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本文主要給大家介紹MySQL主從復制出現報錯Errno1205解決方案,文章內容都是筆者用心摘選和編輯的,具有一定的針對性,對大家的參考意義還是比較大的,下面跟筆者一起了解下MySQL主從復制出現報錯Errno1205解決方案吧。
nagios報警如下大致意思就是
14:39分 vip發生了漂移
**** Nagios ***** Notification Type: PROBLEM Service: check_ha_mysqld Host: prod-bjuc-mysql1-vip Address: 192.168.87.74 State: CRITICAL Date/Time: Wed Mar 28 14:39:27 CST 2018 Additional Info: CRITICAL: HA Failover from 192.168.87.72 to 192.168.87.123, 192.168.87.123 result:PROCS OK: 1 processes with command name /usr/sbin/mysqld, args VIP=192.168.87.74, 192.168.87.72:PROCS OK: 1 processes with command name /usr/sbin/mysqld
14:46分主從復制中斷
***** Nagios ***** Notification Type: PROBLEM Service: check_mysql_health_slave-sql-running Host: bjuc-mysql1 Address: 192.168.87.72 State: CRITICAL Date/Time: Wed Mar 28 14:46:06 CST 2018 Additional Info: CRITICAL - Slave sql is not running
登錄數據庫云服務器查看主從復制的狀態,發現報錯1205錯
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.87.123 Master_User: zhu Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000481 Read_Master_Log_Pos: 218802975 Relay_Log_File: mysql-relay-bin.000428 Relay_Log_Pos: 2428110 Relay_Master_Log_File: mysql-bin.000481 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: performance_schema,information_schema,test,mysql Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: %.% Replicate_Wild_Ignore_Table: Last_Errno: 1205 Last_Error: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)' Skip_Counter: 0 Exec_Master_Log_Pos: 182088298 Relay_Log_Space: 39142986 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL Master_SSL_Verify_Server_Cert: No Last_IO_Errno: 0 Last_IO_Error: Last_SQL_Errno: 1205 Last_SQL_Error: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)' Replicate_Ignore_Server_Ids: Master_Server_Id: 6 1 row in set (0.00 sec)
查看錯誤日志有一下報錯信息:
錯誤日志中給出了報錯原因和解決方法
tail -70 error.log
180328 14:36:05 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:36:21 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:36:38 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:36:56 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:37:15 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:37:35 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:37:56 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:38:17 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:38:38 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:38:59 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:39:20 [ERROR] Slave SQL: Error 'Lock wait timeout exceeded; try restarting transaction' on query. Default database: 'statusnet'. Query: 'UPDATE notice_status_new set valid = 0 WHERE conversation = 384667 AND user_id IN(4337475,4337529,4337471,4337365)', Error_code: 1205 180328 14:39:20 [ERROR] Slave SQL thread retried transaction 10 time(s) in vain, giving up. Consider raising the value of the slave_transaction_retries variable. 180328 14:39:20 [Warning] Slave: Lock wait timeout exceeded; try restarting transaction Error_code: 1205 180328 14:39:20 [ERROR] Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000481' position 182088298
查看參數結合著兩個參數可以知道主從復制報錯的原因為:
180328 14:39:20 [ERROR] Slave SQL thread retried transaction 10 time(s) in vain, giving up. Consider raising the value of the slave_transaction_retries variable.
180328 14:39:20 [Warning] Slave: Lock wait timeout exceeded; try restarting transaction Error_code: 1205
180328 14:39:20 [ERROR] Error running query, slave SQL thread aborted,Fix the problem, and restart the slave SQL thread with "SLAVE START". We stopped at log 'mysql-bin.000481' position 182088298
因為表notice_status_new產生了鎖,阻塞了這條update語句
參數innodb_lock_wait_time 設置的為15秒,單個事務在等待15秒后開始報1025錯:因為鎖執行超時并重啟事務
參數slave_transaction_retries 設置的為10次,如果事務重試次數超過10次,復制中斷。(但是錯誤日志中嘗試了11次)
mysql> show variables like '%innodb_lock_wait_timeout%'; +--------------------------+-------+ | Variable_name | Value | +--------------------------+-------+ | innodb_lock_wait_timeout | 15 | +--------------------------+-------+ 1 row in set (0.01 sec) mysql> show variables like '%slave_transaction_retries%'; +---------------------------+-------+ | Variable_name | Value | +---------------------------+-------+ | slave_transaction_retries | 10 | +---------------------------+-------+ 1 row in set (0.00 sec)
解決方法:重啟slave后主從復制恢復,并開始追日志
mysql> stop slave; Query OK, 0 rows affected (0.02 sec) mysql> start slave; Query OK, 0 rows affected (0.00 sec) mysql> show slave status\G *************************** 1. row *************************** Slave_IO_Running: Yes Slave_SQL_Running: Yes 1 row in set (0.00 sec)
vip的問題等到晚上在切回來,
---------------------------------我是分割線--------------------------
這次問題雖然解決了,但是發現問題我們一定要找到根音,這樣問題才能算是閉環。
為什么會產生這個鎖呢,因為記錄鎖信息的表都是實時的,現在查不出當時的鎖信息,但是從存儲引擎的運行狀態中還是能發現一些問題,數據庫出現了死鎖!!顯然在update這張表一定會等待的!!
