從字面意思看了一下是因為slave_pending_jobs_size_max默認值為16777216(16MB),但是slave接收到的slave_pending_jobs_size_max為17085453(17M);
解決方案
從庫執行如下SQL
mysql>stop slave; mysql>set global slave_pending_jobs_size_max=20000000; mysql> start slave;
#在多線程復制時,在隊列中Pending的事件所占用的最大內存,默認為16M,如果內存富余,或者延遲較大時,可以適當調大;注意
這個值要比主庫的max_allowed_packet大
故障模擬:
從庫設置
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)
主庫操作:
mysql> update erp_mkpf set usnam='測試1864錯誤'; 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='測試1864錯誤'; Query OK, 70466 rowsaffected (0.38 sec) Rows matched:70466 Changed: 70466 Warnings: 0 mysql> commit; Query OK, 0 rowsaffected (0.08 sec)
從庫查看狀態:
mysql> show slavestatus\G 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.
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