136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/* Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License, version 2.0,
|
|
as published by the Free Software Foundation.
|
|
|
|
This program is also distributed with certain software (including
|
|
but not limited to OpenSSL) that is licensed under separate terms,
|
|
as designated in a particular file or component or in included license
|
|
documentation. The authors of MySQL hereby grant you an additional
|
|
permission to link the program and your derivative works with the
|
|
separately licensed software that they have included with MySQL.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License, version 2.0, for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
|
|
|
|
#ifndef SEMISYNC_MASTER_ACK_RECEIVER_DEFINED
|
|
#define SEMISYNC_MASTER_ACK_RECEIVER_DEFINED
|
|
|
|
#include <sys/types.h>
|
|
#include <vector>
|
|
|
|
#include "my_inttypes.h"
|
|
#include "my_io.h"
|
|
#include "my_thread.h"
|
|
#include "plugin/semisync/semisync.h"
|
|
#include "plugin/semisync/semisync_master.h"
|
|
#include "sql/sql_class.h"
|
|
|
|
struct Slave {
|
|
uint32_t thread_id;
|
|
Vio *vio;
|
|
uint server_id;
|
|
mysql_compress_context compress_ctx;
|
|
bool is_leaving;
|
|
|
|
my_socket sock_fd() const { return vio->mysql_socket.fd; }
|
|
};
|
|
|
|
typedef std::vector<Slave> Slave_vector;
|
|
typedef Slave_vector::iterator Slave_vector_it;
|
|
|
|
/**
|
|
Ack_receiver is responsible to control ack receive thread and maintain
|
|
slave information used by ack receive thread.
|
|
|
|
There are mainly four operations on ack receive thread:
|
|
start: start ack receive thread
|
|
stop: stop ack receive thread
|
|
add_slave: maintain a new semisync slave's information
|
|
remove_slave: remove a semisync slave's information
|
|
*/
|
|
class Ack_receiver : public ReplSemiSyncBase {
|
|
public:
|
|
Ack_receiver();
|
|
~Ack_receiver();
|
|
|
|
/**
|
|
Notify ack receiver to receive acks on the dump session.
|
|
|
|
It adds the given dump thread into the slave list and wakes
|
|
up ack thread if it is waiting for any slave coming.
|
|
|
|
@param[in] thd THD of a dump thread.
|
|
|
|
@return it return false if succeeds, otherwise true is returned.
|
|
*/
|
|
bool add_slave(THD *thd);
|
|
|
|
/**
|
|
Notify ack receiver not to receive ack on the dump session.
|
|
|
|
it removes the given dump thread from slave list.
|
|
|
|
@param[in] thd THD of a dump thread.
|
|
*/
|
|
void remove_slave(THD *thd);
|
|
|
|
/**
|
|
Start ack receive thread
|
|
|
|
@return it return false if succeeds, otherwise true is returned.
|
|
*/
|
|
bool start();
|
|
|
|
/**
|
|
Stop ack receive thread
|
|
*/
|
|
void stop();
|
|
|
|
/**
|
|
The core of ack receive thread.
|
|
|
|
It monitors all slaves' sockets and receives acks when they come.
|
|
*/
|
|
void run();
|
|
|
|
void setTraceLevel(unsigned long trace_level) { trace_level_ = trace_level; }
|
|
|
|
bool init() {
|
|
setTraceLevel(rpl_semi_sync_master_trace_level);
|
|
if (rpl_semi_sync_master_enabled) return start();
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
enum status { ST_UP, ST_DOWN, ST_STOPPING };
|
|
uint8 m_status;
|
|
/*
|
|
Protect m_status, m_slaves_changed and m_slaves. ack thread and other
|
|
session may access the variables at the same time.
|
|
*/
|
|
mysql_mutex_t m_mutex;
|
|
mysql_cond_t m_cond;
|
|
/* If slave list is updated(add or remove). */
|
|
bool m_slaves_changed;
|
|
Slave_vector m_slaves;
|
|
my_thread_handle m_pid;
|
|
|
|
/* Declare them private, so no one can copy the object. */
|
|
Ack_receiver(const Ack_receiver &ack_receiver);
|
|
Ack_receiver &operator=(const Ack_receiver &ack_receiver);
|
|
|
|
void set_stage_info(const PSI_stage_info &stage);
|
|
void wait_for_slave_connection();
|
|
};
|
|
|
|
extern Ack_receiver *ack_receiver;
|
|
#endif
|