gr::Gtid_generator Class Reference

This class is responsible for generating GTIDs in the Certifier. More...

#include <gtid_generator.h>

Public Member Functions
std::pair< rpl_gno, mysql::utils::Return_status >	get_next_available_gtid (const char *member_uuid, rpl_sidno sidno, const Gtid_set &gtid_set)
	This method is used to get the next valid GNO for the given sidno, for the transaction originating from the group member identified by the 'member_uuid'. More...
void	recompute (const Gtid_set &gtid_set)
	This function recomputes generator state. More...
void	initialize (uint64 gtid_assignment_block_size)
	This is initialization function that will be called in the certifier. More...
auto	get_gtid_assignment_block_size () const
	Accesses gtid assignment block size the Gtid_generator was initialized with. More...

Private Attributes
std::unordered_map< rpl_sidno, Gtid_generator_for_sidno >	m_gtid_generator_for_sidno
	GTID bookkeeping for each sidno. More...
uint64	m_gtid_assignment_block_size = 1
	The group GTID assignment block size. More...

Detailed Description

This class is responsible for generating GTIDs in the Certifier.

Gtid certifier uses one instance of this class for generation of GTIDs. Gtid generator keeps track of free GTIDs for specific sidnos for each GR member. To achieve that, it consults gtid_set provided. When gtid generation is requested, GTID generator will reserve for each member a block of free GTIDS of size provided during the initialization (gtid_assignment_block_size). Recalculation of GTID blocks may be requested by the call to the "reset" function. New GTID may be generated by the call to the "get_next_available_gtid" function. Access to Gtid_generator must be synchronized by the user.

Member Function Documentation

get_gtid_assignment_block_size()

auto gr::Gtid_generator::get_gtid_assignment_block_size ( ) const

inline

Accesses gtid assignment block size the Gtid_generator was initialized with.

Returns

Gtid assignment block size

get_next_available_gtid()

std::pair< rpl_gno, mysql::utils::Return_status > gr::Gtid_generator::get_next_available_gtid	(	const char *	member_uuid,
		rpl_sidno	sidno,
		const Gtid_set &	gtid_set
	)

This method is used to get the next valid GNO for the given sidno, for the transaction originating from the group member identified by the 'member_uuid'.

This method may consult gtid_set for the list of available GTIDs

Parameters

member_uuid	The UUID of the member from which this transaction originates. It will be NULL on View_change_log_event.
sidno	The sidno that will be used on GTID
gtid_set	Gtid set under consideration

Returns

A pair of:

• Generated gno and OK in case gno generation was possible
• invalid gno and ERROR: (-1) when there are no available gnos for this SIDNO (-2) when assigned GTIDs block is exhausted

initialize()

void gr::Gtid_generator::initialize

(

uint64

gtid_assignment_block_size

)

This is initialization function that will be called in the certifier.

Parameters

gtid_assignment_block_size

This is the size of gtid assignment block

recompute()

void gr::Gtid_generator::recompute

(

const Gtid_set &

gtid_set

)

This function recomputes generator state.

Parameters

gtid_set

Gtid set under consideration

Member Data Documentation

m_gtid_assignment_block_size

uint64 gr::Gtid_generator::m_gtid_assignment_block_size = 1

private

The group GTID assignment block size.

m_gtid_generator_for_sidno

std::unordered_map<rpl_sidno, Gtid_generator_for_sidno> gr::Gtid_generator::m_gtid_generator_for_sidno

private

GTID bookkeeping for each sidno.

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

• plugin/group_replication/include/certification/gtid_generator.h
• plugin/group_replication/src/certification/gtid_generator.cc