發現了一條奇葩SQL,被鎖的那張表也是notice_status_new
UPDATE notice_status_new SET count = count + 1, push_count = push_count + 1 WHERE conversation = 2609759 AND user_id != 7384662 AND user_id IN(7359498)
show engine innodb status\G 截取死鎖的這部分 ------------------------ LATEST DETECTED DEADLOCK ------------------------ 180328 14:33:52 *** (1) TRANSACTION: TRANSACTION 1B285E9F9, ACTIVE 0 sec starting index read mysql tables in use 1, locked 1 LOCK WAIT 4 lock struct(s), heap size 1248, 3 row lock(s), undo log entries 1 MySQL thread id 3972036, OS thread handle 0x7fc0c3464700, query id 2525495433 192.168.87.42 dstatusnet Updating UPDATE notice_status_new SET count = count + 1, push_count = push_count + 1 WHERE conversation = 2609759 AND user_id != 7384662 AND user_id IN(7359498) *** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 3535 page no 65360 n bits 448 index `conv_user` of table `statusnet`.`notice_status_new` trx id 1B285E9F9 lock_mode X locks rec but not gap waiting Record lock, heap no 241 PHYSICAL RECORD: n_fields 3; compact format; info bits 0 0: len 8; hex 000000000027d25f; asc ' _;; 1: len 4; hex 80704c0a; asc pL ;; 2: len 4; hex 80b1a0fe; asc ;; *** (2) TRANSACTION: TRANSACTION 1B285E9FD, ACTIVE 0 sec starting index read, thread declared inside InnoDB 500 mysql tables in use 1, locked 1 4 lock struct(s), heap size 1248, 3 row lock(s), undo log entries 1 MySQL thread id 3867908, OS thread handle 0x7fbfc6d4f700, query id 2525495437 192.168.87.42 dstatusnet Updating UPDATE notice_status_new SET count = count + 1, push_count = push_count + 1 WHERE conversation = 2609759 AND user_id != 7359498 AND user_id IN(7384662) *** (2) HOLDS THE LOCK(S): RECORD LOCKS space id 3535 page no 65360 n bits 448 index `conv_user` of table `statusnet`.`notice_status_new` trx id 1B285E9FD lock_mode X locks rec but not gap Record lock, heap no 241 PHYSICAL RECORD: n_fields 3; compact format; info bits 0 0: len 8; hex 000000000027d25f; asc ' _;; 1: len 4; hex 80704c0a; asc pL ;; 2: len 4; hex 80b1a0fe; asc ;; *** (2) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 3535 page no 65360 n bits 448 index `conv_user` of table `statusnet`.`notice_status_new` trx id 1B285E9FD lock_mode X locks rec but not gap waiting Record lock, heap no 242 PHYSICAL RECORD: n_fields 3; compact format; info bits 0 0: len 8; hex 000000000027d25f; asc ' _;; 1: len 4; hex 8070ae56; asc p V;; 2: len 4; hex 80b1a0fc; asc ;; *** WE ROLL BACK TRANSACTION (2)
問題找到了,找對該業務的開發,溝通后決定在周六上線新版本,徹底解決問題。
可以寫一個實時監控鎖的腳本,把內容輸出打印,這樣方便以后定位問題!
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后面想了想可能是由于vip漂移導致的主從復制報錯
線上架構為MM+heartbeat
vip漂移的原因待定,vip漂移后,數據庫開始在192.168.87.123云服務器上寫入數據庫,72數據庫作為備份庫,但是還會同步123數據庫的數據,由于192.168.87.72數據庫表notice_status_new還存在死鎖,所以在slave SQL thread應用來自123云服務器的中繼日志時,執行到該SQL時,發生了鎖等待,等待15秒后超時并重新嘗試該事務,嘗試10后,還是在鎖表狀態,slave SQL thread 線程停止工作,主從同步中斷。
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3月29日和開發復盤
因為報警時間不是很準確,實際時間還是以heartbeat日志和mysql日志為準,通過查看日志確定是heartbeat首先發生漂移,然后才是主從復制報錯
主要是討論的問題有兩個
① Heartbeat為什么會發生漂移
通過查看heartbeat日志,72和123存在心跳檢測,在72ping123的時候發生了丟包,
在123ping72的時候正常,72節點以為自己死掉?在14:35:26發生vip漂移,從72漂移到123。
Mar 28 14:35:26 bjuc-mysql1 pengine: [14176]: notice: LogActions: Move VIP_192_168_87_74 (Started bjuc-mysql1 -> prod-uc-yewu-db-slave2)
② 為什么會出現死鎖
從存儲引擎的運行狀態中查看,如果這兩條SQL的請求同時到達數據庫,因為innodb支持到行鎖的粒度,第二條SQL會鎖住很多行,如果和第一條SQL中鎖住有重復的,就會發生相互等待的狀況,所以出現死鎖。
這兩條SQL的where條件如下:
user_id IN(6032694,5824664,4344233,5450840,6032678,4951596,6032668,4344453,6038786,4344347,6032676,5754768);
user_id != 6185996
這兩個條件可能發生邏輯上的沖突,然后導致死鎖
看完以上關于MySQL主從復制出現報錯Errno1205解決方案,很多讀者朋友肯定多少有一定的了解,如需獲取更多的行業知識信息 ,可以持續關注我們的行業資訊欄目的。
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