# apache/parquet-java

Apache Parquet Java

Repository: https://github.com/apache/parquet-java
Canonical: https://ross.abutalabs.com/products/parquet-java
Homepage: https://parquet.apache.org/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: parquet, apache, parquet-java
Last push: 2026-08-25T19:04:21+00:00

## Health v2 (maintenance only)
Score: 90/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 73, longevity 100
- inputs: {"age_days": 4467, "days_push": 8, "days_rel": 22, "gap_med": 96.0, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3076, forks 1566 (observed 2026-08-28T04:07:41.740110+00:00)

## What it is
Apache Parquet Java is the Java implementation of the Apache Parquet column-oriented data file format. It provides reading and writing of efficient, compressed columnar files with support for nested data via the Dremel record shredding and assembly algorithm.

## Use cases
- read and write parquet files in Java
- convert JSON or CSV data to columnar parquet format
- store large analytical datasets with efficient compression
- query column chunks with predicate pushdown using column statistics
- integrate parquet support into a Hadoop or Spark pipeline
- handle nested and semi-structured data in a columnar file format

## When to choose
- you are building a JVM-based data pipeline that needs parquet I/O
- you need efficient columnar storage with compression and encoding for bulk data
- you want a mature, Apache Software Foundation maintained implementation of the parquet format

## When to avoid
- you need parquet support in Python, Rust, or another non-JVM language
- you only need a simple row-oriented file format like CSV or JSON
- your project cannot use Java 17 or higher

## Facets
- artifact type: library
- maturity: active
- function: serialization, file-system, compression
- domain: big-data, files, analytics
- platform: jvm, cross-platform
- tags: parquet, columnar-format, hadoop, data-lake, avro, data-engineering

## Member repositories
- apache/parquet-java (main) score 90

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:41.740110+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:27:54.727205+00:00, confidence not recorded.
  - readme: https://github.com/apache/parquet-java (fetched 2026-08-28T04:07:41.740110+00:00, sha b4e26ee09c5a)
  - homepage: https://parquet.apache.org/ (fetched 2026-08-29T09:43:10.042364+00:00, sha 5d7913adb12e)
  - site_page: https://parquet.apache.org/docs (fetched 2026-08-29T09:43:10.051159+00:00, sha ffd29d8c787e)
  - site_page: https://parquet.apache.org/blog (fetched 2026-08-29T09:43:10.053023+00:00, sha 062c8b637316)
- Data as of 2026-08-30T08:39:29.467469+00:00.