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What are the advantages of using Delta Lake over Parquet?

Spark/Big Dataeasy0.5 min readPremium
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Asked at 1 company
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Puma
Expert AnswerPremium
103 wordsInterview-ready
**Why Delta Over Raw Parquet**: Parquet is immutable; no deletes, no transactional writes. Concurrent writers create corrupt state. Delta adds transaction log and metadata. **Delta Advantages**: (1) **ACID**—concurrent writes; readers see consistent snapshot. (2) **Time travel**—versionAsOf, timestampAsOf for audits and rollback. (3) **MERGE/UPDATE/DELETE**—CDC, upserts without overwrite. (4) **Schema enforcement/evolution**—reject bad data; add columns safely....
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