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Could Not Find Target Log During Relay Log Initialization

MySQL Server Administration Security Backup and Recovery Optimization Language Structure Globalization Data Types Functions and Operators SQL Statement Syntax The InnoDB Storage

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Engine Alternative Storage Engines High Availability and Scalability Replication Configuring Replication Binary Log File Position Based Replication Configuration Overview Setting Up Binary Log File Position Based Replication Setting the Replication Master Configuration Creating a User for Replication Obtaining the Replication Master Binary Log mysql relay log vs binlog Coordinates Choosing a Method for Data Snapshots Setting Up Replication Slaves Adding Slaves to a Replication Environment Replication with Global Transaction Identifiers GTID Concepts Setting Up Replication Using GTIDs Using GTIDs for Failover and Scaleout Restrictions on Replication with GTIDs MySQL Multi-Source Replication MySQL Multi-Source Replication Overview Multi-Source Replication Tutorials Multi-Source Replication Monitoring Multi-Source Replication Error Messages Changing Replication Modes on Online Servers Replication Mode Concepts Enabling GTID Transactions Online Disabling GTID Transactions Online Verifying Replication of Anonymous Transactions Replication and Binary Logging Options and Variables Replication and Binary Logging Option and Variable Reference Replication Master Options and Variables Replication Slave Options and Variables Binary Logging Options and Variables Global Transaction ID Options and Variables Common Replication Administration Tasks Checking Replication Status Pausing Replication on the

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 hung up on error that looked like this: 071118 16:44:10

Could Not Initialize Master Info Structure

[ERROR] Failed to open the relay log './-relay-bin.003525' (relay_log_pos 22940879) 071118 16:44:10 [ERROR] Could not mysql show relay logs 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 my.cnf relay-log 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 really seem like it got to the root of the problem. Why would one slave care about another, if https://dev.mysql.com/doc/refman/5.7/en/slave-logs-relaylog.html 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 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 http://dev.nuclearrooster.com/2009/03/06/relay-log-issues-when-starting-mysql-replication-slave/ 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 for me, after I searched several other places trying to figure out why my replication was no longer working. Thanks so much for posting it! Frank says: April 2, 2012 at 2:18 am Thanks for th hint. Smoking brain before. Chileno says: September 25, 2013 at 7:33 am Cool! Save my time Brandon says: September 29, 2013 at 4:53

After everything is back to operational - I noticed that the replication has stopped in this slave. I tried to restart the replication but it http://passionatedevelopment.com/blog/2011/06/11/missing-relay-log-file-after-mysql-crash/ was unsuccessful. I then checked the MySQL log and found the following: [bash] 110606 17:01:30 [ERROR] Failed to open the relay log './forbes-relay-bin.785212' (relay_log_pos 14931) 110606 17:01:30 [ERROR] Could not find http://stackoverflow.com/questions/9711551/moving-a-mysql-slave-to-new-hard-drives-do-i-need-mysqld-relay-bin-logs target log during relay log initialization 110606 17:01:30 [ERROR] Failed to initialize the master info structure [/bash] And so MySQL is complaining that it can’t find the relay log file and sure relay log enough I had a look into the directory, I couldn’t find it. So what to do? I Googled around for some magic solutions - this link came up on top. The proposed solution was to: CHANGE MASTER TO the positon _on the master_ where the slave was, the slave will get the transactions from the master binary logs again and you will lose nothing. could not find Requires that the master still has those binary logs. However this is not the problem, it is not that the slave doesn’t know the master bin log position. My guess is the relay log is now outdated and needs to be regenerated. So what we really need to do is to tell the slave to regenerate its relay log files. Here are the steps to do it: On the crashed slave - record the last Master bin log file and position before the crash The slave should not be running - if it is - issue STOP SLAVE And then issue RESET SLAVE command Go to the MySQL directory - ensure that relay logs, master info and relay-log.info are deleted - they should be deleted when you run RESET SLAVE. Note: When I did this the first time - MySQL didn't delete the relay logs - running RESET SLAVE the second time fixed it Now issue CHANGE_MASTER log position to the position that you have recorded on step 1 above Issue START SLAVE Now the replication should start again - you will notice that the relay log files are re-num

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 Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Moving a MySQL slave to new hard drives - do I need mysqld-relay-bin logs? up vote 1 down vote favorite I am moving a MySQL slave from one set of HDs to another. The configuration of the machine denies me the ability to have both old and new hard drives on it at the same time. So I rsync'ed the data directory to another machine. Whe the new hard drives came online, I rsyn'ed the data dir back. This worked fine. However, I cannot start replication. This is the error I get. 120314 4:23:07 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=mysqld-relay-bin' to avoid this problem. 120314 4:23:07 [ERROR] Failed to open the relay log '/var/lib/mysqllogs/mysqld-relay-bin.000273' (relay_log_pos 677043943) 120314 4:23:07 [ERROR] Could not find target log during relay log initialization 120314 4:23:07 [ERROR] Failed to initialize the master info structure I found this comment: http://serverfault.com/questions/61471/moving-a-mysql-slave-to-a-new-host-failed-to-open-the-relay-log If it is just complaining about the relay logs, in most cases, they are disposable if the master still has the binary logs around. You can just run CHANGE MASTER TO on the slave and it will flush the existing relay logs and start anew. You don't need to make a new fresh copy. This seems to suggest that I do not need these log files. The host name is not changing. My Questions: Do I need these log files? If not, what do I need to do to get replication started? Will it remember where it left off? If I do need these log files, is there anything else I'm forgetting? mysql replication slave share|improve this question asked Mar 14 '12 at 22:55 Chris Stewart 63 add a comment| 1 Answer 1 active oldest votes up vote 4 down vote I don't think you need the relay bin loge files to get it to work. It might remember where it left off, did you t

 

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