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Idempotency keys, under load

Idempotency keys, under load

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4 min read
What Becomes True When Both Stay

What Becomes True When Both Stay

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4 min read
The Outbox Held, the Ledger Didn't

The Outbox Held, the Ledger Didn't

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4 min read
Git Worktrees for AI Agents

Git Worktrees for AI Agents

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3 min read
Race Condition on Concurrent Stock Updates

Race Condition on Concurrent Stock Updates

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6 min read
What Happens to the CPU Cache During sched_yield

What Happens to the CPU Cache During sched_yield

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6 min read
Reader-Writer Lock in Java: Solving the Library Problem in LLD

Reader-Writer Lock in Java: Solving the Library Problem in LLD

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2 min read
Colocate Adaptive Concurrency at the Bottleneck (2026)

Colocate Adaptive Concurrency at the Bottleneck (2026)

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4 min read
Go Goroutines vs Java Virtual Threads: Memory Models and Concurrency Overhead

Go Goroutines vs Java Virtual Threads: Memory Models and Concurrency Overhead

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3 min read
Stop Losing Chunk Context: Anthropic's Contextual Retrieval with Spring AI and Virtual Threads

Stop Losing Chunk Context: Anthropic's Contextual Retrieval with Spring AI and Virtual Threads

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2 min read
The Watchdog That Would Have Passed Every Test and Hung Anyway

The Watchdog That Would Have Passed Every Test and Hung Anyway

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7 min read
How Does a Database Let Everyone Read and Write at Once?

How Does a Database Let Everyone Read and Write at Once?

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19 min read
Our test runner had one core and the race needed two

Our test runner had one core and the race needed two

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2 min read
Java Concurrency LLD: Build a Custom BlockingQueue From Scratch

Java Concurrency LLD: Build a Custom BlockingQueue From Scratch

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2 min read
Stop Slamming Downstream Services: Singleflight Request Coalescing with Java Virtual Threads

Stop Slamming Downstream Services: Singleflight Request Coalescing with Java Virtual Threads

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2 min read
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