简述mysql半同步复制—semisync
#master中mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';
Query OK, 0 rows affected (0.00 sec)
mysql> show global 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 |
+------------------------------------+-------+
4 rows in set (0.01 sec)
mysql> set global rpl_semi_sync_master_enabled = 1;#开启master上的semisync，设置超时时间，可以通过设置rpl_semi_sync_master_timeout变量来修改，默认单位为毫秒
Query OK, 0 rows affected (0.00 sec)
mysql> show status like '%Rpl_semi_sync%';
+--------------------------------------------+-------+
| Variable_name | Value |
+--------------------------------------------+-------+
| Rpl_semi_sync_master_clients | 1 |
| Rpl_semi_sync_master_net_avg_wait_time | 565 |
| Rpl_semi_sync_master_net_wait_time | 3391|
| Rpl_semi_sync_master_net_waits | 6 |
| Rpl_semi_sync_master_no_times | 1 |
| Rpl_semi_sync_master_no_tx | 12 |
| Rpl_semi_sync_master_status | ON |
| Rpl_semi_sync_master_timefunc_failures | 0 |
| Rpl_semi_sync_master_tx_avg_wait_time | 588 |
| Rpl_semi_sync_master_tx_wait_time | 3528|
| Rpl_semi_sync_master_tx_waits | 6 |
| Rpl_semi_sync_master_wait_pos_backtraverse | 0 |
| Rpl_semi_sync_master_wait_sessions | 0 |
| Rpl_semi_sync_master_yes_tx | 6 |
+--------------------------------------------+-------+
14 rows in set (0.00 sec)
#slave中
mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';
Query OK, 0 rows affected (0.00 sec)
mysql> show global variables like '%semi%';
+---------------------------------+-------+
| Variable_name | Value |
+---------------------------------+-------+
| rpl_semi_sync_slave_enabled | OFF |
| rpl_semi_sync_slave_trace_level | 32 |
+---------------------------------+-------+
2 rows in set (0.00 sec)
mysql> set global rpl_semi_sync_slave_enabled = 1;
Query OK, 0 rows affected (0.00 sec)
mysql> stop slave IO_THREAD;start slave IO_THREAD;#重启slave上的IO线程
Query OK, 0 rows affected (0.09 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> show status like '%Rpl_semi_sync%';
+----------------------------+-------+
| Variable_name | Value |
+----------------------------+-------+
| Rpl_semi_sync_slave_status | ON |
+----------------------------+-------+
1 row in set (0.00 sec)
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