MySQL Parallel Replication Deadlock

Potential Causes

1. Lock Contention: Multiple threads simultaneously requesting the same lock resource, causing threads to wait for each other.
2. Transaction Dependencies: Some transaction operations depend on the results of previous operations, leading to deadlocks if processed in the wrong order.
3. Resource Constraints: Insufficient system resources (such as CPU and memory) can prevent threads from completing operations in time, leading to deadlocks.

Solutions

1. Optimize Locking Strategy: Configure the granularity of locks reasonably to reduce contention. For example, use finer-grained locks or try to shorten the lock holding time.
2. Adjust Parallel Replication Parameters: Adjust Parallel Replication parameters based on actual conditions, such as slave_parallel_type and slave_parallel_workers, to optimize Parallel Replication performance.
3. Monitor and Adjust: Continuously monitor system resource usage and transaction progress, making timely adjustments to avoid resource contention and deadlocks.
4. Transaction Isolation Levels: Choose appropriate transaction isolation levels based on business needs to reduce dependencies and lock contention between transactions.