Error
Error Code:
1594
MariaDB Error 1594: Relay Log Read Failure
Description
Error 1594 signifies a critical failure on a MariaDB replica (slave) server when attempting to read events from its relay log. This typically happens when the replica cannot access, read, or process the relay log file, hindering its ability to apply updates from the primary server.
Error Message
Relay log read failure: %s
Known Causes
4 known causesCorrupt Relay Log File
The relay log file on the replica server may have become corrupted due to unexpected shutdowns or underlying disk issues.
Insufficient Disk Space
The disk partition where relay logs are stored has run out of space, preventing new log entries or proper file operations.
Incorrect File Permissions
The MariaDB server process lacks the necessary read/write permissions for the relay log directory or files.
Underlying I/O Errors
Problems with the storage system or hardware prevent the replica from reliably reading the relay log files.
Solutions
3 solutions available1. Restart the MariaDB Service easy
A simple restart can often resolve transient relay log read issues.
1
Connect to your MariaDB server via SSH or a terminal.
2
Restart the MariaDB service using your system's service manager.
sudo systemctl restart mariadb3
Verify the MariaDB service status to ensure it started successfully.
sudo systemctl status mariadb2. Check and Repair Relay Log Files medium
Corrupted or incomplete relay log files can cause read failures. This involves checking file integrity and potentially re-creating them.
1
Identify the location of your relay log files. This is typically specified by the `relay_log` and `relay_log_index` variables in your MariaDB configuration file (`my.cnf` or `mariadb.conf.d/*`).
SHOW VARIABLES LIKE 'relay_log%';2
Stop the MariaDB service.
sudo systemctl stop mariadb3
Navigate to the directory where your relay logs are stored.
cd /var/lib/mysql/4
Examine the relay log files for any obvious corruption (e.g., incomplete files, zero-byte files). You might see files like `hostname-bin.000001`, `hostname-bin.index`.
ls -lh5
If you suspect corruption, you can try to repair them. However, a more robust solution is to clean them up if they are no longer needed for replication. **WARNING:** This can break replication if the slave is not in sync. Ensure you understand the implications before proceeding.
# To remove old relay logs (use with caution):
# rm hostname-bin.000001*6
Alternatively, if replication is broken and you need to reset it, you can delete all relay logs and the binary log index file, and then reconfigure replication.
# WARNING: This will break replication and require re-configuration.
# Be absolutely sure before executing these commands.
rm hostname-bin.*
rm hostname-bin.index7
Start the MariaDB service.
sudo systemctl start mariadb8
If you had to reconfigure replication, follow the appropriate steps to set up a new master-slave relationship.
3. Verify Disk Space and Permissions medium
Insufficient disk space or incorrect file permissions for relay log directories can lead to read failures.
1
Identify the directory where your relay logs are stored (as found in Solution 2, Step 1).
2
Check the available disk space on the partition where the relay logs reside.
df -h /var/lib/mysql/3
Ensure that the MariaDB user (typically `mysql`) has read and write permissions to the relay log directory and its files.
sudo chown -R mysql:mysql /var/lib/mysql/
sudo chmod -R 755 /var/lib/mysql/4
If disk space is low, free up space or expand the partition.
5
Restart the MariaDB service after making any permission or disk space adjustments.
sudo systemctl restart mariadb