标签:5.7并行复制
开启多线程复制,默认关键的参数有两个:
mysql> show variables like ‘slave_parallel_%‘;
+------------------------+---------------+
| Variable_name | Value |
+------------------------+---------------+
| slave_parallel_type | DATABASE |
| slave_parallel_workers | 0 |
+------------------------+---------------+
2 rows in set (0.00 sec)
slave-parallel-type 默认值为database
slave-parallel-workers 默认值为0
在线开启:
mysql> stop slave sql_thread;
Query OK, 0 rows affected (0.07 sec)
mysql> set global slave_parallel_type=‘LOGICAL_CLOCK‘;
Query OK, 0 rows affected (0.00 sec)
mysql> set global slave_parallel_workers=4;
Query OK, 0 rows affected (0.00 sec)
mysql> start slave sql_thread;
Query OK, 0 rows affected (0.06 sec)
优化选项:
启用table模式是因为如果在多线程模式下,会频繁更新master.info文件,消耗代价过高,并且此值也不是非常准确
master_info_repository=table 对应的表为mysql.slave_master_info
relay_log_recovery=on
relay_log_info_repository=table 对应的表为mysql.slave_relay_log_info
标签:5.7并行复制
原文地址:http://gaoquan.blog.51cto.com/4503718/1739294