

void MYSQL_BIN_LOG::auto_purge_at_server_startup

(

)

This member function is to be called at server startup.

It checks if purge can be done and does if it can.

binlog_close_connection()

static int binlog_close_connection ( handlerton *  hton, THD *  thd  )

static

binlog_commit()

static int binlog_commit ( handlerton *  , THD *  , bool    )

static

This function is called once after each statement.

See also

MYSQL_BIN_LOG::commit

handlerton::commit

binlog_deinit()

static int binlog_deinit ( void *  )

static

binlog_delete_row()

int THD::binlog_delete_row	(	TABLE *	table,
		bool	is_transactional,
		const uchar *	old_data,
		const unsigned char *	extra_row_info
	)

Save a reference to the original read and write set bitmaps. We will need this to restore the bitmaps at the end.

This will remove spurious fields required during execution but not needed for binlogging. This is done according to the: binlog-row-image option.

binlog_dummy_recover()

static int binlog_dummy_recover ( handlerton *  , XA_recover_txn *  , uint  , MEM_ROOT *    )

static

binlog_enabled()

bool binlog_enabled

(

)

Check whether binlog_hton has valid slot and enabled.

binlog_flush_pending_rows_event()

int THD::binlog_flush_pending_rows_event	(	bool	stmt_end,
		bool	is_transactional
	)

binlog_get_pending_rows_event()

Rows_log_event * THD::binlog_get_pending_rows_event

(

bool

is_transactional

)

const

This function retrieves a pending row event from a cache which is specified through the parameter is_transactional.

Respectively, when it is true, the pending event is returned from the transactional cache. Otherwise from the non-transactional cache.

Parameters

is_transactional

true indicates a transactional cache, otherwise false a non-transactional.

Returns

The row event if any.

binlog_init()

static int binlog_init ( void *  p )

static

binlog_prepare()

static int binlog_prepare ( handlerton *  hton, THD *  thd, bool  all  )

static

binlog_prepare_pending_rows_event()

template<class RowsEventT >

Rows_log_event * THD::binlog_prepare_pending_rows_event	(	TABLE *	table,
		uint32	serv_id,
		size_t	needed,
		bool	is_transactional,
		const unsigned char *	extra_row_info,
		uint32	source_part_id = INT_MAX
	)

binlog_prepare_row_images()

void binlog_prepare_row_images ( const THD *  thd, TABLE *  table  )

static

Remove from read_set spurious columns. The write_set has been handled before in table->mark_columns_needed_for_update.

if there is a primary key in the table (ie, user declared PK or a non-null unique index) and we dont want to ship the entire image, and the handler involved supports this.

Just to be sure that tmp_set is currently not in use as the read_set already.

NOBLOB: Remove unnecessary BLOB fields from read_set (the ones that are not part of PK).

binlog_query()

int THD::binlog_query	(	THD::enum_binlog_query_type	qtype,
		const char *	query_arg,
		size_t	query_len,
		bool	is_trans,
		bool	direct,
		bool	suppress_use,
		int	errcode
	)

Log the current query.

The query will be logged in either row format or statement format depending on the value of current_stmt_binlog_format_row field and the value of the qtype parameter.

This function must be called:

• After the all calls to ha_*_row() functions have been issued.
• After any writes to system tables. Rationale: if system tables were written after a call to this function, and the master crashes after the call to this function and before writing the system tables, then the master and slave get out of sync.
• Before tables are unlocked and closed.

See also

decide_logging_format

Return values

0	Success
nonzero	If there is a failure when writing the query (e.g., write failure), then the error code is returned.

binlog_rollback()

static int binlog_rollback ( handlerton *  hton, THD *  thd, bool  all  )

static

This function is called when a transaction or a statement is rolled back.

binlog_savepoint_rollback()

static int binlog_savepoint_rollback ( handlerton *  hton, THD *  thd, void *  sv  )

static

binlog_savepoint_rollback_can_release_mdl()

static bool binlog_savepoint_rollback_can_release_mdl ( handlerton *  , THD *  thd  )

static

Check whether binlog state allows to safely release MDL locks after rollback to savepoint.

Parameters

thd	The client thread that executes the transaction.

Returns

true - It is safe to release MDL locks. false - If it is not.

If we have not updated any non-transactional tables rollback to savepoint will simply truncate binlog cache starting from SAVEPOINT command. So it should be safe to release MDL acquired after SAVEPOINT command in this case.

binlog_savepoint_set()

static int binlog_savepoint_set ( handlerton *  , THD *  thd, void *  sv  )

static

Note

How do we handle this (unlikely but legal) case:

  [transaction] + [update to non-trans table] + [rollback to savepoint] ?

The problem occurs when a savepoint is before the update to the non-transactional table. Then when there's a rollback to the savepoint, if we simply truncate the binlog cache, we lose the part of the binlog cache where the update is. If we want to not lose it, we need to write the SAVEPOINT command and the ROLLBACK TO SAVEPOINT command to the binlog cache. The latter is easy: it's just write at the end of the binlog cache, but the former should be inserted to the place where the user called SAVEPOINT. The solution is that when the user calls SAVEPOINT, we write it to the binlog cache (so no need to later insert it). As transactions are never intermixed in the binary log (i.e. they are serialized), we won't have conflicts with savepoint names when using mysqlbinlog or in the slave SQL thread. Then when ROLLBACK TO SAVEPOINT is called, if we updated some non-transactional table, we don't truncate the binlog cache but instead write ROLLBACK TO SAVEPOINT to it; otherwise we truncate the binlog cache (which will chop the SAVEPOINT command from the binlog cache, which is good as in that case there is no need to have it in the binlog).

binlog_set_prepared_in_tc()

static int binlog_set_prepared_in_tc ( handlerton *  hton, THD *  thd  )

static

binlog_setup_trx_data()

int THD::binlog_setup_trx_data

(

)

binlog_start_trans_and_stmt()

static int binlog_start_trans_and_stmt ( THD *  thd, Log_event *  start_event  )

static

Function to start a statement and optionally a transaction for the binary log.

This function does three things:

• Starts a transaction if not in autocommit mode or if a BEGIN statement has been seen.
• Start a statement transaction to allow us to truncate the cache.

• Save the current binlog position so that we can roll back the statement by truncating the cache.

  We only update the saved position if the old one was undefined, the reason is that there are some cases (e.g., for CREATE-SELECT) where the position is saved twice (e.g., both in Query_result_create::prepare() and THD::binlog_write_table_map()), but we should use the first. This means that calls to this function can be used to start the statement before the first table map event, to include some extra events.

Note however that IMMEDIATE_LOGGING implies that the statement is written without BEGIN/COMMIT.

Parameters

thd	Thread variable
start_event	The first event requested to be written into the binary log

binlog_trans_log_savepos()

static void binlog_trans_log_savepos ( THD *  thd, my_off_t *  pos  )

static

binlog_update_row()

int THD::binlog_update_row	(	TABLE *	table,
		bool	is_transactional,
		const uchar *	old_data,
		const uchar *	new_data,
		const uchar *	extra_row_info
	)

Save a reference to the original read and write set bitmaps. We will need this to restore the bitmaps at the end.

This will remove spurious fields required during execution but not needed for binlogging. This is done according to the: binlog-row-image option.

binlog_write_row()

int THD::binlog_write_row	(	TABLE *	table,
		bool	is_transactional,
		const uchar *	new_data,
		const unsigned char *	extra_row_info
	)

binlog_write_table_map()

int THD::binlog_write_table_map	(	TABLE *	table,
		bool	is_transactional,
		bool	binlog_rows_query
	)

This function writes a table map to the binary log.

Note that in order to keep the signature uniform with related methods, we use a redundant parameter to indicate whether a transactional table was changed or not. Sometimes it will write a Rows_query_log_event into binary log before the table map too.

Parameters

table	a pointer to the table.
is_transactional	true indicates a transactional table, otherwise false a non-transactional.
binlog_rows_query	true indicates a Rows_query log event will be binlogged before table map, otherwise false indicates it will not be binlogged.

Returns

nonzero if an error pops up when writing the table map event or the Rows_query log event.

calculate_auto_purge_lower_time_bound()

static time_t calculate_auto_purge_lower_time_bound ( )

static

This function abstracts the calculation of the binary log files retention lower bound.

It is just a function that makes it easier to handle the fact that there are two mutually exclusive variables that control the purge period and one of them is deprecated.

NOTE: This function and part of the purge validation functions should really move to a retention policy class that abstracts the retention policy altogether and its controls. Perhaps we can do that once expire_logs_days is removed and a refactoring is done to also include retention based on storage space occupied. Then we can uses the same retention abstraction for binary and relay logs and possibly extend the options to retain (binary) log files not only based on time, but also on space used.

Returns

time_t the time after which log files are considered expired.

call_after_sync_hook()

static int call_after_sync_hook ( THD *  queue_head )

inlinestatic

Auxiliary function used in ordered_commit.

change_stage()

bool MYSQL_BIN_LOG::change_stage ( THD *  thd, Commit_stage_manager::StageID  stage, THD *  queue, mysql_mutex_t *  leave_mutex, mysql_mutex_t *  enter_mutex  )

private

Enter a stage of the ordered commit procedure.

Entering is stage is done by:

• Atomically entering a queue of THD objects (which is just one for the first phase).
• If the queue was empty, the thread is the leader for that stage and it should process the entire queue for that stage.
• If the queue was not empty, the thread is a follower and can go waiting for the commit to finish.

