中国·8455线路检测中心(Macau)股份有限公司-Official website

从字面意思看了一下是因为slave_pending_jobs_size_max默认值为16777216（16MB），但是slave接收到的slave_pending_jobs_size_max为17085453（17M）；

解决方案

从库执行如下SQL

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mysql>stop slave;

mysql>set global slave_pending_jobs_size_max=20000000;

mysql> start slave;

#在多线程复制时，在队列中Pending的事件所占用的最大内存，默认为16M，如果内存富余，或者延迟较大时，可以适当调大;注意这个值要比主库的max_allowed_packet大

故障模拟：

从库设置

mysql> set global slave_parallel_workers=4;

mysql> show variables like 'slave_parallel_workers';

+------------------------+-------+

| Variable_name | Value |

+------------------------+-------+

|slave_parallel_workers | 4 |

+------------------------+-------+

1 row in set (0.00sec)

mysql>set global slave_pending_jobs_size_max=1024;

mysql> show variables like 'slave_pend%';

+-----------------------------+-------+

| Variable_name | Value |

+-----------------------------+-------+

|slave_pending_jobs_size_max | 1024 |

+-----------------------------+-------+

1 row in set (0.00sec)

主库操作：

mysql> update erp_mkpf set usnam='测试1864错误';

ERROR 1197 (HY000):Multi-statement transaction required more than 'max_binlog_cache_size' bytes ofstorage; increase this mysqld variable and try again

mysql> set global max_binlog_cache_size=8388608000000;

Query OK, 0 rowsaffected (0.00 sec)

mysql> begin;

Query OK, 0 rowsaffected (0.00 sec)

mysql> update erp_mkpf set usnam='测试1864错误';

Query OK, 70466 rowsaffected (0.38 sec)

Rows matched:70466 Changed: 70466 Warnings: 0

mysql> commit;

Query OK, 0 rowsaffected (0.08 sec)

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从库查看状态：

mysql> show slavestatusG

Last_SQL_Errno: 1864

Last_SQL_Error: Cannot scheduleevent Update_rows, relay-log name ./HE1-relay-bin.000005, position 494 toWorker thread because its size 8200 exceeds 1024 ofslave_pending_jobs_size_max.

解决mysql 1864 主从错误