rpl_source.cc File Reference

#include "sql/rpl_source.h"
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <memory>
#include <unordered_map>
#include <utility>
#include "m_ctype.h"
#include "m_string.h"
#include "map_helpers.h"
#include "mutex_lock.h"
#include "my_byteorder.h"
#include "my_command.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_psi_config.h"
#include "my_sys.h"
#include "mysql/components/services/bits/mysql_mutex_bits.h"
#include "mysql/components/services/bits/psi_bits.h"
#include "mysql/components/services/bits/psi_mutex_bits.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/psi/mysql_file.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/service_mysql_alloc.h"
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/binlog.h"
#include "sql/current_thd.h"
#include "sql/debug_sync.h"
#include "sql/item.h"
#include "sql/item_func.h"
#include "sql/log.h"
#include "sql/mysqld.h"
#include "sql/mysqld_thd_manager.h"
#include "sql/protocol.h"
#include "sql/protocol_classic.h"
#include "sql/psi_memory_key.h"
#include "sql/rpl_binlog_sender.h"
#include "sql/rpl_filter.h"
#include "sql/rpl_group_replication.h"
#include "sql/rpl_gtid.h"
#include "sql/rpl_handler.h"
#include "sql/rpl_utility.h"
#include "sql/sql_class.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/system_variables.h"
#include "sql_string.h"
#include "thr_mutex.h"
#include "typelib.h"

Classes
class	Find_zombie_dump_thread
	Callback function used by kill_zombie_dump_threads() function to to find zombie dump thread from the thd list. More...

Macros
#define	get_object(p, obj, msg)
#define	CHECK_PACKET_SIZE(BYTES)
	If there are less than BYTES bytes left to read in the packet, report error. More...
#define	READ(DECODE, BYTES)
	Auxiliary macro used to define READ_INT and READ_STRING. More...
#define	READ_INT(VAR, BYTES)    READ(VAR = uint##BYTES##korr(packet_position), BYTES)
	Check that there are at least BYTES more bytes to read, then read the bytes and decode them into the given integer VAR, then advance the reading position. More...
#define	READ_STRING(VAR, BYTES, BUFFER_SIZE)
	Check that there are at least BYTES more bytes to read and that BYTES+1 is not greater than BUFFER_SIZE, then read the bytes into the given variable VAR, then advance the reading position. More...

Functions
resource_blocker::Resource &	get_dump_thread_resource ()
static bool	check_and_report_dump_thread_blocked (resource_blocker::User &rpl_user)
int	register_replica (THD *thd, uchar *packet, size_t packet_length)
	Register slave in 'slave_list' hash table. More...
void	unregister_replica (THD *thd, bool only_mine, bool need_lock_slave_list)
bool	show_replicas (THD *thd)
	Execute a SHOW REPLICAS / SHOW SLAVE HOSTS statement. More...
bool	com_binlog_dump (THD *thd, char *packet, size_t packet_length)
	Process a COM_BINLOG_DUMP packet. More...
bool	com_binlog_dump_gtid (THD *thd, char *packet, size_t packet_length)
	Process a COM_BINLOG_DUMP_GTID packet. More...
void	mysql_binlog_send (THD *thd, char *log_ident, my_off_t pos, Gtid_set *slave_gtid_executed, uint32 flags)
	Low-level function where the dump thread iterates over the binary log and sends events to the slave. More...
const user_var_entry *	get_user_var_from_alternatives (const THD *thd, const std::string alt1, const std::string alt2)
	Read a user variable that may exist under two different names. More...
String *	get_replica_uuid (THD *thd, String *value)
	An auxiliary function extracts slave UUID. More...
void	kill_zombie_dump_threads (THD *thd)
bool	reset_master (THD *thd, bool unlock_global_read_lock)
	Execute a RESET MASTER statement. More...
bool	show_master_status (THD *thd)
	Execute a SHOW MASTER STATUS statement. More...
bool	show_binlogs (THD *thd)
	Execute a SHOW BINARY LOGS statement. More...

Variables
int	max_binlog_dump_events = 0
bool	opt_sporadic_binlog_dump_fail = false
malloc_unordered_map< uint32, unique_ptr_my_free< REPLICA_INFO > >	slave_list
TYPELIB	binlog_checksum_typelib

Macro Definition Documentation

CHECK_PACKET_SIZE

#define CHECK_PACKET_SIZE

(

BYTES

)

Value:

  do {                                                          \
    if (packet_bytes_todo < BYTES) goto error_malformed_packet; \
  } while (0)

If there are less than BYTES bytes left to read in the packet, report error.

get_object

#define get_object	(		p,
			obj,
			msg
	)

Value:

  {                                              \
    uint len;                                    \
    if (p >= p_end) {                            \
      my_error(ER_MALFORMED_PACKET, MYF(0));     \
      return 1;                                  \
    }                                            \
    len = net_field_length_ll(&p);               \
    if (p + len > p_end || len >= sizeof(obj)) { \
      errmsg = msg;                              \
      goto err;                                  \
    }                                            \
    strmake(obj, (char *)p, len);                \
    p += len;                                    \
  }

READ

#define READ	(		DECODE,
			BYTES
	)

Value:

  do {                          \
    CHECK_PACKET_SIZE(BYTES);   \
    DECODE;                     \
    packet_position += BYTES;   \
    packet_bytes_todo -= BYTES; \
  } while (0)

Auxiliary macro used to define READ_INT and READ_STRING.