The function will lock the stage mutex if the calling thread was designated leader for the phase.

Parameters

[in]	thd	Session structure
[in]	stage	The stage to enter
[in]	queue	Thread queue for the stage
[in]	leave_mutex	Mutex that will be released when changing stage
[in]	enter_mutex	Mutex that will be taken when changing stage

Return values

true	In case this thread did not become leader, the function returns true after the leader has completed the commit on its behalf, so the thread should continue doing the thread-local processing after the commit (i.e. call finish_commit).
false	The thread is the leader for the stage and should do the processing.

check_auto_purge_conditions()

static bool check_auto_purge_conditions ( )

static

Checks if automatic purge conditions are met and therefore the purge is allowed to be done.

If not met returns true. Otherwise, false.

Returns

false if the check is successful. True otherwise.

check_binlog_cache_size()

void check_binlog_cache_size

(

THD *

thd

)

Checks if the BINLOG_CACHE_SIZE's value is greater than MAX_BINLOG_CACHE_SIZE.

If this happens, the BINLOG_CACHE_SIZE is set to MAX_BINLOG_CACHE_SIZE.

check_binlog_stmt_cache_size()

void check_binlog_stmt_cache_size

(

THD *

thd

)

Checks if the BINLOG_STMT_CACHE_SIZE's value is greater than MAX_BINLOG_STMT_CACHE_SIZE.

If this happens, the BINLOG_STMT_CACHE_SIZE is set to MAX_BINLOG_STMT_CACHE_SIZE.

check_purge_conditions()

static std::pair< bool, int > check_purge_conditions ( const MYSQL_BIN_LOG &  log )

static

Checks whether purge conditions are met to be able to run purge for binary log files.

This function checks whether the binary log is open, if the instance is not locked for backup.

Parameters

log	The reference to the binary log.

Returns

std::pair<bool, int> the first element states whether there is a purge condition violation. The second element states what is the associated error code, if any.

check_trx_rw_engines()

int check_trx_rw_engines	(	THD *	thd,
		Transaction_ctx::enum_trx_scope	trx_scope
	)

Check if the transaction has no rw flag set for any of the storage engines.

Parameters

thd	The client thread that executed the current statement.
trx_scope	The transaction scope to look into.

Return values

the	number of engines which have actual changes.

check_write_error()

bool MYSQL_BIN_LOG::check_write_error

(

const THD *

thd

)

cleanup()

void MYSQL_BIN_LOG::cleanup

(

)

close() [1/2]

void MYSQL_BIN_LOG::close ( )

overridevirtual

This is called on shutdown, after ha_panic.

Implements TC_LOG.

close() [2/2]

void MYSQL_BIN_LOG::close	(	uint	exiting,
		bool	need_lock_log,
		bool	need_lock_index
	)

Close the log file.

Parameters

exiting	Bitmask for one or more of the following bits: LOG_CLOSE_INDEX : if we should close the index file LOG_CLOSE_TO_BE_OPENED : if we intend to call open at once after close. LOG_CLOSE_STOP_EVENT : write a 'stop' event to the log
need_lock_log	If true, this function acquires LOCK_log; otherwise the caller should already have acquired it.
need_lock_index	If true, this function acquires LOCK_index; otherwise the caller should already have acquired it.

Note

One can do an open on the object at once after doing a close. The internal structures are not freed until cleanup() is called

TODO(WL#7546): Change the implementation to Stop_event after write() is moved into libbinlogevents

close_crash_safe_index_file()

int MYSQL_BIN_LOG::close_crash_safe_index_file

(

)

Close the crash safe index file.

Note

The crash safe file is just closed, is not deleted. Because it is moved to index file later on.

Return values

0	ok
1	error

close_purge_index_file()

int MYSQL_BIN_LOG::close_purge_index_file

(

)

commit()

TC_LOG::enum_result MYSQL_BIN_LOG::commit ( THD *  thd, bool  all  )

overridevirtual

Commit the transaction in the transaction coordinator.

This function will commit the sessions transaction in the binary log and in the storage engines (by calling ha_commit_low). If the transaction was successfully logged (or not successfully unlogged) but the commit in the engines did not succeed, there is a risk of inconsistency between the engines and the binary log.

For binary log group commit, the commit is separated into three parts:

1. First part consists of filling the necessary caches and finalizing them (if they need to be finalized). After this, nothing is added to any of the caches.
2. Second part execute an ordered flush and commit. This will be done using the group commit functionality in ordered_commit.
3. Third part checks any errors resulting from the ordered commit and handles them appropriately.

Return values

RESULT_SUCCESS	success
RESULT_ABORTED	error, transaction was neither logged nor committed
RESULT_INCONSISTENT	error, transaction was logged but not committed

Implements TC_LOG.

compare_log_name()

static int compare_log_name ( const char *  log_1, const char *  log_2  )

static

compress()

bool binlog_cache_data::compress ( THD *  thd )

protected

Compress the current transaction "in-place", if possible.

This attempts to compress the transaction if it satisfies the necessary pre-conditions. Otherwise it does nothing.

Return values

true	Error: the cache has been corrupted and the transaction must be aborted.
false	Success: the transaction was either compressed successfully, or compression was not attempted, or compression failed and left the uncompressed transaction intact.

copy_file()

static bool copy_file ( IO_CACHE *  from, IO_CACHE *  to, my_off_t  offset  )

static

Copy content of 'from' file from offset to 'to' file.

• We do the copy outside of the IO_CACHE as the cache buffers would just make things slower and more complicated. In most cases the copy loop should only do one read.

Parameters

from	File to copy.
to	File to copy to.
offset	Offset in 'from' file.

Return values

0	ok
-1	error

dec_prep_xids()

void MYSQL_BIN_LOG::dec_prep_xids ( THD *  thd )

private

Decrement the prepared XID counter.

Signal m_prep_xids_cond if the counter reaches zero.

decide_logging_format()

int THD::decide_logging_format

(

Table_ref *

tables

)

Decide on logging format to use for the statement and issue errors or warnings as needed.

The decision depends on the following parameters:

• The logging mode, i.e., the value of binlog_format. Can be statement, mixed, or row.
• The type of statement. There are three types of statements: "normal" safe statements; unsafe statements; and row injections. An unsafe statement is one that, if logged in statement format, might produce different results when replayed on the slave (e.g., queries with a LIMIT clause). A row injection is either a BINLOG statement, or a row event executed by the slave's SQL thread.

• The capabilities of tables modified by the statement. The capabilities vector* for a table is a set of flags associated with the table. Currently, it only includes two flags: row capability flag and statement capability flag.

  The row capability flag is set if and only if the engine can handle row-based logging. The statement capability flag is set if and only if the table can handle statement-based logging.

Decision table for logging format

The following table summarizes how the format and generated warning/error depends on the tables' capabilities, the statement type, and the current binlog_format.

Row capable N NNNNNNNNN YYYYYYYYY YYYYYYYYY Statement capable N YYYYYYYYY NNNNNNNNN YYYYYYYYY

Statement type * SSSUUUIII SSSUUUIII SSSUUUIII

binlog_format * SMRSMRSMR SMRSMRSMR SMRSMRSMR

Logged format - SS-S--— -RR-RR-RR SRRSRR-RR Warning/Error 1 –2732444 5–5–6– —7–6–

Legend

Row capable: N - Some table not row-capable, Y - All tables row-capable Stmt capable: N - Some table not stmt-capable, Y - All tables stmt-capable Statement type: (S)afe, (U)nsafe, or Row (I)njection binlog_format: (S)TATEMENT, (M)IXED, or (R)OW Logged format: (S)tatement or (R)ow Warning/Error: Warnings and error messages are as follows:

1. Error: Cannot execute statement: binlogging impossible since both row-incapable engines and statement-incapable engines are involved.
2. Error: Cannot execute statement: binlogging impossible since BINLOG_FORMAT = ROW and at least one table uses a storage engine limited to statement-logging.
3. Error: Cannot execute statement: binlogging of unsafe statement is impossible when storage engine is limited to statement-logging and BINLOG_FORMAT = MIXED.
4. Error: Cannot execute row injection: binlogging impossible since at least one table uses a storage engine limited to statement-logging.
5. Error: Cannot execute statement: binlogging impossible since BINLOG_FORMAT = STATEMENT and at least one table uses a storage engine limited to row-logging.
6. Error: Cannot execute row injection: binlogging impossible since BINLOG_FORMAT = STATEMENT.
7. Warning: Unsafe statement binlogged in statement format since BINLOG_FORMAT = STATEMENT.

In addition, we can produce the following error (not depending on the variables of the decision diagram):

1. Error: Cannot execute statement: binlogging impossible since more than one engine is involved and at least one engine is self-logging.
2. Error: Do not allow users to modify a gtid_executed table explicitly by a XA transaction.

For each error case above, the statement is prevented from being logged, we report an error, and roll back the statement. For warnings, we set the thd->binlog_flags variable: the warning will be printed only if the statement is successfully logged.

See also

THD::binlog_query

Parameters

[in]

tables

Tables involved in the query

Return values

0	No error; statement can be logged.
-1	One of the error conditions above applies (1, 2, 4, 5, 6 or 9).

The number of tables used in the current statement, that should be replicated.

The number of tables written to in the current statement, that should not be replicated. A table should not be replicated when it is considered 'local' to a MySQL instance. Currently, these tables are:

• mysql.slow_log
• mysql.general_log
• mysql.slave_relay_log_info
• mysql.slave_master_info
• mysql.slave_worker_info
• performance_schema.*
• TODO: information_schema.* In practice, from this list, only performance_schema.* tables are written to by user queries.

