Delta Lake: Turn your Data Lake into a Lakehouse
summary
Delta Lake is presented as an open‑source protocol that adds ACID guarantees and warehouse features onto parquet files stored in a data lake, with co‑located _delta_log JSON files recording every transaction (adds/removes, stats for file skipping). Demo uses a Kaggle Stack Overflow set (~3.3 million rows, 3.7 GB) to show MERGE/upsert behavior, schema evolution and constraints, time travel by version or timestamp, Change Data Feed for CDC, and mentions OPTIMIZE/ZORDER/VACUUM and Delta Lake 2.0 experimental.
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