1、从库执行了事务，主库执行语句时导致冲突：

解决办法一：跳过错误(少数错误推荐)

(1)停止slave进程
(2)设置事务号，事务号从Executed_Gtid_Set事务号+1获取，即跳过当前执行完成的下一条事务，在session里设置gtid_next，即跳过这个GTID
(3)执行空事物
(4)恢复自动事物号
(5)启动slave进程

mysql> STOP SLAVE;
mysql> SET @@SESSION.GTID_NEXT= '8f9e146f-0a18-11e7-810a-0050568833c8:4';
mysql> BEGIN; COMMIT;
mysql> SET SESSION GTID_NEXT = AUTOMATIC;
mysql> START SLAVE;

解决办法二：重置master方法跳过错误(不推荐，因为需要执行reset master;如果其他节点记录有该实例的位点信息的话，切换时需要重新找位点）

mysql> STOP SLAVE;
mysql> RESET MASTER;
mysql> SET @@GLOBAL.GTID_PURGED ='8f9e146f-0a18-11e7-810a-0050568833c8:1-4';
mysql> START SLAVE;

上面这些命令的用意是，忽略8f9e146f-0a18-11e7-810a-0050568833c8:1-4 这个GTID事务，下一次事务接着从 5 这个GTID开始，即可跳过上述错误。

解决办法三：使用pt-slave-restart工具，忽略特定错误，（冲突较多时可以使用，建议保留relaylog核对事务），

pt-slave-restart工具的作用是监视某些特定的复制错误，然后忽略，并且再次启动SLAVE进程（Watch and restart MySQL replication after errors）。

pt-slave-restart工具原理初探
1、检查版本信息和兼容性
set autocommit=1
SHOW VARIABLES LIKE 'wait\_timeout'
SET SESSION wait_timeout=10000
SELECT @@SQL_MODE
SET @@SQL_QUOTE_SHOW_CREATE = 1/*!40101, @@SQL_MODE='NO_AUTO_VALUE_ON_ZERO,NO_ENGINE_SUBSTITUTION'*/
SELECT @@SERVER_ID
SHOW SLAVE STATUS
SELECT CONCAT(@@hostname, @@port)
SHOW VARIABLES LIKE 'version%'
SHOW ENGINES
SHOW VARIABLES LIKE 'innodb_version'
SELECT @@GLOBAL.gtid_mode（是否开启GTID决定跳过事务的方式）
SELECT @@GLOBAL.slave_parallel_workers AS threads(不支持并行复制)
2、检查同步错误
SHOW SLAVE STATUS;
如果使用--error-numbers则检查Last_SQL_Errno：错误号，判断是否匹配；如果匹配继续进行，不匹配不做任何操作
如果使用--error-text则检查Last_SQL_Error：报错内容，判断是否匹配；如果匹配继续进行，不匹配不做任何操作
3、跳过事务
SET GTID_NEXT='026b75e5-d99f-11e7-a343-000c29dc5f5c:2023';
set autocommit=0;
commit;
set autocommit=1;
SET GTID_NEXT='AUTOMATIC';
START SLAVE;
4、继续判断状态，如果还有报错继续2,3，4步骤
SHOW SLAVE STATUS;

mysql> show slave status\G
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.137.101
Master_User: repluser
Master_Port: 3307
Connect_Retry: 60
Master_Log_File: mysql-bin.000003
Read_Master_Log_Pos: 3435
Relay_Log_File: mysql-relay-bin.000016
Relay_Log_Pos: 1026
Relay_Master_Log_File: mysql-bin.000003
Slave_IO_Running: Yes
Slave_SQL_Running: No
Replicate_Wild_Ignore_Table: passport.cooke,passport.user_token,sysbench_test.sbtest1,sysbench_test.sbtest_1
Last_Errno: 1062
Last_Error: Error 'Duplicate entry '9' for key 'PRIMARY'' on query. Default database: 'test'. Query: 'insert into backup_test (id,backup_que) values(9,'1_111')'
Skip_Counter: 0
Exec_Master_Log_Pos: 2856
Relay_Log_Space: 2362
Last_SQL_Errno: 1062
Last_SQL_Error: Error 'Duplicate entry '9' for key 'PRIMARY'' on query. Default database: 'test'. Query: 'insert into backup_test (id,backup_que) values(9,'1_111')'
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1013307
Master_UUID: 026b75e5-d99f-11e7-a343-000c29dc5f5c
Master_Info_File: mysql.slave_master_info
Last_SQL_Error_Timestamp: 180504 11:58:07
Retrieved_Gtid_Set: 026b75e5-d99f-11e7-a343-000c29dc5f5c:1004-2018
Executed_Gtid_Set: 026b75e5-d99f-11e7-a343-000c29dc5f5c:1-2016,
5f5c73b5-2768-11e8-9e7e-000c298bd943:1-2997,
68be50a9-3ba1-11e8-a25d-000c298bd943:1-4
Auto_Position: 1

[root@vm102 yum.repos.d]# pt-slave-restart --user=mg -h227.0.0.1 -P3307 -p123qwe --error-numbers=1062
2018-05-04T11:47:31 P=3307,h=127.0.0.1,p=...,u=mg mysql-relay-bin.000016 448 1062
2018-05-04T11:47:31 P=3307,h=127.0.0.1,p=...,u=mg mysql-relay-bin.000016 737 1062

[root@vm102 yum.repos.d]# pt-slave-restart --user=mg -h227.0.0.1 -P3307 -p123qwe --error-text="backup_test"
2018-05-04T12:00:23 P=3307,h=127.0.0.1,p=...,u=mg mysql-relay-bin.0000161026 1062
2018-05-04T12:00:24 P=3307,h=127.0.0.1,p=...,u=mg mysql-relay-bin.0000161315 1062

参数解释：
--slave-password=s Sets the password to be used to connect to the slaves
--slave-user=s Sets the user to be used to connect to the slaves
--sleep=i Initial sleep seconds between checking the slave ( default 1)
--socket=s -S Socket file to use for connection=
--password=s-p Password to use when connecting
pt-slave-resetart -S./mysql.sock —error-numbers=1032
--error-numbers=h Only restart this comma-separated list of errors
--host=s-h Connect to host
--user=s-u User for login if not current user