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error failed to initialize the master info structure

by Harjit Lakhan on Thu 13 Nov 2014 12:06 UTC ERROR: 091104 11:12:49 [ERROR] Failed to open error reading master configuration the relay log '/var/run/mysqld/mysqld-relay-bin.9339843' (relay_log_pos 233) 091104 11:12:49 [ERROR] Could not error counting relay log space find target log during relay log initialization 091104 11:12:49 [ERROR] Failed to initialize the master failed to open the relay log info structure Due to the way in which the master and slaves where stoppedthe relay logs got out of sync, hence replication would could not find target log during relay log initialization not restart. Found the solution was to a) make a note of Master_Log_File and Exec_Master_Log_Pos mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Master_Host: mk-tacacs-1.auth.as9105.net Master_User: repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: log-bin.000008 Read_Master_Log_Pos: 9684 Relay_Log_File: mysqld-relay-bin.9339637 Relay_Log_Pos: 233

Error 1202

Relay_Master_Log_File: log-bin.000008 Slave_IO_Running: No Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 0 Last_Error: Skip_Counter: 0 Exec_Master_Log_Pos: 9684 Relay_Log_Space: 0 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 b) reset the slave and bypass the relay logs by configuring the replication again. reset slave; CHANGE MASTER TO MASTER_HOST='mk-tacacs-1.auth.as9105.net' CHANGE MASTER TO MASTER_LOG_FILE='log-bin.000008'; CHANGE MASTER TO MASTER_LOG_POS=9684; start slave; Search MySQL Links MySQL Downloads MySQL Docs MySQL Bugs MySQL Forums Planet MySQL © 1995, 2016, Oracle Corporation and/or its affiliates Legal Policies | Your Privacy Rights | Terms of Use Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.

created relay files in /var/run/mysqld/ which filled up the whole of the partition and caused errors in the logs. To repair the problem

Got Fatal Error 1236 From Master When Reading Data From Binary Log

i ran {{{RESET MASTER}}} on the master db server and removed change master to the relay files from the slave. This didn't have the desired affect. >Start slave; "Error reading slave could not find first log file name in binary log index file log configuration" I then banged my head against the wall. A blog documented a similar problem whereby the files master.info and relay-bin.info were both empty. And to delete them http://planet.mysql.com/entry/?id=2181124 Gung-Ho I deleted the following sudo rm /var/lib/mysql/relay-log.info sudo rm /var/lib/mysql/master.info sudo rm /var/runmysqld/* Restarted slave and everything was back to normal.... apart from the data loss. See Mysqldump and restore slave from master using bash Handling other Errors Error "ERROR 1201 (HY000): Could not initialize master info structure; more error messages can be found in the http://perplexed.co.uk/301_restoring_a_broken_slave.htm MySQL error log" I opened the syslog where the message said >sudo less /var/log/syslog [ERROR] Failed to open the relay log '/var/run/mysqld/mysqld-relay-bin.000040' (relay_log_pos 202987) I opened up the relay-log.info file >sudo nano /var/lib/mysql/relay-log.info /var/run/mysqld/mysqld-relay-bin.000040 ... In the directory /var/run/mysqld/ and the mysql directory log file mysqld-relay-bin.index there were only three files mentioned, which did not include mysqld-relay-bin.000040. I deleted the the relay-log.info file sudo rm /var/lib/mysql/relay-log.info And restarted mysql slave successfully. Error: "Slave_IO_Running: No" I got this another day mysql> SHOW SLAVE STATUS\G ... Slave_IO_Running: No Slave_SQL_Running: Yes ... The log file defined in "my.cnf" err-log=/data/logs/mysqld/mysqld.log Looking in err-log=/data/logs/mysqld/mysqld.log contained the following lines. 080718 10:35:34 [Note] Slave I/O thread: connected to master 'replicateuser@1.2.3.4:3306', replication started in log 'db1-bin.000125' at position 920655371 080718 10:35:34 [ERROR] Error reading packet from server: log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master (server_errno=1236) 080718 10:35:34 [ERROR] Got fatal error 1236: 'log event entry exceeded max_allowed_packet; Increase max_allowed_packet on master' from master when reading data from binary log 080718 10:35:34 [ERROR] Slave I/O thread exiting, re

