Error
Error Code:
1596
MariaDB Error 1596: Slave Replication Event Failure
Description
Error 1596 occurs on a MariaDB slave server when it fails to create a required replication event, often within the relay log or during the application of events from the master. This failure typically prevents the slave from processing further replication events, causing replication to stop or fall behind.
Error Message
Failed to create %s
Known Causes
3 known causesInsufficient Disk Space
The slave server has run out of available disk space, preventing it from writing new relay log files or other necessary replication events.
Incorrect File Permissions
The MariaDB server process lacks the necessary write permissions for its data directory, relay log directory, or temporary file locations.
File System Corruption or I/O Errors
Underlying file system corruption or hardware I/O errors on the slave server can prevent MariaDB from creating or writing to files.
Solutions
4 solutions available1. Restart Replication Threads easy
A common cause is a temporary glitch; restarting replication threads can resolve it.
1
Connect to your MariaDB slave server.
2
Stop the replication threads.
STOP SLAVE;3
Check the status of the slave to ensure it has stopped cleanly.
SHOW SLAVE STATUS\G4
Start the replication threads again.
START SLAVE;5
Monitor the slave status to confirm replication is working.
SHOW SLAVE STATUS\G2. Resynchronize Slave with Master medium
If replication is persistently failing, the slave's data might be out of sync. Re-establishing the connection with a fresh sync point is often necessary.
1
On the slave, stop replication.
STOP SLAVE;2
On the master, get the current binary log file and position.
SHOW MASTER STATUS\G3
On the slave, reset the slave configuration.
RESET SLAVE ALL;4
On the slave, reconfigure the slave to connect to the master using the binary log position obtained in step 2. Replace `master_host`, `master_port`, `master_log_file`, and `master_log_pos` with your actual values.
CHANGE MASTER TO MASTER_HOST='master_host', MASTER_PORT=master_port, MASTER_USER='replication_user', MASTER_PASSWORD='replication_password', MASTER_LOG_FILE='master_log_file', MASTER_LOG_POS=master_log_pos;5
Start the slave replication.
START SLAVE;6
Verify replication status.
SHOW SLAVE STATUS\G3. Investigate and Fix Underlying Data Inconsistency advanced
Error 1596 often indicates a corruption or inconsistency in the data being replicated. This requires deeper investigation.
1
Examine the slave's error log for more detailed messages preceding or accompanying Error 1596. Look for specific table or row issues.
2
Compare the affected table(s) on the master and slave. You can use tools like `pt-table-checksum` from Percona Toolkit for a systematic comparison.
pt-table-checksum --host=<master_host> --user=<user> --password=<password> --databases=<database_name>3
If a specific row or record is causing the issue, identify it. You might need to manually correct the data on the slave or, if the master is the source of the corruption, on the master.
4
After correcting the data, stop and restart replication (as in Solution 1) or reconfigure the slave from a known good point (as in Solution 2).
4. Check for Schema Mismatches medium
A difference in table structures between the master and slave can lead to replication errors.
1
On both the master and slave servers, use `SHOW CREATE TABLE <table_name>;` to compare the schema of the table(s) involved in the replication error.
SHOW CREATE TABLE your_table_name;2
Look for any discrepancies in column definitions, indexes, constraints, or engine types.
3
If a schema mismatch is found, you will need to update the slave's schema to match the master. This might involve `ALTER TABLE` statements on the slave.
ALTER TABLE your_table_name ADD COLUMN new_column VARCHAR(255);4
Once the schema is synchronized, stop and restart replication.
STOP SLAVE;
START SLAVE;