Apache Hudi Delta

Apache Hudi (Hadoop Upserts Delta Increments) is a framework that brings ACID transactions and incremental processing to data lakes. While traditional data lakes (Parquet files on S3) are append-only, Hudi supports upserts, deletes, and time-travel queries. Hudi operates on two table types: Copy-on-Write (faster reads) and Merge-on-Read (faster writes). Both guarantee consistency while enabling the operational patterns of traditional databases.