How would you explain Streams and Backpressure to a junior engineer?

Answers use simple, clear English.

Quick interview answer

Explain Streams and Backpressure in one sentence, then a tiny example, then one “don’t do this” tip. Baseline: Readable pushes data; Writable signals backpressure when internal buffer exceeds highWaterMark. Respect drain event before resuming writes to avoid memory blowup.

Detailed answer

Junior-friendly explanation of Streams and Backpressure: Plain English: Baseline: Readable pushes data; Writable signals backpressure when internal buffer exceeds highWaterMark. Respect drain event before resuming writes to avoid memory blowup. Tiny example: ETL job pipes HTTP download → gzip transform → S3 upload without loading entire file into RAM. One warning: Ignoring write() return false; not awaiting 'drain' on backpressure.

Full explanation

Keep jargon low, then layer detail. Readable pushes data; Writable signals backpressure when internal buffer exceeds highWaterMark. Respect drain event before resuming writes to avoid memory blowup.

Follow-up questions

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Parent context — Streams and Backpressure

Baseline: Readable pushes data; Writable signals backpressure when internal buffer exceeds highWaterMark. Respect drain event before resuming writes to avoid memory blowup.

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