27 real Hudi & Open Tables questions from the Big Data bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Copy-on-write table?
Junior
A.a Hudi index that maps each record key to its file location so upserts find existing records quickly
B.a Hudi operation that rewrites and sorts data to improve layout and query pruning without changing record values
C.a Hudi table type that rewrites columnar files on each update, optimizing read performance at the cost of write amplification
D.a Hudi read mode that returns only records changed after a given commit time, enabling efficient downstream pipelines
A.Copy-on-write table — a metadata layer over data files that adds ACID transactions, time travel, and schema evolution to object storage, as in Iceberg, Delta, and Hudi
B.Copy-on-write table — the Hudi 1.0 redesign storing the timeline as a log-structured merge tree so it scales to very long histories
C.Copy-on-write table — a Hudi table type that rewrites columnar files on each update, optimizing read performance at the cost of write amplification
D.Copy-on-write table — a Hudi operation that rewrites and sorts data to improve layout and query pruning without changing record values
A.Merge-on-read table — a metadata layer over data files that adds ACID transactions, time travel, and schema evolution to object storage, as in Iceberg, Delta, and Hudi
B.Merge-on-read table — the Hudi process that merges merge-on-read log files into base columnar files to keep read performance high
C.Merge-on-read table — a Hudi table type that writes updates to row-based log files and merges them with base files during reads or compaction
D.Merge-on-read table — a Hudi index that maps each record key to its file location so upserts find existing records quickly
A.LSM timeline — a metadata layer over data files that adds ACID transactions, time travel, and schema evolution to object storage, as in Iceberg, Delta, and Hudi
B.LSM timeline — a Hudi table type that rewrites columnar files on each update, optimizing read performance at the cost of write amplification
C.LSM timeline — the Hudi 1.0 redesign storing the timeline as a log-structured merge tree so it scales to very long histories
D.LSM timeline — a Hudi operation that rewrites and sorts data to improve layout and query pruning without changing record values
26. Which term means: "a metadata layer over data files that adds ACID transactions, time travel, and schema evolution to object storage, as in Iceberg, Delta, and Hudi"?
A.Open table format — a metadata layer over data files that adds ACID transactions, time travel, and schema evolution to object storage, as in Iceberg, Delta, and Hudi
B.Open table format — the Hudi process that merges merge-on-read log files into base columnar files to keep read performance high
C.Open table format — a Hudi table type that rewrites columnar files on each update, optimizing read performance at the cost of write amplification
D.Open table format — a Hudi index that maps each record key to its file location so upserts find existing records quickly
Answers, AI explanations, and a scored voice mock interview
Sign up free to check your answers with explanations, ask the AI tutor anything on any question, and take one full AI mock interview — scored like a real panel.