File formats & storage interview questions for data engineers
Parquet, Avro, ORC, Delta/Iceberg/Hudi, partitioning, and small files. 28 questions with full answers, written for freshers. All topics
Formats & Table Formats (3)
Performance & Layout (1)
Parquet Internals (6)
Table Formats in Depth (13)
- How a table format adds ACID to files
- Delta transaction log
- Iceberg metadata tree
- Iceberg hidden partitioning and partition evolution
- Copy-on-write vs merge-on-read
- Deletion vectors
- Iceberg format v3
- Iceberg catalogs and the REST catalog
- Concurrent writers on a table format
- Snapshot expiration and orphan files
- Delta change data feed
- Liquid clustering
- Delta Lake UniForm and format interoperability