Indicate whether we already reported a warning on modifying gtid_executed table.

do_unsafe_limit_checkout()

static void do_unsafe_limit_checkout ( char *  buf, int  unsafe_type, const char *  query  )

static

Auxiliary function to check if the warning for limit unsafety should be thrown or suppressed.

Details of the implementation can be found in the comments inline.

Parameters

buf	Buffer to hold the warning message text
unsafe_type	The type of unsafety.
query	The actual query statement.

TODO: Remove this function and implement a general service for all warnings that would prevent flooding the error log. => switch to log_throttle class?

do_write_cache()

bool MYSQL_BIN_LOG::do_write_cache ( Binlog_cache_storage *  cache, class Binlog_event_writer *  writer  )

private

Write the contents of the given IO_CACHE to the binary log.

The cache will be reset as a READ_CACHE to be able to read the contents from it.

The data will be post-processed: see class Binlog_event_writer for details.

Parameters

cache	Events will be read from this IO_CACHE.
writer	Events will be written to this Binlog_event_writer.

Return values

true	IO error.
false	Success.

See also

MYSQL_BIN_LOG::write_cache

ending_single_stmt_trans()

bool ending_single_stmt_trans	(	THD *	thd,
		const bool	all
	)

This function checks if a single statement transaction is about to commit or not.

Parameters

thd	The client thread that executed the current statement.
all	Committing a transaction (i.e. true) or a statement (i.e. false).

Returns

true if committing a single statement transaction, otherwise false.

ending_trans()

bool ending_trans	(	THD *	thd,
		const bool	all
	)

This function checks if a transaction, either a multi-statement or a single statement transaction is about to commit or not.

Parameters

thd	The client thread that executed the current statement.
all	Committing a transaction (i.e. true) or a statement (i.e. false).

Returns

true if committing a transaction, otherwise false.

exec_binlog_error_action_abort()

static void exec_binlog_error_action_abort ( const char *  err_string )

static

When a fatal error occurs due to which binary logging becomes impossible and the user specified binlog_error_action= ABORT_SERVER the following function is invoked.

This function pushes the appropriate error message to client and logs the same to server error log and then aborts the server.

Parameters

err_string

Error string which specifies the exact error message from the caller.

fetch_and_process_flush_stage_queue()

THD * MYSQL_BIN_LOG::fetch_and_process_flush_stage_queue ( const bool  check_and_skip_flush_logs = false )

private

Fetch and empty BINLOG_FLUSH_STAGE and COMMIT_ORDER_FLUSH_STAGE flush queues and flush transactions to the disk, and unblock threads executing slave preserve commit order.

Parameters

[in]

check_and_skip_flush_logs

if false then flush prepared records of transactions to the log of storage engine. if true then flush prepared records of transactions to the log of storage engine only if COMMIT_ORDER_FLUSH_STAGE queue is non-empty.

Returns

Pointer to the first session of the BINLOG_FLUSH_STAGE stage queue.

finalize() [1/3]

int binlog_stmt_cache_data::finalize

(

THD *

thd

)

finalize() [2/3]

int binlog_cache_data::finalize	(	THD *	thd,
		Log_event *	end_event
	)

This function finalizes the cache preparing for commit or rollback.

The function just writes all the necessary events to the cache but does not flush the data to the binary log file. That is the role of the binlog_cache_data::flush function.

See also

binlog_cache_data::flush

Parameters

thd	The thread whose transaction should be flushed
end_event	The end event either commit/rollback

Returns

nonzero if an error pops up when flushing the cache.

finalize() [3/3]

int binlog_cache_data::finalize	(	THD *	thd,
		Log_event *	end_event,
		XID_STATE *	xs
	)

The method writes XA END query to XA-prepared transaction's cache and calls the "basic" finalize().

Returns

error code, 0 success

find_first_log()

bool MYSQL_BIN_LOG::find_first_log	(	std::string &	binlog_file_name,
		std::string &	errmsg
	)

Find the oldest binary log referenced by the index file.

Parameters

[out]	binlog_file_name	the file name of oldest log found
[out]	errmsg	the error message outputted, which is left untouched if the function returns false

Returns

false on success, true on error.

find_first_log_not_in_gtid_set()

bool MYSQL_BIN_LOG::find_first_log_not_in_gtid_set	(	char *	binlog_file_name,
		const Gtid_set *	gtid_set,
		Gtid *	first_gtid,
		std::string &	errmsg
	)

Find the oldest binary log that contains any GTID that is not in the given gtid set.

Parameters

[out]	binlog_file_name	the file name of oldest binary log found
[in]	gtid_set	the given gtid set
[out]	first_gtid	the first GTID information from the binary log file returned at binlog_file_name
[out]	errmsg	the error message outputted, which is left untouched if the function returns false

Returns

false on success, true on error.

find_log_pos()

int MYSQL_BIN_LOG::find_log_pos	(	LOG_INFO *	linfo,
		const char *	log_name,
		bool	need_lock_index
	)

Find the position in the log-index-file for the given log name.

Parameters

[out]	linfo	The found log file name will be stored here, along with the byte offset of the next log file name in the index file.
	log_name	Filename to find in the index file, or NULL if we want to read the first entry.
	need_lock_index	If false, this function acquires LOCK_index; otherwise the lock should already be held by the caller.

Note

On systems without the truncate function the file will end with one or more empty lines. These will be ignored when reading the file.

Return values

0	ok
LOG_INFO_EOF	End of log-index-file found
LOG_INFO_IO	Got IO error while reading file

find_next_log()

int MYSQL_BIN_LOG::find_next_log	(	LOG_INFO *	linfo,
		bool	need_lock_index
	)

Find the position in the log-index-file for the given log name.

Parameters

[out]	linfo	The filename will be stored here, along with the byte offset of the next filename in the index file.
	need_lock_index	If true, LOCK_index will be acquired; otherwise it should already be held by the caller.

Note

• Before calling this function, one has to call find_log_pos() to set up 'linfo'
• Mutex needed because we need to make sure the file pointer does not move from under our feet

Return values

0	ok
LOG_INFO_EOF	End of log-index-file found
LOG_INFO_IO	Got IO error while reading file

find_next_relay_log()

int MYSQL_BIN_LOG::find_next_relay_log

(

char

log_name[FN_REFLEN+1]

)

Find the relay log name following the given name from relay log index file.

Parameters

[in,out]

log_name

The name is full path name.

Returns

return 0 if it finds next relay log. Otherwise return the error code.

find_uniq_filename()

static int find_uniq_filename ( char *  name, uint32  new_index_number  )

static

Find a unique filename for 'filename.

#'.

Set '#' to the highest existing log file extension plus one.

This function will return nonzero if: (i) the generated name exceeds FN_REFLEN; (ii) if the number of extensions is exhausted; or (iii) some other error happened while examining the filesystem.

Returns

nonzero if not possible to get unique filename.

finish_commit()

int MYSQL_BIN_LOG::finish_commit ( THD *  thd )

private

Helper function executed when leaving ordered_commit.

This function contain the necessary code for fetching the error code, doing post-commit checks, and wrapping up the commit if necessary.

It is typically called when enter_stage indicates that the thread should bail out, and also when the ultimate leader thread finishes executing ordered_commit.

It is typically used in this manner:

if (enter_stage(thd, Thread_queue::BINLOG_FLUSH_STAGE, thd, &LOCK_log))
  return finish_commit(thd);

Returns

Error code if the session commit failed, or zero on success.

flush() [1/2]

bool MYSQL_BIN_LOG::flush

(

)

flush() [2/2]

int binlog_cache_data::flush	(	THD *	thd,
		my_off_t *	bytes_written,
		bool *	wrote_xid,
		bool	parallelization_barrier
	)

Flush caches to the binary log.

If the cache is finalized, the cache will be flushed to the binary log file. If the cache is not finalized, nothing will be done.

If flushing fails for any reason, an error will be reported and the cache will be reset. Flushing can fail in the following circumstances:

• It was not possible to write the cache to the file. In this case, it does not make sense to keep the cache.

See also

binlog_cache_data::finalize

flush_and_set_pending_rows_event()

int MYSQL_BIN_LOG::flush_and_set_pending_rows_event	(	THD *	thd,
		Rows_log_event *	event,
		bool	is_transactional
	)

flush_and_sync()

bool MYSQL_BIN_LOG::flush_and_sync

(

const bool

force = false

)

Flush binlog cache and synchronize to disk.

This function flushes events in binlog cache to binary log file, it will do synchronizing according to the setting of system variable 'sync_binlog'. If file is synchronized, synced will be set to 1, otherwise 0.

Parameters

[in]

force

if true, ignores the 'sync_binlog' and synchronizes the file.

Return values

0	Success
other	Failure

flush_cache_to_file()

int MYSQL_BIN_LOG::flush_cache_to_file ( my_off_t *  end_pos_var )

private

Flush the I/O cache to file.

Flush the binary log to the binlog file if any byte where written and signal that the binary log file has been updated if the flush succeeds.

flush_thread_caches()

std::pair< int, my_off_t > MYSQL_BIN_LOG::flush_thread_caches ( THD *  thd )

private

Flush caches for session.

Note

set_trans_pos is called with a pointer to the file name that the binary log currently use and a rotation will change the contents of the variable.

