include/master-slave.inc
[connection master]
set @restore_slave_net_timeout= @@global.slave_net_timeout;
set @@global.slave_net_timeout= 10;
SHOW STATUS LIKE "Slave_last_heartbeat";
Variable_name	Slave_last_heartbeat
Value	
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root';
Warnings:
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	5.000
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 4294968;
ERROR HY000: The requested value for the heartbeat period is either negative or exceeds the maximum allowed (4294967 seconds).
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	5.000
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 0.0009999;
Warnings:
Warning	####	The requested value for the heartbeat period is less than 1 millisecond. The value is reset to 0, meaning that heartbeating will effectively be disabled.
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	0.000
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 4294967;
Warnings:
Warning	####	The requested value for the heartbeat period exceeds the value of `slave_net_timeout' seconds. A sensible value for the period should be less than the timeout.
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	4294967.000
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 0.001;
Warnings:
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	0.001
reset slave;
set @@global.slave_net_timeout= 5;
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 5.001;
Warnings:
Warning	####	The requested value for the heartbeat period exceeds the value of `slave_net_timeout' seconds. A sensible value for the period should be less than the timeout.
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	5.001
reset slave;
set @@global.slave_net_timeout= 5;
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 4;
Warnings:
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	4.000
set @@global.slave_net_timeout= 3 /* must be a warning */;
Warnings:
Warning	1704	The requested value for the heartbeat period exceeds the value of `slave_net_timeout' seconds. A sensible value for the period should be less than the timeout.
reset slave;
drop table if exists t1;
set @@global.slave_net_timeout= 10;
change master to master_host='127.0.0.1',master_port=MASTER_PORT, master_user='root', master_heartbeat_period= 0.5;
Warnings:
Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
Note	####	Storing MySQL user name or password information in the master info repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START SLAVE; see the 'START SLAVE Syntax' in the MySQL Manual for more information.
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	0.500
start slave;
create table t1 (f1 int);
include/sync_slave_sql_with_master.inc
include/check_slave_param.inc [Relay_Log_File]
show status like 'Slave_heartbeat_period';;
Variable_name	Slave_heartbeat_period
Value	0.500
A heartbeat has been received by the slave
include/assert.inc [Slave_last_heartbeat should not be empty]
drop table t1;
include/sync_slave_sql_with_master.inc
set @@global.slave_net_timeout= @restore_slave_net_timeout;
include/rpl_end.inc
