Install semi-synchronous replication in MySQL5.5 Configuration

Check whether have_dynamic_loading is enabled on the master and slave.

Master

MASTER@root@(none) 10:54:58>show variables like 'have_dynamic_loading';+----------------------+-------+| Variable_name        | Value |+----------------------+-------+| have_dynamic_loading | YES   |+----------------------+-------+

Slave

SLAVE@root@test 10:47:52>show variables like 'have_dynamic_loading';+----------------------+-------+| Variable_name        | Value |+----------------------+-------+| have_dynamic_loading | YES   |+----------------------+-------+

Use root to install the semi-sync plug-in on the master

MASTER@root@(none) 10:58:14>MASTER@root@(none) 10:58:14>install plugin rpl_semi_sync_master soname 'semisync_master.so';Query OK, 0 rows affected (0.01 sec)MASTER@root@(none) 10:58:22>show plugins;+--------------------------+--------+--------------------+--------------------+---------+| Name                     | Status | Type               | Library            | License |+--------------------------+--------+--------------------+--------------------+---------+| binlog                   | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || mysql_native_password    | ACTIVE | AUTHENTICATION     | NULL               | GPL     || mysql_old_password       | ACTIVE | AUTHENTICATION     | NULL               | GPL     || MRG_MYISAM               | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || CSV                      | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || MEMORY                   | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || MyISAM                   | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || InnoDB                   | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || INNODB_TRX               | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_LOCKS             | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_LOCK_WAITS        | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_CMP               | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_CMP_RESET         | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_CMPMEM            | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_CMPMEM_RESET      | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_BUFFER_PAGE       | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_BUFFER_PAGE_LRU   | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL               | GPL     || BLACKHOLE                | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || ARCHIVE                  | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || FEDERATED                | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || PERFORMANCE_SCHEMA       | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || partition                | ACTIVE | STORAGE ENGINE     | NULL               | GPL     || rpl_semi_sync_master     | ACTIVE | REPLICATION        | semisync_master.so | GPL     |+--------------------------+--------+--------------------+--------------------+---------+

Use root to install the semi-sync plug-in on slave

SLAVE@root@test 10:55:18>install plugin rpl_semi_sync_slave soname 'semisync_slave.so';Query OK, 0 rows affected (0.01 sec)SLAVE@root@test 10:59:45>show plugins;+--------------------------+--------+--------------------+-------------------+---------+| Name                     | Status | Type               | Library           | License |+--------------------------+--------+--------------------+-------------------+---------+| binlog                   | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || mysql_native_password    | ACTIVE | AUTHENTICATION     | NULL              | GPL     || mysql_old_password       | ACTIVE | AUTHENTICATION     | NULL              | GPL     || MRG_MYISAM               | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || CSV                      | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || MEMORY                   | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || MyISAM                   | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || InnoDB                   | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || INNODB_TRX               | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_LOCKS             | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_LOCK_WAITS        | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_CMP               | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_CMP_RESET         | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_CMPMEM            | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_CMPMEM_RESET      | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_BUFFER_PAGE       | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_BUFFER_PAGE_LRU   | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || INNODB_BUFFER_POOL_STATS | ACTIVE | INFORMATION SCHEMA | NULL              | GPL     || BLACKHOLE                | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || ARCHIVE                  | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || FEDERATED                | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || PERFORMANCE_SCHEMA       | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || partition                | ACTIVE | STORAGE ENGINE     | NULL              | GPL     || rpl_semi_sync_slave      | ACTIVE | REPLICATION        | semisync_slave.so | GPL     |+--------------------------+--------+--------------------+-------------------+---------+

Add the following configurations in my. cnf of master and slave respectively.

Master

rpl_semi_sync_master_enabled=1rpl_semi_sync_master_timeout=1000rpl_semi_sync_master_trace_level=32rpl_semi_sync_master_wait_no_slave=on

Slave

rpl_semi_sync_slave_enabled=1

Master log

140203 23:06:17 [Note] Semi-sync replication initialized for transactions.140203 23:06:17 [Note] Semi-sync replication enabled on the master.140203 23:06:17 [Note] Server hostname (bind-address): '0.0.0.0'; port: 30307140203 23:06:17 [Note]   - '0.0.0.0' resolves to '0.0.0.0';140203 23:06:17 [Note] Server socket created on IP: '0.0.0.0'.140203 23:06:17 [Warning] 'proxies_priv' entry '@ root@mynode1' ignored in --skip-name-resolve mode.140203 23:06:17 [Note] Event Scheduler: Loaded 0 events140203 23:06:17 [Note] /service/mysql/bin/mysqld: ready for connections.Version: '5.5.34-log'  socket: '/data/mysql/mysql.sock'  port: 30307  MASTER_DB140203 23:06:17 [Note] Event Scheduler: scheduler thread started with id 1140203 23:06:20 [Note] Start semi-sync binlog_dump to slave (server_id: 2), pos(binlog-master.000010, 290)

Slave log

140203 23:06:20 [Note] Slave I/O thread: Start semi-sync replication to master 'rep@mynode1:30307' in log 'binlog-master.000010' at position 290140203 23:06:20 [Note] Slave SQL thread initialized, starting replication in log 'binlog-master.000010' at position 290, relay log './mynode2-relay-bin.000029' position: 440140203 23:06:20 [Note] Event Scheduler: scheduler thread started with id 1140203 23:06:20 [Note] Slave I/O thread: connected to master 'rep@mynode1:30307',replication started in log 'binlog-master.000010' at position 290

MASTER@root@test 11:10:41>show global status like 'rpl%';+--------------------------------------------+-------------+| Variable_name                              | Value       |+--------------------------------------------+-------------+| Rpl_semi_sync_master_clients               | 1           || Rpl_semi_sync_master_net_avg_wait_time     | 619         || Rpl_semi_sync_master_net_wait_time         | 619         || Rpl_semi_sync_master_net_waits             | 1           || Rpl_semi_sync_master_no_times              | 0           || Rpl_semi_sync_master_no_tx                 | 0           || Rpl_semi_sync_master_status                | ON          || Rpl_semi_sync_master_timefunc_failures     | 0           || Rpl_semi_sync_master_tx_avg_wait_time      | 734         || Rpl_semi_sync_master_tx_wait_time          | 734         || Rpl_semi_sync_master_tx_waits              | 1           || Rpl_semi_sync_master_wait_pos_backtraverse | 0           || Rpl_semi_sync_master_wait_sessions         | 0           || Rpl_semi_sync_master_yes_tx                | 1           || Rpl_status                                 | AUTH_MASTER |+--------------------------------------------+-------------+

SLAVE@root@test 11:10:02>show global status like 'rpl%';+----------------------------+-------------+| Variable_name              | Value       |+----------------------------+-------------+| Rpl_semi_sync_slave_status | ON          || Rpl_status                 | AUTH_MASTER |+----------------------------+-------------+