Error
Error Code:
1593
MariaDB Error 1593: Fatal Slave Error Encountered
Description
Error 1593, a fatal slave error, indicates a critical issue preventing the replica (slave) from continuing replication operations. This typically occurs due to severe data inconsistencies, corrupted logs, or failures within the replication threads, forcing replication to halt.
Error Message
Fatal error: %s
Known Causes
4 known causesData Inconsistency
The replica encountered data on the primary that conflicts with its own state, preventing it from applying a transaction correctly.
Replication Thread Failure
The replica's I/O thread failed to read events from the primary's binary log, or the SQL thread failed to apply events.
Corrupted Relay or Binary Logs
The replica's relay logs or its own binary logs have become corrupted, preventing the correct processing of replication events.
Resource Exhaustion
The replica server ran out of critical resources like disk space, memory, or CPU, leading to a halt in replication operations.
Solutions
3 solutions available1. Restart the Slave Thread easy
A common cause is a temporary glitch that can be resolved by simply restarting the replication threads.
1
Connect to the MariaDB slave server using a client like `mysql`.
mysql -u your_user -p2
Check the current slave status to confirm it's stopped.
SHOW SLAVE STATUS\G3
If `Slave_IO_Running` and `Slave_SQL_Running` are both 'No', start the slave threads.
START SLAVE;\G4
Verify the slave status again to ensure both threads are running.
SHOW SLAVE STATUS\G2. Reset Slave and Re-sync medium
If restarting doesn't work, the slave might have fallen too far behind or encountered a persistent replication error. Resetting and re-syncing is a more thorough approach.
1
Connect to the MariaDB slave server.
mysql -u your_user -p2
Stop the slave threads.
STOP SLAVE;\G3
Reset the slave configuration and clear its relay logs.
RESET SLAVE;\G4
Obtain the master's binary log file name and position. This is crucial for re-syncing. You can get this from the master server or by examining the slave's error logs if it was previously connected.
On the master: SHOW MASTER STATUS;5
Configure the slave to connect to the master using the obtained master log file and position. Replace `master_host`, `master_user`, `master_password`, `master_log_file`, and `master_log_pos` with your actual values.
CHANGE MASTER TO MASTER_HOST='master_host', MASTER_USER='master_user', MASTER_PASSWORD='master_password', MASTER_LOG_FILE='master_log_file', MASTER_LOG_POS=master_log_pos;\G6
Start the slave threads.
START SLAVE;\G7
Monitor the slave status and error logs for any new issues.
SHOW SLAVE STATUS\G3. Investigate Specific Error Message Details advanced
The `%s` in the error message often contains specific details about what went wrong. Analyzing these details is key to a precise fix.
1
Locate the MariaDB error log on your slave server. The location varies by installation but is often in `/var/log/mysql/error.log` or similar.
tail -f /var/log/mysql/error.log2
Examine the lines immediately preceding and following 'MariaDB Error 1593: Fatal Slave Error Encountered'. The `%s` placeholder will be replaced with the actual error description.
text3
Common specific errors include: `Query caused different errors on master and slave`, `Could not parse event`, `Duplicate entry`, `Table doesn't exist`. Based on the specific error, you might need to:
- **Skip an event:** If a specific event on the master caused an issue (e.g., a duplicate key on the slave that's acceptable), you might be able to skip it. **Use with extreme caution!**
sql
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
START SLAVE; -- if stopped
- **Repair a table:** If the error indicates a corrupted table on the slave.
sql
REPAIR TABLE your_table_name;
- **Resolve data inconsistencies:** This may involve manual data correction on the slave or even re-syncing the entire dataset if the inconsistency is severe.
- **Skip an event:** If a specific event on the master caused an issue (e.g., a duplicate key on the slave that's acceptable), you might be able to skip it. **Use with extreme caution!**
sql
SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;
START SLAVE; -- if stopped
- **Repair a table:** If the error indicates a corrupted table on the slave.
sql
REPAIR TABLE your_table_name;
- **Resolve data inconsistencies:** This may involve manual data correction on the slave or even re-syncing the entire dataset if the inconsistency is severe.
sql (example)4
After attempting a fix for the specific error, restart the slave threads if they were stopped.
START SLAVE;\G5
Monitor the slave status and error logs closely.
SHOW SLAVE STATUS\G
tail -f /var/log/mysql/error.log