The position is used when calling the after_flush, after_commit, and after_rollback hooks, but these have been placed so that they occur before a rotation is executed.

It is the responsibility of any plugin that use this position to copy it if they need it after the hook has returned.

The current "global" transaction_counter is stepped and its new value is assigned to the transaction.

fulltext_unsafe_set()

static bool fulltext_unsafe_set ( TABLE_SHARE *  s )

inlinestatic

generate_name()

const char * MYSQL_BIN_LOG::generate_name	(	const char *	log_name,
		const char *	suffix,
		char *	buff
	)

generate_new_name()

int MYSQL_BIN_LOG::generate_new_name ( char *  new_name, const char *  log_name, uint32  new_index_number = 0  )

private

get_current_log()

int MYSQL_BIN_LOG::get_current_log	(	LOG_INFO *	linfo,
		bool	need_lock_log = true
	)

get_gtid_executed()

int MYSQL_BIN_LOG::get_gtid_executed	(	Sid_map *	sid_map,
		Gtid_set *	gtid_set
	)

Deep copy global_sid_map and gtid_executed.

Both operations are done under LOCK_commit and global_sid_lock protection.

Parameters

[out]	sid_map	The Sid_map to which global_sid_map will be copied.
[out]	gtid_set	The Gtid_set to which gtid_executed will be copied.

Returns

the operation status

Return values

0	OK
!=0	Error

get_locked_tables_mode_name()

const char * get_locked_tables_mode_name

(

enum_locked_tables_mode

locked_tables_mode

)

Getter for the enum enum_locked_tables_mode.

Parameters

locked_tables_mode

enum for types of locked tables mode

Returns

The string representation of that enum value

get_log_index()

std::pair< int, std::list< std::string > > MYSQL_BIN_LOG::get_log_index

(

bool

need_lock_index = true

)

Retrieves the contents of the index file associated with this log object into an std::list<std::string> object.

The order held by the index file is kept.

Parameters

need_lock_index

whether or not the lock over the index file should be acquired inside the function.

Returns

a pair: a function status code; a list of std::string objects with the content of the log index file.

get_xa_opt()

enum xa_option_words get_xa_opt ( THD *  thd )

inline

gtid_end_transaction()

int MYSQL_BIN_LOG::gtid_end_transaction

(

THD *

thd

)

If the thread owns a GTID, this function generates an empty transaction and releases ownership of the GTID.

• If the binary log is disabled for this thread, the GTID is inserted directly into the mysql.gtid_executed table and the GTID is included in @global.gtid_executed. (This only happens for DDL, since DML will save the GTID into table and release ownership inside ha_commit_trans.)
• If the binary log is enabled for this thread, an empty transaction consisting of GTID, BEGIN, COMMIT is written to the binary log, the GTID is included in @global.gtid_executed, and the GTID is added to the mysql.gtid_executed table on the next binlog rotation.

This function must be called by any committing statement (COMMIT, implicitly committing statements, or Xid_log_event), after the statement has completed execution, regardless of whether the statement updated the database.

This logic ensures that an empty transaction is generated for the following cases:

• Explicit empty transaction: SET GTID_NEXT = 'UUID:NUMBER'; BEGIN; COMMIT;
• Transaction or DDL that gets completely filtered out in the slave thread.

Parameters

thd	The committing thread

Return values

0	Success
nonzero	Error

handle_binlog_flush_or_sync_error()

void MYSQL_BIN_LOG::handle_binlog_flush_or_sync_error ( THD *  thd, bool  need_lock_log, const char *  message  )

private

Helper function to handle flush or sync stage errors.

If binlog_error_action= ABORT_SERVER, server will be aborted after reporting the error to the client. If binlog_error_action= IGNORE_ERROR, binlog will be closed for the reset of the life time of the server. close() call is protected with LOCK_log to avoid any parallel operations on binary log.

Parameters

thd	Thread object that faced flush/sync error
need_lock_log	> Indicates true if LOCk_log is needed before closing binlog (happens when we are handling sync error) > Indicates false if LOCK_log is already acquired by the thread (happens when we are handling flush error)
message	Message stating the reason of the failure

handle_deferred_cache_write_incident()

int binlog_cache_mngr::handle_deferred_cache_write_incident

(

THD *

thd

)

Handle previous failure writing cache, aka.

incident.

Failure writing to the cache in a statement which can't be rolled-back is handled by setting the 'incident' flag on the cache. In this way the error is deferred and handled later by calling this function which replaces the incomplete cache content with an Incident_log_event.

It's also possible for any session to mark the cache as having an incident and thus trigger this functionality. The main user of this is the NDB binlog which need to write incident(s) when the NDB connection state changes or when other fatal error occurs, @see BINLOG::write_incident_commit.

Parameters

thd	Thread variable

Return values

0	Success.
non-zero	Error occured writing to cache

Note

This function handles previous error while writing to the cache by attempting to write (something hopefully smaller) to the cache and thus it may also fail, but at least an attempt has been made to get something sensible into the cache. Returning error invokes binlog_error_action.

Construct the Incident_log_event before reset()

handle_gtid_consistency_violation()

static bool handle_gtid_consistency_violation ( THD *  thd, int  error_code, int  log_error_code  )

static

Given that a possible violation of gtid consistency has happened, checks if gtid-inconsistencies are forbidden by the current value of ENFORCE_GTID_CONSISTENCY and GTID_MODE.

If forbidden, generates error or warning accordingly.

Parameters

thd	The thread that has issued the GTID-violating statement.
error_code	The error code to use, if error or warning is to be generated.
log_error_code	The error code to use, if error message is to be logged.

Return values

false	Error was generated.
true	No error was generated (possibly a warning was generated).

harvest_bytes_written()

void MYSQL_BIN_LOG::harvest_bytes_written	(	Relay_log_info *	rli,
		bool	need_log_space_lock
	)

Adds bytes written in the current relay log into the variable handling the total number of bytes acquired by the replica.

Resets the counter of bytes written. If requested by caller, acquires relay log space lock

Parameters

rli	Pointer to the applier metadata object
need_log_space_lock	Information on whether to acquire the lock protecting data responsible for keeping the relay log space at bay

has_acl_table_read()

static bool has_acl_table_read ( THD *  thd, const Table_ref *  tl_list  )

static

Checks if we have reads from ACL tables in table list.

Parameters

thd	Current thread
tl_list	Table_ref used by current command.

Returns

true, if we statement is unsafe, otherwise false.

has_incident()

bool binlog_cache_data::has_incident

(

void

)

const

See also

handle_deferred_cache_write_incident

has_nondeterministic_default()

static bool has_nondeterministic_default ( const TABLE *  table )

static

Checks if a table has a column with a non-deterministic DEFAULT expression.

has_write_table_auto_increment_not_first_in_pk()

static bool has_write_table_auto_increment_not_first_in_pk ( Table_ref *  tables )

static

has_write_table_with_auto_increment()

static bool has_write_table_with_auto_increment ( Table_ref *  tables )

static

has_write_table_with_auto_increment_and_query_block()

static bool has_write_table_with_auto_increment_and_query_block ( Table_ref *  tables )

static

has_write_table_with_nondeterministic_default()

static bool has_write_table_with_nondeterministic_default ( const Table_ref *  tables )

static

Checks if a Table_ref contains a table that has been opened for writing, and that has a column with a non-deterministic DEFAULT expression.

inc_prep_xids()

void MYSQL_BIN_LOG::inc_prep_xids ( THD *  thd )

private

Increment the prepared XID counter.

init_and_set_log_file_name()

bool MYSQL_BIN_LOG::init_and_set_log_file_name ( const char *  log_name, const char *  new_name, uint32  new_index_number  )

private

init_gtid_sets()

bool MYSQL_BIN_LOG::init_gtid_sets	(	Gtid_set *	gtid_set,
		Gtid_set *	lost_groups,
		bool	verify_checksum,
		bool	need_lock,
		Transaction_boundary_parser *	trx_parser,
		Gtid_monitoring_info *	partial_trx,
		bool	is_server_starting = false
	)

Reads the set of all GTIDs in the binary/relay log, and the set of all lost GTIDs in the binary log, and stores each set in respective argument.

Parameters

	gtid_set	Will be filled with all GTIDs in this binary/relay log.
	lost_groups	Will be filled with all GTIDs in the Previous_gtids_log_event of the first binary log that has a Previous_gtids_log_event. This is requested to binary logs but not to relay logs.
	verify_checksum	If true, checksums will be checked.
	need_lock	If true, LOCK_log, LOCK_index, and global_sid_lock->wrlock are acquired; otherwise they are asserted to be taken already.
[out]	trx_parser	This will be used to return the actual relaylog transaction parser state because of the possibility of partial transactions.
[out]	partial_trx	If a transaction was left incomplete on the relaylog, its GTID information should be returned to be used in the case of the rest of the transaction be added to the relaylog.
	is_server_starting	True if the server is starting.

Returns

false on success, true on error.

init_pthread_objects()

void MYSQL_BIN_LOG::init_pthread_objects

(

)

init_thd_variables()

void MYSQL_BIN_LOG::init_thd_variables ( THD *  thd, bool  all, bool  skip_commit  )

private

Set thread variables used while flushing a transaction.

