Gunnar Morling • 6/25/2026

Hardwood 1.0: A Fast, Lightweight Apache Parquet Reader for the JVM

Hardwood 1.0 is a new open-source Apache Parquet library for the JVM, designed for high performance and minimal dependencies. It reads Parquet files with multi-threaded page decoding, supporting all column types, encodings, and compression schemes. Compatible with parquet-java, it targets Java 21+ and is available on Maven Central. The article covers its rationale, features, performance benchmarks, CLI tool, and future plans for write support.

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#performance #jvm #Java