python
17 minPython Async Runtime Advanced: GIL, ASGI Lifecycles, and Safe Concurrency
Understand event-loop scheduling, CPU versus I/O concurrency, ASGI worker lifecycles, per-request sessions, and cancellation-safe background work.
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28 matching resultsArticles and interview answers
python
8 minFastAPI Async Patterns: When to Use Background Tasks vs Real Concurrency
FastAPI is fast, but speed is not the same as correctness. Learn where async, background jobs, and bounded concurrency matter in Python services.
python
9 minDebugging Flaky Python Tests: Time, State, Concurrency, and Isolation
Find the hidden shared state, clock assumptions, race, or nondeterministic dependency behind tests that fail only sometimes.
java
18 minAdvanced Java and Spring: Runtime, Concurrency, Proxies, and Reactive Failure Modes
A production field guide to GC choice, thread-pool saturation, Spring lifecycle traps, AOP boundaries, and blocking work in reactive services.
Q&A
Q&AHow do you prevent an async API from overwhelming dependencies?
Bound concurrency and queue depth at the scarce resource, and enforce an end-to-end deadline.
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Use bounded connection pools, semaphores or worker queues, request deadlines, and deliberate overload responses. Local limits must account for replica count because each replica has its own pool. Avoid unbounded in-memory tasks and retries that amplify load during an incident.
typescript
5 minNode.js Foundations: Event Loop Work, Backpressure, and Cancellation
Keep request handlers responsive by distinguishing asynchronous waiting from CPU work, bounding concurrency, and propagating stream failures.
databases
10 minPostgreSQL MVCC and Indexes: Reads, Vacuum, and Query Plans
Connect PostgreSQL's multi-version concurrency control to transaction visibility, vacuum work, index choice, and EXPLAIN output.
python
8 minFastAPI Backpressure: Protecting Your Service from Unbounded Fan-Out
A practical guide to request concurrency, connection pools, timeouts, and overload behavior in async Python APIs.