pt-table-checksum 3.0.4检测不出主从差异数据

群里好几位同学问 pt-table-checksum 3.0.4，主从两个表数据是不一致，为啥检测不出来？前段时间自己也测试过，只是没整理成随笔^_-

一、基本环境

VMware10.0+CentOS6.9+MySQL5.7.19

ROLE	HOSTNAME	BASEDIR	DATADIR	IP	PORT
Master	ZST1	/usr/local/mysql	/data/mysql/mysql3306/data	192.168.85.132	3306
Slave	ZST2	/usr/local/mysql	/data/mysql/mysql3306/data	192.168.85.133	3306

基于Row+Gtid搭建的一主一从复制结构：Master->Slave

二、构造差异数据

借助样例数据库sakila做测试

# 主库flush logs
mydba@192.168.85.132,3306 [sakila]> flush logs;

# 主库开启general_log
[root@ZST1 ~]# rm -rf /data/mysql/mysql3306/data/mysql-general.log
mydba@192.168.85.132,3306 [sakila]> set global general_log_file='/data/mysql/mysql3306/data/mysql-general.log';
mydba@192.168.85.132,3306 [sakila]> set global general_log =1;
mydba@192.168.85.132,3306 [sakila]> show variables like 'general_log%';

# 从库修改部分数据，造成不一致
mydba@192.168.85.133,3306 [sakila]> delete from sakila.actor where actor_id<=3; # 外键约束删除失败
mydba@192.168.85.133,3306 [sakila]> update sakila.actor set last_name=first_name where actor_id<=3;
# 主库sakila.actor数据
mydba@192.168.85.132,3306 [sakila]> select * from sakila.actor limit 3;
+----------+------------+-----------+---------------------+
| actor_id | first_name | last_name | last_update         |
+----------+------------+-----------+---------------------+
|        1 | PENELOPE   | GUINESS   | 2006-02-15 04:34:33 |
|        2 | NICK       | WAHLBERG  | 2006-02-15 04:34:33 |
|        3 | ED         | CHASE     | 2006-02-15 04:34:33 |
+----------+------------+-----------+---------------------+
# 从库sakila.actor数据
mydba@192.168.85.133,3306 [sakila]> select * from sakila.actor limit 3;
+----------+------------+-----------+---------------------+
| actor_id | first_name | last_name | last_update         |
+----------+------------+-----------+---------------------+
|        1 | PENELOPE   | PENELOPE  | 2017-11-08 09:54:10 |
|        2 | NICK       | NICK      | 2017-11-08 09:54:10 |
|        3 | ED         | ED        | 2017-11-08 09:54:10 |
+----------+------------+-----------+---------------------+

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