AI BriefingHow Trying to Resolve Deadlocks Led to Reducing Locks
Key point
This article outlines the process of redesigning the pessimistic lock strategy to prevent deadlocks during Kafka event processing.
Details
In the new user reward event system, the lock strategy was adjusted to resolve concurrency issues caused by Kafka's At-Least-Once characteristic and topic separation problems.
Initially, a Pessimistic Lock at the user level was applied, but the INSERT ... ON DUPLICATE KEY UPDATE approach caused unnecessary write costs and Hot Row issues.
To improve this, it was changed to INSERT IGNORE, but unexpected deadlocks occurred. The issue was resolved by analyzing deadlock logs to re-examine the lock acquisition order and transaction structure.
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