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Concept questionHard~15 min

How do Celery acknowledgements affect task loss and redelivery?

Explains early and late acknowledgement without promising exactly-once task execution.

Architecture scenarioHard~15 min

How do Celery concurrency and prefetch affect throughput and fairness?

Tunes worker pools and reservation behavior to task shape instead of maximizing a single concurrency number.

Python

Practice drill

Concept questionMedium~10 min

How do timeout, KEY_PREFIX, and VERSION shape Django cache behavior?

Uses Django cache configuration to control freshness, namespace sharing, and safe cache migrations.

Architecture scenarioHard~15 min

How do you run Celery periodic tasks without duplicate scheduling or unsafe overlap?

Separates single scheduler ownership from task-level overlap and idempotency controls.

Architecture scenarioHard~15 min

How do you stop an old background task from overwriting newer state?

Uses expected versions and conditional writes so delayed or retried Python tasks cannot commit stale decisions.

Architecture scenarioHard~15 min

How should a Python service manage redis-py clients and connection pools?

Reuses bounded redis-py pools for the application lifetime and closes async resources deliberately.

Architecture scenarioHard~15 min

How should you design and version Celery task arguments?

Keeps Celery messages small, safe to deserialize, and compatible across rolling deployments.

Architecture scenarioHard~15 min

How would you design safe retries for a Celery task?

Combines selective Celery retries with bounded backoff, idempotent effects, and a terminal failure path.

Comparison questionHard~15 min

What is the difference between Redis pipelines, transactions, and Lua scripts in redis-py?

Distinguishes fewer network round trips from atomic execution and chooses the smallest correct Redis primitive.

Comparison questionMedium~10 min

When are FastAPI BackgroundTasks appropriate, and when do you need a real task queue?

Chooses between small in-process follow-up work and durable, independently operated background execution.