Error
Error Code:
1755
MySQL Error 1755: Parallel Replication Interrupted
Description
This error occurs when MySQL's multi-threaded replica (MTS) encounters an event in the relay log that prevents the current event group from being executed in parallel. It indicates a conflict with parallel processing, often due to consistency or safety constraints for specific replication events.
Error Message
Cannot execute the current event group in the parallel mode. Encountered event %s, relay-log name %s, position %s which prevents execution of this event group in parallel mode. Reason: %s.
Known Causes
4 known causesOperations on Non-Transactional Tables
Events involving non-transactional storage engines (e.g., MyISAM) cannot be safely parallelized by MTS due to the lack of transactional guarantees.
Schema Definition Language (DDL) Statements
DDL operations like ALTER TABLE or CREATE INDEX often require serialization to maintain data consistency across the replica, preventing parallel execution.
Specific Incompatible Event Types
Certain event types or complex inter-event dependencies might inherently prevent parallel execution for consistency, as determined by the replica's parallelization logic.
Transactions Spanning Multiple Databases
Transactions that affect multiple databases can introduce complexities that hinder their safe parallel execution on the replica.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service