Check that there are at least BYTES more bytes to read, then read the bytes using the given DECODER, then advance the reading position.

READ_INT

#define READ_INT	(		VAR,
			BYTES
	)		READ(VAR = uint##BYTES##korr(packet_position), BYTES)

Check that there are at least BYTES more bytes to read, then read the bytes and decode them into the given integer VAR, then advance the reading position.

READ_STRING

#define READ_STRING	(		VAR,
			BYTES,
			BUFFER_SIZE
	)

Value:

  do {                                                     \
    if (BUFFER_SIZE <= BYTES) goto error_malformed_packet; \
    READ(memcpy(VAR, packet_position, BYTES), BYTES);      \
    VAR[BYTES] = '\0';                                     \
  } while (0)

Check that there are at least BYTES more bytes to read and that BYTES+1 is not greater than BUFFER_SIZE, then read the bytes into the given variable VAR, then advance the reading position.

Function Documentation

check_and_report_dump_thread_blocked()

static bool check_and_report_dump_thread_blocked ( resource_blocker::User &  rpl_user )

static

com_binlog_dump()

bool com_binlog_dump	(	THD *	thd,
		char *	packet,
		size_t	packet_length
	)

Process a COM_BINLOG_DUMP packet.

This function parses the packet and then calls mysql_binlog_send.

Parameters

thd	The dump thread.
packet	The COM_BINLOG_DUMP packet.
packet_length	The length of the packet in bytes.

Return values

true	Error
false	Success

com_binlog_dump_gtid()

bool com_binlog_dump_gtid	(	THD *	thd,
		char *	packet,
		size_t	packet_length
	)

Process a COM_BINLOG_DUMP_GTID packet.

This function parses the packet and then calls mysql_binlog_send.

Parameters

thd	The dump thread.
packet	The COM_BINLOG_DUMP_GTID packet.
packet_length	The length of the packet in bytes.

Return values

true	Error
false	Success

get_dump_thread_resource()

resource_blocker::Resource & get_dump_thread_resource

(

)

get_replica_uuid()

String * get_replica_uuid	(	THD *	thd,
		String *	value
	)

An auxiliary function extracts slave UUID.

Parameters

[in]	thd	THD to access a user variable
[out]	value	String to return UUID value.

Returns

if success value is returned else NULL is returned.

get_user_var_from_alternatives()

const user_var_entry * get_user_var_from_alternatives	(	const THD *	thd,
		const std::string	alt1,
		const std::string	alt2
	)

Read a user variable that may exist under two different names.

Parameters

thd	The session to read from.
alt1	The first variable name alternative.
alt2	The second variable name alternative.

Return values

If	there exists a user variable in the current session with the first name, return that. Otherwise, if the second one exists, return that. Otherwise, return NULL.

kill_zombie_dump_threads()

void kill_zombie_dump_threads

(

THD *

thd

)

mysql_binlog_send()

void mysql_binlog_send	(	THD *	thd,
		char *	log_ident,
		my_off_t	pos,
		Gtid_set *	gtid_set,
		uint32	flags
	)

Low-level function where the dump thread iterates over the binary log and sends events to the slave.

This function is common for both COM_BINLOG_DUMP and COM_BINLOG_DUMP_GTID.

Parameters

thd	The dump thread.
log_ident	The filename of the binary log, as given in the COM_BINLOG_DUMP[_GTID] packet. If this is is an empty string (first character is '\0'), we start with the oldest binary log.
pos	The offset in the binary log, as given in the COM_BINLOG_DUMP[_GTID] packet. This must be at least 4 and at most the size of the binary log file.
gtid_set	The gtid_set that the slave sent, or NULL if the protocol is COM_BINLOG_DUMP.
flags	flags in COM_BINLOG_DUMP[_GTID] packets.

Note

This function will start reading at the given (filename, offset), or from the oldest log if filename[0]==0. It will send all events from that position; but if gtid_set!=NULL, it will skip all events in that set.

register_replica()

int register_replica	(	THD *	thd,
		uchar *	packet,
		size_t	packet_length
	)

Register slave in 'slave_list' hash table.

Returns

0 ok

1 Error. Error message sent to client

reset_master()

bool reset_master	(	THD *	thd,
		bool	unlock_global_read_lock
	)

Execute a RESET MASTER statement.

Parameters

thd	Pointer to THD object of the client thread executing the statement.
unlock_global_read_lock	Unlock the global read lock acquired by RESET MASTER.

Return values

false	success
true	error

show_binlogs()

bool show_binlogs

(

THD *

thd

)

Execute a SHOW BINARY LOGS statement.

Parameters

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

Return values

false	success
true	failure

show_master_status()

bool show_master_status

(

THD *

thd

)

Execute a SHOW MASTER STATUS statement.

Parameters

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

Return values

false	success
true	failure

show_replicas()

bool show_replicas

(

THD *

thd

)

Execute a SHOW REPLICAS / SHOW SLAVE HOSTS statement.

Parameters

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

Return values

false	success
true	failure

unregister_replica()

void unregister_replica	(	THD *	thd,
		bool	only_mine,
		bool	need_lock_slave_list
	)

Variable Documentation

max_binlog_dump_events

int max_binlog_dump_events = 0

opt_sporadic_binlog_dump_fail

bool opt_sporadic_binlog_dump_fail = false

slave_list

malloc_unordered_map<uint32, unique_ptr_my_free<REPLICA_INFO> > slave_list

Initial value:

{
    key_memory_REPLICA_INFO}