Parameters

[in]	thd	thread whose variables need to be set
[in]	all	This is true if this is a real transaction commit, and false otherwise.
[in]	skip_commit	This is true if the call to ha_commit_low should be skipped (it is handled by the caller somehow) and false otherwise (the normal case).

is_active()

bool MYSQL_BIN_LOG::is_active

(

const char *

log_file_name

)

const

Check if we are writing/reading to the given log file.

is_binlog_cache_empty()

bool THD::is_binlog_cache_empty

(

bool

is_transactional

)

const

Return true if the statement/transaction cache is currently empty, false otherwise.

Parameters

is_transactional

if true, check the transaction cache. If false, check the statement cache.

is_current_stmt_binlog_enabled_and_caches_empty()

bool MYSQL_BIN_LOG::is_current_stmt_binlog_enabled_and_caches_empty

(

const THD *

thd

)

const

Checks whether binlog caches are disabled (binlog does not cache data) or empty in case binloggging is enabled in the current call to this function.

This function may be safely called in case binlogging is disabled.

Return values

true	binlog local caches are empty or disabled and binlogging is enabled
false	binlog local caches are enabled and contain data or binlogging is disabled

is_ddl_gtid_compatible()

bool THD::is_ddl_gtid_compatible

(

)

is_dml_gtid_compatible()

bool THD::is_dml_gtid_compatible	(	bool	some_transactional_table,
		bool	some_non_transactional_table,
		bool	non_transactional_tables_are_tmp
	)

is_dml_gtid_compatible() and is_ddl_gtid_compatible() check if the statement that is about to be processed will safely get a GTID.

Currently, the following cases may lead to errors (e.g. duplicated GTIDs) and as such are forbidden:

1. DML statements that mix non-transactional updates with transactional updates.
2. Transactions that use non-transactional tables after having used transactional tables.
3. CREATE...SELECT statement;
4. CREATE TEMPORARY TABLE or DROP TEMPORARY TABLE within a transaction

The first two conditions have to be checked in decide_logging_format, because that's where we know if the table is transactional or not. These are implemented in is_dml_gtid_compatible().

The third and fourth conditions have to be checked in mysql_execute_command because (1) that prevents implicit commit from being executed if the statement fails; (2) DROP TEMPORARY TABLE does not invoke decide_logging_format. These are implemented in is_ddl_gtid_compatible().

In the cases where GTID violations generate errors, is_ddl_gtid_compatible() needs to be called before the implicit pre-commit, so that there is no implicit commit if the statement fails.

In the cases where GTID violations do not generate errors, is_ddl_gtid_compatible() needs to be called after the implicit pre-commit, because in these cases the function will increase the global counter automatic_gtid_violating_transaction_count or anonymous_gtid_violating_transaction_count. If there is an ongoing transaction, the implicit commit will commit the transaction, which will call update_gtids_impl, which should decrease the counters depending on whether the old was violating GTID-consistency or not. Thus, we should increase the counters only after the old transaction is committed.

Parameters

some_transactional_table	true if the statement updates some transactional table; false otherwise.
some_non_transactional_table	true if the statement updates some non-transactional table; false otherwise.
non_transactional_tables_are_tmp	true if all updated non-transactional tables are temporary.

Return values

true	if the statement is compatible;
false	if the statement is not compatible.

is_empty_transaction_in_binlog_cache()

bool is_empty_transaction_in_binlog_cache

(

const THD *

thd

)

Check if at least one of transacaction and statement binlog caches contains an empty transaction, other one is empty or contains an empty transaction, which has two binlog events "BEGIN" and "COMMIT".

Parameters

thd	The client thread that executed the current statement.

Return values

true	At least one of transacaction and statement binlog caches contains an empty transaction, other one is empty or contains an empty transaction.
false	Otherwise.

is_inited_purge_index_file()

bool MYSQL_BIN_LOG::is_inited_purge_index_file

(

)

is_loggable_xa_prepare()

bool is_loggable_xa_prepare ( THD *  thd )

inlinestatic

Predicate function yields true when XA transaction is being logged having a proper state ready for prepare or commit in one phase.

Parameters

thd	THD pointer of running transaction

Returns

true When the being prepared transaction should be binlogged, false otherwise.

is_number()

static bool is_number ( const char *  str, ulong *  res, bool  allow_wildcards  )

static

Check if a string is a valid number.

Parameters

str	String to test
res	Store value here
allow_wildcards	Set to 1 if we should ignore '' and '_'

Note

For the moment the allow_wildcards argument is not used Should be moved to some other file.

Return values

1	String is a number
0	String is not a number

is_query_in_union()

bool MYSQL_BIN_LOG::is_query_in_union	(	THD *	thd,
		query_id_t	query_id_param
	)

is_transaction_empty()

bool is_transaction_empty

(

THD *

thd

)

Check if the the transaction is empty.

Parameters

thd	The client thread that executed the current statement.

Return values

true	No changes found in any storage engine
false	Otherwise.

issue_unsafe_warnings()

void THD::issue_unsafe_warnings

(

)

Auxiliary method used by binlog_query() to raise warnings.

The type of warning and the type of unsafeness is stored in THD::binlog_unsafe_warning_flags.

log_in_use()

int MYSQL_BIN_LOG::log_in_use

(

const char *

log_name

)

Check if any threads use log name.

Note

This method expects the LOCK_index to be taken so there are no concurrent edits against linfo objects being iterated

Parameters

log_name

name of a log which is checked for usage

log_loaded_block()

int log_loaded_block

(

IO_CACHE *

file

)

Load data's io cache specific hook to be executed before a chunk of data is being read into the cache's buffer The function instantiates and writes into the binlog replication events along LOAD DATA processing.

Parameters

file	pointer to io-cache

Return values

0	success
1	failure

make_log_name()

void MYSQL_BIN_LOG::make_log_name	(	char *	buf,
		const char *	log_ident
	)

Create a new log file name.

Parameters

[out]	buf	Buffer allocated with at least FN_REFLEN bytes where new name is stored.
	log_ident	Identity of the binary/relay log.

Note

If file name will be longer then FN_REFLEN it will be truncated

move_crash_safe_index_file_to_index_file()

int MYSQL_BIN_LOG::move_crash_safe_index_file_to_index_file

(

bool

need_lock_index

)

Move crash safe index file to index file.

Parameters

need_lock_index

If true, LOCK_index will be acquired; otherwise it should already be held.

Return values

0	ok
-1	error

mysql_show_binlog_events()

bool mysql_show_binlog_events

(

THD *

thd

)

Execute a SHOW BINLOG EVENTS statement.

Parameters

thd	Pointer to THD object for the client thread executing the statement.

Return values

false	success
true	failure

new_file()

int MYSQL_BIN_LOG::new_file

(

Format_description_log_event *

extra_description_event

)

new_file_impl()

int MYSQL_BIN_LOG::new_file_impl ( bool  need_lock_log, Format_description_log_event *  extra_description_event  )

private

Start writing to a new log file or reopen the old file.

Parameters

need_lock_log	If true, this function acquires LOCK_log; otherwise the caller should already have acquired it.
extra_description_event	The master's FDE to be written by the I/O thread while creating a new relay log file. This should be NULL for binary log files.

Return values

0	success
nonzero	- error

Note

The new file name is stored last in the index file

new_file_without_locking()

int MYSQL_BIN_LOG::new_file_without_locking

(

Format_description_log_event *

extra_description_event

)

next_file_id()

uint MYSQL_BIN_LOG::next_file_id

(

)

normalize_binlog_name()

bool normalize_binlog_name	(	char *	to,
		const char *	from,
		bool	is_relay_log
	)

Turns a relative log binary log path into a full path, based on the opt_bin_logname or opt_relay_logname.

Also trims the cr-lf at the end of the full_path before return to avoid any server startup problem on windows.

Parameters

from	The log name we want to make into an absolute path.
to	The buffer where to put the results of the normalization.
is_relay_log	Switch that makes is used inside to choose which option (opt_bin_logname or opt_relay_logname) to use when calculating the base path.

Returns

true if a problem occurs, false otherwise.

open()

bool MYSQL_BIN_LOG::open ( PSI_file_key  log_file_key, const char *  log_name, const char *  new_name, uint32  new_index_number  )

private

Open the logfile and init IO_CACHE.

Parameters

log_file_key	The file instrumentation key for this file
log_name	The name of the log to open
new_name	The new name for the logfile. NULL forces generate_new_name() to be called.
new_index_number	The binary log file index number to start from after the RESET MASTER TO command is called.

Returns

true if error, false otherwise.

open_binlog() [1/2]

bool MYSQL_BIN_LOG::open_binlog	(	const char *	log_name,
		const char *	new_name,
		ulong	max_size_arg,
		bool	null_created_arg,
		bool	need_lock_index,
		bool	need_sid_lock,
		Format_description_log_event *	extra_description_event,
		uint32	new_index_number = 0
	)

Create a new binary log.

Open a (new) binlog file.

Parameters

log_name	Name of binlog
new_name	Name of binlog, too. todo: what's the difference between new_name and log_name?
max_size_arg	The size at which this binlog will be rotated.
null_created_arg	If false, and a Format_description_log_event is written, then the Format_description_log_event will have the timestamp 0. Otherwise, it the timestamp will be the time when the event was written to the log.
need_lock_index	If true, LOCK_index is acquired; otherwise LOCK_index must be taken by the caller.
need_sid_lock	If true, the read lock on global_sid_lock will be acquired. Otherwise, the caller must hold the read lock on global_sid_lock.
extra_description_event	The master's FDE to be written by the I/O thread while creating a new relay log file. This should be NULL for binary log files.
new_index_number	The binary log file index number to start from after the RESET MASTER TO command is called.

