#concurrency
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Why firstOrCreate Fails Under High Concurrency
The firstOrCreate method is not atomic; under load, concurrent requests can simultaneously verify a record's absence and both trigger a creation, resulting in duplicate data.
Optimizing Data Pipelines with Lock-Free Circular Buffers
High-frequency trading systems achieve nanosecond-level latency by replacing traditional thread synchronization with lock-free circular buffers to eliminate context switching and contention.
Defining the Coordination Boundary in Distributed Systems
Coordination libraries should strictly manage lease state and fencing, leaving external side effects, idempotency, and recovery logic to the application layer to avoid coupling and bloat.
Why Async Isn't Always Faster for Batch Jobs
Concurrency is not a universal performance fix. In CPU-bound or connection-heavy batch processing, the overhead of the event loop and increased database contention can make async code slower than simple thread-pooled synchronous code.
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