Apache Software Foundation Projects
Apache ASF
Data infrastructure specs (Parquet, Avro, Arrow) live under Apache — broader than the Parquet/Arrow entry alone.
What It Is
Catalog of 300+ Apache projects: Kafka, Spark, Hadoop, Cassandra, HTTP Server, Tomcat, and formal specs for Parquet, Arrow, Avro, Thrift.
Taxonomy
By category: Big Data · Web · Libraries · Incubator · Attic
Top-Level Categories
Master Catalog
Sub-Indexes & Guides
Open-source foundation publishing columnar and analytics file formats widely used in data pipelines: Apache Parquet (columnar storage) and Apache Arrow (in-memory columnar + IPC serialization). Specs are maintained on parquet.apache.org and arrow.apache.org.
View all bodies →Curated specs from Apache ASF
Parquet is the standard lakehouse/warehouse on-disk format (Spark, DuckDB, BigQuery export, Snowflake). Column chunk layout explains why analytics workloads beat row-oriented JSON/CSV.
Arrow is the interchange layer between Python/R/JVM analytics, DuckDB, and Parquet readers. IPC framing is how columnar data crosses process boundaries without JSON overhead.