• Open the log file and the index file. Register the new file name in it
• When calling this when the file is in use, you must have a locks on LOCK_log and LOCK_index.

Return values

0	ok
1	error

Perhaps we might need the code below in MYSQL_BIN_LOG::cleanup for "real life" purposes as well?

open_binlog() [2/2]

int MYSQL_BIN_LOG::open_binlog

(

const char *

opt_name

)

open_crash_safe_index_file()

int MYSQL_BIN_LOG::open_crash_safe_index_file

(

)

Open a (new) crash safe index file.

Note

The crash safe index file is a special file used for guaranteeing index file crash safe.

Return values

0	ok
1	error

open_index_file()

bool MYSQL_BIN_LOG::open_index_file	(	const char *	index_file_name_arg,
		const char *	log_name,
		bool	need_lock_index
	)

open_purge_index_file()

int MYSQL_BIN_LOG::open_purge_index_file

(

bool

destroy

)

ordered_commit()

int MYSQL_BIN_LOG::ordered_commit ( THD *  thd, bool  all, bool  skip_commit = false  )

private

Flush and commit the transaction.

This will execute an ordered flush and commit of all outstanding transactions and is the main function for the binary log group commit logic. The function performs the ordered commit in four stages.

Pre-condition: transactions should have called ha_prepare_low, using HA_IGNORE_DURABILITY, before entering here.

Stage#0 implements replica-preserve-commit-order for applier threads that write the binary log. i.e. it forces threads to enter the queue in the correct commit order.

The stage#1 flushes the caches to the binary log and under LOCK_log and marks all threads that were flushed as not pending.

The stage#2 syncs the binary log for all transactions in the group.

The stage#3 executes under LOCK_commit and commits all transactions in order.

There are three queues of THD objects: one for each stage. The Commit_order_manager maintains it own queue and its own order for the commit. So Stage#0 doesn't maintain separate StageID.

When a transaction enters a stage, it adds itself to a queue. If the queue was empty so that this becomes the first transaction in the queue, the thread is the leader of the queue. Otherwise it is a follower. The leader will do all work for all threads in the queue, and the followers will wait until the last stage is finished.

Stage 0 (SLAVE COMMIT ORDER):

1. If replica-preserve-commit-order and is slave applier worker thread, then waits until its turn to commit i.e. till it is on the top of the queue.
2. When it reaches top of the queue, it signals next worker in the commit order queue to awake.

Stage 1 (FLUSH):

1. Sync the engines (ha_flush_logs), since they prepared using non-durable settings (HA_IGNORE_DURABILITY).
2. Generate GTIDs for all transactions in the queue.
3. Write the session caches for all transactions in the queue to the binary log.
4. Increment the counter of prepared XIDs.

Stage 2 (SYNC):

1. If it is time to sync, based on the sync_binlog option, sync the binlog.
2. If sync_binlog==1, signal dump threads that they can read up to the position after the last transaction in the queue

Stage 3 (COMMIT): This is performed by each thread separately, if binlog_order_commits=0. Otherwise by the leader does it for all threads.

1. Call the after_sync hook.
2. update the max_committed counter in the dependency_tracker
3. call ha_commit_low
4. Call the after_commit hook
5. Update gtids
6. Decrement the counter of prepared transactions

If the binary log needs to be rotated, it is done after this. During rotation, it takes a lock that prevents new commit groups from executing the flush stage, and waits until the counter of prepared transactions becomes 0, before it creates the new file.

Parameters

[in]	thd	Session to commit transaction for
[in]	all	This is true if this is a real transaction commit, and false otherwise.
[in]	skip_commit	This is true if the call to ha_commit_low should be skipped and false otherwise (the normal case).

After commit stage

prepare()

int MYSQL_BIN_LOG::prepare ( THD *  thd, bool  all  )

overridevirtual

Log a prepare record of the transaction to the storage engines.

Parameters

thd	Session to log transaction record for.
all	true if an explicit commit or an implicit commit for a statement, false if an internal commit of the statement.

Returns

Error code on failure, zero on success.

Implements TC_LOG.

print_unsafe_warning_to_log()

static void print_unsafe_warning_to_log ( int  unsafe_type, char *  buf, const char *  query  )

static

Auxiliary function to print warning in the error log.

process_after_commit_stage_queue()

void MYSQL_BIN_LOG::process_after_commit_stage_queue ( THD *  thd, THD *  first  )

private

Process after commit for a sequence of sessions.

Parameters

thd	The "master" thread
first	First thread in the queue of threads to commit

process_commit_stage_queue()

void MYSQL_BIN_LOG::process_commit_stage_queue ( THD *  thd, THD *  first  )

private

Commit a sequence of sessions.

This function commit an entire queue of sessions starting with the session in first. If there were an error in the flushing part of the ordered commit, the error code is passed in and all the threads are marked accordingly (but not committed).

It will also add the GTIDs of the transactions to gtid_executed.

See also

MYSQL_BIN_LOG::ordered_commit

Parameters

thd	The "master" thread
first	First thread in the queue of threads to commit

process_flush_stage_queue()

int MYSQL_BIN_LOG::process_flush_stage_queue ( my_off_t *  total_bytes_var, THD **  out_queue_var  )

private

Execute the flush stage.

Parameters

[out]	total_bytes_var	Pointer to variable that will be set to total number of bytes flushed, or NULL.
[out]	out_queue_var	Pointer to the sessions queue in flush stage.

Returns

Error code on error, zero on success

purge_error_message()

static bool purge_error_message ( THD *  thd, int  res  )

static

purge_index_entry()

int MYSQL_BIN_LOG::purge_index_entry	(	THD *	thd,
		ulonglong *	decrease_log_space,
		bool	need_lock_index
	)

purge_log_get_error_code()

static uint purge_log_get_error_code ( int  res )

static

purge logs, master and slave sides both, related error code converter.

Called from purge_error_message(), MYSQL_BIN_LOG::reset_logs()

Parameters

res	an error code as used by purging routines

Returns

the user level error code ER_*

purge_logs()

int MYSQL_BIN_LOG::purge_logs	(	const char *	to_log,
		bool	included,
		bool	need_lock_index,
		bool	need_update_threads,
		ulonglong *	decrease_log_space,
		bool	auto_purge
	)

Remove all logs before the given log from disk and from the index file.

Parameters

to_log	Delete all log file name before this file.
included	If true, to_log is deleted too.
need_lock_index	Set to true, if the lock_index of the binary log shall be acquired, false if the called is already the owner of the lock_index.
need_update_threads	If we want to update the log coordinates of all threads. False for relay logs, true otherwise.
decrease_log_space	If not null, decrement this variable of the amount of log space freed
auto_purge	True if this is an automatic purge.

Note

If any of the logs before the deleted one is in use, only purge logs up to this one.

Return values

0	ok
LOG_INFO_EOF	to_log not found
LOG_INFO_EMFILE	too many files opened
LOG_INFO_FATAL	if any other than ENOENT error from mysql_file_stat() or mysql_file_delete()

purge_logs_before_date()

int MYSQL_BIN_LOG::purge_logs_before_date	(	time_t	purge_time,
		bool	auto_purge
	)

Remove all logs before the given file date from disk and from the index file.

Parameters

purge_time	Delete all log files before given date.
auto_purge	True if this is an automatic purge.

Note

If any of the logs before the deleted one is in use, only purge logs up to this one.

Return values

0	ok
LOG_INFO_PURGE_NO_ROTATE	Binary file that can't be rotated LOG_INFO_FATAL if any other than ENOENT error from mysql_file_stat() or mysql_file_delete()

purge_source_logs_before_date()

bool purge_source_logs_before_date	(	THD *	thd,
		time_t	purge_time
	)

Execute a PURGE BINARY LOGS BEFORE <date> command.

Parameters

thd	Pointer to THD object for the client thread executing the statement.
purge_time	Date before which logs should be purged.

Return values

false	success
true	failure

purge_source_logs_to_file()

bool purge_source_logs_to_file	(	THD *	thd,
		const char *	to_log
	)

Execute a PURGE BINARY LOGS TO <log> command.

Purges the binary log files up to the file name passed as a paramenter.

Parameters

thd	Pointer to THD object for the client thread executing the statement.
to_log	Name of the last log to purge.

Return values

false	success
true	failure

query_error_code()

int query_error_code	(	const THD *	thd,
		bool	not_killed
	)

raw_get_current_log()

int MYSQL_BIN_LOG::raw_get_current_log

(

LOG_INFO *

linfo

)

read_binlog_in_use_flag()

bool MYSQL_BIN_LOG::read_binlog_in_use_flag ( Binlog_file_reader &  binlog_file_reader )

private

Read binary log stream header and Format_desc event from binlog_file_reader.

Check for LOG_EVENT_BINLOG_IN_USE_F flag.

Parameters

[in]

binlog_file_reader

Returns

true - LOG_EVENT_BINLOG_IN_USE_F is set false - LOG_EVENT_BINLOG_IN_USE_F is not set or an error occurred while reading log events

read_gtids_and_update_trx_parser_from_relaylog()

static bool read_gtids_and_update_trx_parser_from_relaylog ( const char *  filename, Gtid_set *  retrieved_gtids, bool  verify_checksum, Transaction_boundary_parser *  trx_parser, Gtid_monitoring_info *  partial_trx  )

static

Add the GTIDs from the given relaylog file and also update the IO thread transaction parser.