into a little issue setting up a MySQL slave. I have done this a least a have dozen times before, and it is always pretty painless, but this time, I kept getting http://dev.nuclearrooster.com/2009/03/06/relay-log-issues-when-starting-mysql-replication-slave/ hung up on error that looked like this: 071118 16:44:10 [ERROR] Failed to http://serverfault.com/questions/715849/hard-reboot-causes-mysql-replication-to-break open the relay log './-relay-bin.003525' (relay_log_pos 22940879) 071118 16:44:10 [ERROR] Could not find target log during relay log initialization 071118 16:44:10 [ERROR] Failed to initialize the master info structure Googling a little turned up this mysql forum, http://forums.mysql.com/read.php?26,112490,223025#msg-223025 Which then led me to this mysql doc page http://dev.mysql.com/doc/refman/5.0/en/replication-howto-additionalslaves.html This was confusing, and didn't relay log really seem like it got to the root of the problem. Why would one slave care about another, if they were both reading from the master? I think that article would more accurately be called "Making a slave of a slave" or some such, because "Introducing Additional Slaves to an Existing Replication Environment" does not convey that they are talking about a slave of a could not find slave (which I think they are). Anyway, long and short of it, I removed the ‘master.info' ‘mysqld-relay-bin.*' ‘relay-log.info' ‘relay-log-index.*' from the MySQL data directory, restarted mysql (‘/etc/init.d/mysql restart'), and off to the races. Sometimes, depending on the order you do edit the configs or restart mysql, you can get bad data in those files, and it can lead to crpytic errors. Remove those, and you can always start fresh. This entry was posted in Uncategorized. Bookmark the permalink. 6 thoughts on “Relay log issues when starting MySQL replication slave” Akom says: May 2, 2011 at 1:33 pm That really helped - mine broke with a 5.0 to 5.1 upgrade on the slave (master is still 5.0). Deleted files, started, (it tried to play from beginning of relay logs, with duplicate errors), stop slave, change master to previously shown master position, start slave - and it's all good. Whew DR.J says: September 9, 2011 at 5:22 am Thanks you made my Friday. My instance pointed to the default relay log, even though I had defined a different one. Deleting them worked for me too. Sam says: February 7, 2012 at 11:30 am That worked great fo

Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Server Fault Questions Tags Users Badges Unanswered Ask Question _ Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Hard reboot causes MySQL replication to break up vote 0 down vote favorite I have encountered an issue with my replication setup. Under normal circumstances it performs as intended, but it breaks if it encounters a hard reboot (I pull the power cable). Setup The setup consists of two servers, server-1 and server-2. The replication setup is a circular replication. Both servers are slaves replicating from the other host as if it were the master. Software Red Hat 6.5 MySQL 5.1.73-3 MySQL-libs 5.1.73-3 MySQL-server 5.1.73-3 Redundancy configuration The replication configuration is as follows for server-1, and is mirrored for server-2: GRANT REPLICATION SLAVE ON *.* TO 'replicant'; FLUSH TABLES WITH READ LOCK;" #Use "SHOW MASTER STATUS \G;" to determine log position and log file UNLOCK TABLES; # set status on slave server using the values retieved earlier CHANGE MASTER TO MASTER_HOST='server-2', MASTER_USER='replicant', MASTER_LOG_FILE='[log file]', MASTER_LOG_POS=[log pos];" START SLAVE; Error information This information is retrieved when the server-2 has encountered a hard reboot and the replication is broken. server-1 slave status *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: server-2 Master_User: replicant Master_Port: 3306 Connect_Retry: 60 Master_Log_File: bin.000004 Read_Master_Log_Pos: 37550 Relay_Log_File: relay.000427 Relay_Log_Pos: 245 Relay_Master_Log_File: bin.000004 Slave_IO_Running: Yes Slave_SQL_Running: Yes Replicate_Do_DB: Re

 

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