<p>The replica cannot locate the master info file or table needed to connect to its source.</p>
<p>MySQL Error 1617 WARN_NO_MASTER_INFO means the replica cannot find the master info file or table that stores source connection details. Run CHANGE MASTER TO with the correct host, log, and position, then START REPLICA to recreate the metadata and resume replication.</p>
The master info structure does not exist
Error 1617 occurs when the MySQL replication slave cannot locate the master info structure. This structure is normally stored in the master.info file or mysql.slave_master_info table and contains the host, log file, and position of the replication source.
When the file or table is missing, corrupted, or inaccessible, the IO thread stops and the server raises the WARN_NO_MASTER_INFO warning. Replication will not proceed until the information is recreated.
The error is commonly triggered after accidental deletion of the master.info file, filesystem failures, or when upgrading from older MySQL versions that stored replication metadata in a different location.
It also appears if you start a server as a replica without running CHANGE MASTER TO or if the mysql.slave_master_info table has been truncated.
First confirm that the replica really needs to connect to a master. If so, recreate the metadata using a CHANGE MASTER TO statement that points to the correct source host, log file, and position.
After running CHANGE MASTER TO, start the replica with START REPLICA; (or START SLAVE; in older versions) and verify that both IO and SQL threads show Running.
If you switched to GTID replication, set MASTER_AUTO_POSITION = 1 instead of specifying a file and position. This repopulates the master info table automatically.
When cloning a production database for testing, remove the relay log files and run RESET SLAVE ALL; before configuring the new master details.
Keep the datadir on reliable storage and include master.info or the mysql.slave_master_info table in backups.
Automate replication setup with scripts or tools so CHANGE MASTER TO is always executed after provisioning a replica.
Error 1201 (HY000) - Could not connect to master: usually follows 1617 when the host details are wrong. Double check host and port.
Error 1593 (HY000) - Relay log read failure: appears if relay logs are inconsistent. Run RESET SLAVE to regenerate them.
The physical file was deleted or not copied when provisioning the replica, leaving no replication metadata.
Table damage after crash or improper shutdown prevents the server from reading master connection details.
A new replica was started without being pointed to a source, so no master info exists.
The MySQL process lacks read access to the master info file or InnoDB tablespace that stores replication metadata.
Indicates network or authentication issue between replica and master.
Shows that the relay log is corrupt or missing.
Occurs when relay log metadata cannot be created, often after disk issues.
Appears when using legacy START SLAVE syntax in newer MySQL versions.
Only delete it if you plan to reconfigure replication with CHANGE MASTER TO. Otherwise keep it to preserve position.
Yes. Without master info the IO thread cannot start, so no new events are pulled from the source.
RESET SLAVE ALL removes existing metadata and is useful before re-running CHANGE MASTER TO, but by itself it does not populate master info.
Galaxy's versioned SQL workspace stores your CHANGE MASTER TO statements and allows team review, reducing the chance of misconfigured replicas.
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