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2025-09-24 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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Semi-synchronous replication requires the use of plug-ins, and both master and slave nodes need to install plug-ins. After the plug-in is installed, configure the system variable to enable and turn off semi-synchronous replication.
1. Semi-synchronous implementation premise
Database version 5.5 or above
Have_dynamic_loading system variable is YES.
Replication is already working properly.
two。 Install the plug-in
Master node INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master.so'; slave node INSTALL PLUGIN rpl_semi_sync_slave SONAME' semisync_slave.so'
3. Check to see if the installation is successful
Show plugins; shows that the installation is successful | rpl_semi_sync_master | ACTIVE | REPLICATION | semisync_master.so | GPL | | rpl_semi_sync_slave | ACTIVE | REPLICATION | semisync_slave.so | GPL | mysql > show variables like'% semi%' +-+-+ | Variable_name | Value | +-- -+-+ | rpl_semi_sync_master_enabled | OFF | | rpl_semi_sync_master_timeout | 10000 | | rpl_semi_sync_master_trace_level | 32 | rpl_semi_sync_master_wait_no_slave | ON | | rpl_semi_sync_slave_enabled | OFF | | rpl_semi_sync_slave_trace_level | | 32 | +-+-+ 6 rows in set (0.00 sec) |
4. Enable semi-synchronization
The master node enables semi-synchronization, and the timeout is 10s.
SET GLOBAL rpl_semi_sync_master_enabled = 1 * set GLOBAL rpl_semi_sync_master_timeout = 10000; enable semi-synchronization from the slave node, restart the replication thread effective SET GLOBAL rpl_semi_sync_slave_enabled = 1 * * stop SLAVE IO_THREAD;START SLAVE IO_THREAD
5. Confirm that semi-synchronization is effective
Show global status like 'rpl%'
6. Persistence parameter
On the master: [mysqld] rpl_semi_sync_master_enabled=1rpl_semi_sync_master_timeout=1000 # 1 secondOn each slave: [mysqld] rpl_semi_sync_slave_enabled=1
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