Parameters

filename	Relaylog file to read from.
retrieved_gtids	Gtid_set to store the GTIDs found on the relaylog file.
verify_checksum	Set to true to verify event checksums.
trx_parser	The transaction boundary parser to be used in order to only add a GTID to the gtid_set after ensuring the transaction is fully stored on the relay log.
partial_trx	The trx_monitoring_info of the last incomplete transaction found in the relay log.

Return values

false	The file was successfully read and all GTIDs from Previous_gtids and Gtid_log_event from complete transactions were added to the retrieved_set.
true	There was an error during the procedure.

read_gtids_from_binlog()

static enum_read_gtids_from_binlog_status read_gtids_from_binlog ( const char *  filename, Gtid_set *  all_gtids, Gtid_set *  prev_gtids, Gtid *  first_gtid, Sid_map *  sid_map, bool  verify_checksum, bool  is_relay_log  )

static

Reads GTIDs from the given binlog file.

Parameters

filename	File to read from.
all_gtids	If not NULL, then the GTIDs from the Previous_gtids_log_event and from all Gtid_log_events are stored in this object.
prev_gtids	If not NULL, then the GTIDs from the Previous_gtids_log_events are stored in this object.
first_gtid	If not NULL, then the first GTID information from the file will be stored in this object.
sid_map	The sid_map object to use in the rpl_sidno generation of the Gtid_log_event. If lock is needed in the sid_map, the caller must hold it.
verify_checksum	Set to true to verify event checksums.
is_relay_log	Set to true, if filename is a Relay Log, false if it is a Binary Log.

Return values

GOT_GTIDS	The file was successfully read and it contains both Gtid_log_events and Previous_gtids_log_events. This is only possible if either all_gtids or first_gtid are not null.
GOT_PREVIOUS_GTIDS	The file was successfully read and it contains Previous_gtids_log_events but no Gtid_log_events. For binary logs, if no all_gtids and no first_gtid are specified, this function will be done right after reading the PREVIOUS_GTIDS regardless of the rest of the content of the binary log file.
NO_GTIDS	The file was successfully read and it does not contain GTID events.
ERROR	Out of memory, or IO error, or malformed event structure, or the file is malformed (e.g., contains Gtid_log_events but no Previous_gtids_log_event).
TRUNCATED	The file was truncated before the end of the first Previous_gtids_log_event.

reencrypt_logs()

bool MYSQL_BIN_LOG::reencrypt_logs

(

)

Re-encrypt previous existent binary/relay logs as below.

Starting from the next to last entry on the index file, iterating down to the first one:

• If the file is encrypted, re-encrypt it. Otherwise, skip it.
• If failed to open the file, report an error.

Return values

False	Success
True	Error

register_binlog_handler()

static void register_binlog_handler ( THD *  thd, bool  trx  )

static

register_create_index_entry()

int MYSQL_BIN_LOG::register_create_index_entry

(

const char *

entry

)

register_log_info()

void MYSQL_BIN_LOG::register_log_info

(

LOG_INFO *

log_info

)

Register LOG_INFO so that log_in_use and adjust_linfo_offsets can operate on all logs.

Note that register_log_info, unregister_log_info, log_in_use, adjust_linfo_offsets are is used on global mysql_bin_log object.

Parameters

log_info

pointer to LOG_INFO which is registred

register_purge_index_entry()

int MYSQL_BIN_LOG::register_purge_index_entry

(

const char *

entry

)

remove_logs_from_index()

int MYSQL_BIN_LOG::remove_logs_from_index	(	LOG_INFO *	log_info,
		bool	need_update_threads
	)

Remove logs from index file.

• To make it crash safe, we copy the content of the index file from index_file_start_offset recorded in log_info to a crash safe index file first and then move the crash safe index file to the index file.

Parameters

log_info	Store here the found log file name and position to the NEXT log file name in the index file.
need_update_threads	If we want to update the log coordinates of all threads. False for relay logs, true otherwise.

Return values

0	ok
LOG_INFO_IO	Got IO error while reading/writing file

report_binlog_write_error()

void MYSQL_BIN_LOG::report_binlog_write_error ( )

private

report_cache_write_error()

void MYSQL_BIN_LOG::report_cache_write_error	(	THD *	thd,
		bool	is_transactional
	)

report_missing_gtids()

void MYSQL_BIN_LOG::report_missing_gtids	(	const Gtid_set *	previous_gtid_set,
		const Gtid_set *	slave_executed_gtid_set,
		std::string &	errmsg
	)

Function to report the missing GTIDs.

This function logs the missing transactions on master to its error log as a warning. If the missing GTIDs are too long to print in a message, it suggests the steps to extract the missing transactions.

This function also informs slave about the GTID set sent by the slave, transactions missing on the master and few suggestions to recover from the error. This message shall be wrapped by ER_SOURCE_FATAL_ERROR_READING_BINLOG on slave and will be logged as an error.

This function will be called from find_first_log_not_in_gtid_set() function.

Parameters

previous_gtid_set	Previous GTID set found
slave_executed_gtid_set	GTID set executed by slave
errmsg	Pointer to the error message

report_missing_purged_gtids()

void MYSQL_BIN_LOG::report_missing_purged_gtids	(	const Gtid_set *	slave_executed_gtid_set,
		std::string &	errmsg
	)

Function to report the missing GTIDs.

This function logs the missing transactions on master to its error log as a warning. If the missing GTIDs are too long to print in a message, it suggests the steps to extract the missing transactions.

This function also informs slave about the GTID set sent by the slave, transactions missing on the master and few suggestions to recover from the error. This message shall be wrapped by ER_SOURCE_FATAL_ERROR_READING_BINLOG on slave and will be logged as an error.

This function will be called from mysql_binlog_send() function.

Parameters

slave_executed_gtid_set	GTID set executed by slave
errmsg	Pointer to the error message

reset_binlog_unsafe_suppression()

static void reset_binlog_unsafe_suppression ( )

static

Auxiliary function to reset the limit unsafety warning suppression.

reset_logs()

bool MYSQL_BIN_LOG::reset_logs	(	THD *	thd,
		bool	delete_only = false
	)

Removes files, as part of a RESET MASTER or RESET SLAVE statement, by deleting all logs referred to in the index file and the index file.

Then, it creates a new index file and a new log file.

The new index file will only contain the new log file.

Parameters

thd	Thread
delete_only	If true, do not create a new index file and a new log file.

Note

If not called from slave thread, write start event to new log

Return values

0	ok
1	error

rollback()

int MYSQL_BIN_LOG::rollback ( THD *  thd, bool  all  )

overridevirtual

Write a rollback record of the transaction to the binary log.

For binary log group commit, the rollback is separated into three parts:

1. First part consists of filling the necessary caches and finalizing them (if they need to be finalized). After a cache is finalized, nothing can be added to the cache.

2. Second part execute an ordered flush and commit. This will be done using the group commit functionality in ordered_commit.

   Since we roll back the transaction early, we call ordered_commit with the skip_commit flag set. The ha_commit_low call inside ordered_commit will then not be called.

3. Third part checks any errors resulting from the flush and handles them appropriately.

See also

MYSQL_BIN_LOG::ordered_commit

ha_commit_low

ha_rollback_low

Parameters

thd	Session to commit
all	This is true if this is a real transaction rollback, and false otherwise.

Returns

Error code, or zero if there were no error.

Implements TC_LOG.

rotate()

int MYSQL_BIN_LOG::rotate	(	bool	force_rotate,
		bool *	check_purge
	)

The method executes rotation when LOCK_log is already acquired by the caller.

Parameters

force_rotate	caller can request the log rotation
check_purge	is set to true if rotation took place

Note

If rotation fails, for instance the server was unable to create a new log file, we still try to write an incident event to the current log.

The caller must hold LOCK_log when invoking this function.

Return values

nonzero

- error in rotating routine.

rotate_and_purge()

int MYSQL_BIN_LOG::rotate_and_purge	(	THD *	thd,
		bool	force_rotate
	)

Execute a FLUSH LOGS statement.

The method is a shortcut of rotate() and purge(). LOCK_log is acquired prior to rotate and is released after it.

Parameters

thd	Current session.
force_rotate	caller can request the log rotation

Return values

nonzero

- error in rotating routine.

set_crash_safe_index_file_name()

int MYSQL_BIN_LOG::set_crash_safe_index_file_name

(

const char *

base_file_name

)

Set the name of crash safe index file.

Return values

0	ok
1	error

set_incident()

void binlog_cache_data::set_incident

(

std::string_view

incident_message = "Non-transactional changes were not written to the binlog."

)

See also

handle_deferred_cache_write_incident

set_max_size()

void MYSQL_BIN_LOG::set_max_size

(

ulong

max_size_arg

)

set_purge_index_file_name()

int MYSQL_BIN_LOG::set_purge_index_file_name

(

const char *

base_file_name

)

show_binlog_events()

template<class BINLOG_FILE_READER >

bool show_binlog_events	(	THD *	thd,
		MYSQL_BIN_LOG *	binary_log
	)

show_query_type()

static const char * show_query_type ( THD::enum_binlog_query_type  qtype )

static

signal_update()

void MYSQL_BIN_LOG::signal_update ( )

protected

Notifies waiting threads that binary log has been updated.

start_union_events()

void MYSQL_BIN_LOG::start_union_events	(	THD *	thd,
		query_id_t	query_id_param
	)

stmt_cannot_safely_rollback()

bool stmt_cannot_safely_rollback

(

const THD *

thd

)

This function checks if current statement cannot be rollded back safely.

