MySQL主從複製中的問題（Coordinator stopped beacause there were errors in the workers......）
阿新 • • 發佈：2021-11-03
1、show slave status \G 顯示如下報錯資訊：
Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction ...
2、根據提示資訊定位報錯位置
情況一："Delete_rows"
select * from performance_schema.replication_applier_status_by_worker \G
Last_SQL_Error: Could not execute Delete_rowsevent on table xxx ，Can't find record in xxx
原因：在master上刪除一條記錄，而slave上找不到。
解決方法：由於master要刪除一條記錄，而slave上找不到故報錯，這種情況主上都將其刪除了，那麼從機可以直接跳過。
stop slave; set global sql_slave_skip_counter=1; start slave;
如上命令若報錯：ERROR 1858 (HY000): sql_slave_skip_counter can not be set when the server is running with @@GLOBAL.GTID_MODE = ON. Instead, for each transaction that you want to skip, generate an empty transaction with the same GTID as the transaction
或者可以換用如下命令：
STOP SLAVE;
SET @@SESSION.GTID_NEXT= 'f396f867-d755-11xxx85-005xxxxxb5a:264261655' --在session裡設定gtid_next，即跳過這個GTID
BEGIN; COMMIT; --設定空事物
SET SESSION GTID_NEXT = AUTOMATIC; -- 恢復GTID
START SLAVE;xxxx
情況二："Duplicate "
Last_SQL_Error: Could not execute Write_rows event on table xxx; Duplicate entry'xxx' for key 'PRIMARY',
原因：在slave已經有該記錄，又在master上插入了同一條記錄
解決方法：在從庫上刪除該記錄，或者跳過該記錄。然後在master上和slave上再分別確認一下。
情況三："Update_rows" (還未碰到 待驗證)
Last_SQL_Error: Could not execute Update_rows event on table xxx; Can't find record in 'xxx',
參考原因：在master上更新一條記錄，而slave上找不到，丟失了資料。
參考方法：在master上，用mysqlbinlog 分析下出錯的binlog日誌在幹什麼。
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/usr/local/mysql/bin/mysqlbinlog --no-defaults -v -v --base64-output=DECODE-ROWS mysql-bin.000010 | grep -A '10' 794
#120302 12:08:36 server id 22 end_log_pos 794 Update_rows: table id 33 flags: STMT_END_F
### UPDATE hcy.t1
### WHERE
### @1=2 /* INT meta=0 nullable=0 is_null=0 */
### @2='bbc' /* STRING(4) meta=65028 nullable=1 is_null=0 */
### SET
### @1=2 /* INT meta=0 nullable=0 is_null=0 */
### @2='BTV' /* STRING(4) meta=65028 nullable=1 is_null=0 */
# at 794
#120302 12:08:36 server id 22 end_log_pos 821 Xid = 60
COMMIT/*!*/;
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
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在slave上，查詢下更新後的那條記錄，應該是不存在的。
mysql> select * from t1 where id=2;
Empty set (0.00 sec)
然後再到master檢視
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mysql> select * from t1 where id=2;
+----+------+
| id | name |
+----+------+
| 2 | BTV |
+----+------+
1 row in set (0.00 sec)
|
把丟失的資料在slave上填補，然後跳過報錯即可。
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mysql> insert into t1 values (2,'BTV');
Query OK, 1 row affected (0.00 sec)
mysql> select * from t1 where id=2;
+----+------+
| id | name |
+----+------+
| 2 | BTV |
+----+------+
1 row in set (0.00 sec)
mysql> stop slave ;set global sql_slave_skip_counter=1;start slave;
Query OK, 0 rows affected (0.01 sec)
Query OK, 0 rows affected (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status\G;
……
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
……
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