**Why it matters**: At scale, design choices directly impact reliability, latency, and cost. Wrong decisions compound across jobs and teams.
Fetch API → DataFrame: Use `requests` or `urllib` to call API, parse JSON, create RDD/DataFrame. Example: `import requests; r = requests.get(url); data = r.json(); df = spark.createDataFrame(data['results'])`. For pagination: loop with `next_page`; collect pages; concatenate. For large APIs: use async, batch, or streaming....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Warner Bros Discovery. The answer also includes follow-up discussion points that interviewers commonly explore.
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