Parameters

thd	The client thread that executed the current statement.

Returns

true if cannot be safely rolled back, false otherwise.

stmt_has_updated_trans_table()

bool stmt_has_updated_trans_table

(

Ha_trx_info_list const &

ha_list

)

This function checks if a transactional table was updated by the current statement.

Parameters

ha_list

Registered storage engine handler list.

Returns

true if a transactional table was updated, false otherwise.

stop_union_events()

void MYSQL_BIN_LOG::stop_union_events

(

THD *

thd

)

sync_binlog_file()

std::pair< bool, bool > MYSQL_BIN_LOG::sync_binlog_file ( bool  force )

private

Call fsync() to sync the file to disk.

sync_purge_index_file()

int MYSQL_BIN_LOG::sync_purge_index_file

(

)

thd_get_cache_mngr()

static binlog_cache_mngr * thd_get_cache_mngr ( const THD *  thd )

static

trans_cannot_safely_rollback()

bool trans_cannot_safely_rollback

(

const THD *

thd

)

This function checks if a transaction cannot be rolled back safely.

Parameters

thd	The client thread that executed the current statement.

Returns

true if cannot be safely rolled back, false otherwise.

trans_has_updated_trans_table()

bool trans_has_updated_trans_table

(

const THD *

thd

)

This function checks if a transactional table was updated by the current transaction.

Parameters

thd	The client thread that executed the current statement.

Returns

true if a transactional table was updated, false otherwise.

truncate()

void binlog_trx_cache_data::truncate	(	THD *	thd,
		bool	all
	)

This function truncates the transactional cache upon committing or rolling back either a transaction or a statement.

Parameters

thd	The thread whose transaction should be flushed
all	true means truncate the transaction, otherwise the statement must be truncated.

truncate_relaylog_file()

bool MYSQL_BIN_LOG::truncate_relaylog_file	(	Master_info *	mi,
		my_off_t	truncate_pos
	)

Truncate the active relay log file in the specified position.

Parameters

mi	Master_info of the channel going to truncate the relay log file.
truncate_pos	The position to truncate the active relay log file.

Returns

False on success and true on failure.

truncate_update_log_file()

bool MYSQL_BIN_LOG::truncate_update_log_file ( const char *  log_name, my_off_t  valid_pos, my_off_t  binlog_size, bool  update  )

private

Truncte log file and clear LOG_EVENT_BINLOG_IN_USE_F when update is set.

Parameters

[in]	log_name	name of the log file to be trunacted
[in]	valid_pos	position at which to truncate the log file
[in]	binlog_size	length of the log file before truncated
[in]	update	should the LOG_EVENT_BINLOG_IN_USE_F flag be cleared true - set LOG_EVENT_BINLOG_IN_USE_F to 0 false - do not modify LOG_EVENT_BINLOG_IN_USE_F flag

Returns

true - sucess, false - failed

unregister_log_info()

void MYSQL_BIN_LOG::unregister_log_info

(

LOG_INFO *

log_info

)

Unregister LOG_INFO when it is no longer needed.

Parameters

log_info

pointer to LOG_INFO which is registred

update_binlog_end_pos() [1/2]

void MYSQL_BIN_LOG::update_binlog_end_pos

(

bool

need_lock = true

)

update_binlog_end_pos() [2/2]

void MYSQL_BIN_LOG::update_binlog_end_pos ( const char *  file, my_off_t  pos  )

inline

update_thd_next_event_pos()

void MYSQL_BIN_LOG::update_thd_next_event_pos

(

THD *

thd

)

wait_for_update() [1/2]

int MYSQL_BIN_LOG::wait_for_update

(

)

Wait until we get a signal that the binary log has been updated.

Return values

0

success

Note

LOCK_binlog_end_pos must be owned before calling this function, may be temporarily released while the thread is waiting and is reacquired before returning from the function

wait_for_update() [2/2]

int MYSQL_BIN_LOG::wait_for_update

(

const std::chrono::nanoseconds &

timeout

)

Wait until we get a signal that the binary log has been updated.

NOTES

Parameters

[in]

timeout

a pointer to a timespec; NULL means to wait w/o timeout.

Return values

0	if got signalled on update
non-0	if wait timeout elapsed

Note

LOCK_binlog_end_pos must be owned before calling this function, may be temporarily released while the thread is waiting and is reacquired before returning from the function

write_buffer()

bool MYSQL_BIN_LOG::write_buffer	(	const char *	buf,
		uint	len,
		Master_info *	mi
	)

write_cache()

bool MYSQL_BIN_LOG::write_cache	(	THD *	thd,
		class binlog_cache_data *	cache_data,
		class Binlog_event_writer *	writer
	)

Write the contents of the statement or transaction cache to the binary log.

Comparison with do_write_cache:

• do_write_cache is a lower-level function that only performs the actual write.
• write_cache is a higher-level function that calls do_write_cache and additionally performs some maintenance tasks, including:
  • report any errors that occurred
  • update gtid_state
  • update thd.binlog_next_event_pos

Parameters

thd	Thread variable
cache_data	Events will be read from the IO_CACHE of this cache_data object.
writer	Events will be written to this Binlog_event_writer.

Return values

true	IO error.
false	Success.

Note

We only come here if there is something in the cache.

Whatever is in the cache is always a complete transaction.

'cache' needs to be reinitialized after this functions returns.

write_event() [1/3]

bool MYSQL_BIN_LOG::write_event	(	Log_event *	ev,
		Master_info *	mi
	)

write_event() [2/3]

int binlog_cache_data::write_event

(

Log_event *

event

)

write_event() [3/3]

bool MYSQL_BIN_LOG::write_event

(

Log_event *

event_info

)

Write an event to the binary log cache.

write_event_to_binlog()

bool MYSQL_BIN_LOG::write_event_to_binlog ( Log_event *  ev )

inline

write_event_to_binlog_and_sync()

bool MYSQL_BIN_LOG::write_event_to_binlog_and_sync

(

Log_event *

ev

)

write_incident_commit()

bool MYSQL_BIN_LOG::write_incident_commit	(	THD *	thd,
		std::string_view	incident_message
	)

Write an incident and call commit.

The incident is written by marking the transaction cache as having an incident and then commit it to binlog. During commit, the flush stage will write and Incident_log_event and preceding Gtid_log_event to give the incident a proper GTID. The incident will also cause the binlog to be rotated and check if some purge is applicable.

Parameters

[in]	thd	the THD object of current thread.
[in]	incident_message	A message describing the incident.

Returns

Returns false if succeeds, otherwise true is returned.

write_stmt_directly()

bool MYSQL_BIN_LOG::write_stmt_directly	(	THD *	thd,
		const char *	stmt,
		size_t	stmt_len,
		enum enum_sql_command	sql_command
	)

Write a dml into statement cache and then flush it into binlog.

It writes Gtid_log_event and BEGIN, COMMIT automatically.

It is aimed to handle cases of "background" logging where a statement is logged indirectly, like "TRUNCATE TABLE a_memory_table". So don't use it on any normal statement.

Parameters

[in]	thd	the THD object of current thread.
[in]	stmt	the DML statement.
[in]	stmt_len	the length of the DML statement.
[in]	sql_command	the type of SQL command.

Returns

Returns false if succeeds, otherwise true is returned.

write_transaction()

bool MYSQL_BIN_LOG::write_transaction	(	THD *	thd,
		binlog_cache_data *	cache_data,
		Binlog_event_writer *	writer,
		bool	parallelization_barrier
	)

Write the Gtid_log_event to the binary log (prior to writing the statement or transaction cache).

Parameters

thd	Thread that is committing.
cache_data	The cache that is flushing.
writer	The event will be written to this Binlog_event_writer object.
parallelization_barrier	The transaction is a parallelization_barrier and the dependency tracker should mark subsequent transactions to depend on it.

Return values

false	Success.
true	Error.

write_xa_to_cache()

int MYSQL_BIN_LOG::write_xa_to_cache

(

THD *

thd

)

Logging XA commit/rollback of a prepared transaction.

It fills in the appropriate event in the statement cache whenever xid state is marked with is_binlogged() flag that indicates the prepared part of the transaction must've been logged.

About early returns from the function:

• ONE_PHASE option to XA-COMMIT is handled to skip writing XA-commit event now.
• check is for the read-only XA that is not to be logged.

Parameters

thd	THD handle

Returns

error code, 0 success

Variable Documentation

binlog_hton

handlerton* binlog_hton

static

binlog_storage_engine

struct st_mysql_storage_engine binlog_storage_engine

Initial value:

= {
    MYSQL_HANDLERTON_INTERFACE_VERSION}

g_stage_name

const char* g_stage_name[]

static

Initial value:

= {"FLUSH", "SYNC", "COMMIT", "AFTER_COMMIT",
                                     "COMMIT_ORDER_FLUSH"}

Names for the stages.

limit_unsafe_suppression_start_time

ulonglong limit_unsafe_suppression_start_time = 0

static

limit_unsafe_warning_count

int limit_unsafe_warning_count = 0

static

log_bin_basename

const char* log_bin_basename = nullptr

log_bin_index

const char* log_bin_index = nullptr

opt_binlog_order_commits

bool opt_binlog_order_commits = true

rpl_read_size

ulong rpl_read_size

sync_binlog_period

MYSQL_BIN_LOG mysql_bin_log& sync_binlog_period

unsafe_warning_suppression_is_activated

bool unsafe_warning_suppression_is_activated = false

static