Spark Data Source API, step by step (CoinGecko)
Step‑by‑step guide: from a batch approach to a real streaming Data Source in PySpark 3.5.1. Defines schema, offsets, reader, and provider registration to use format("coingecko").
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What Delta stores on disk
Explore the on‑disk layout, commits, and checkpoints, and see why it matters for performance, maintenance, and troubleshooting in production.