The Apache Arrow Java modules implement various specifications including the columnar format and IPC. Most modules are native Java implementations, but some modules are JNI bindings to the C++ library.
| Module | Description | Implementation |
|---|---|---|
| arrow-format | Generated Java files from the IPC Flatbuffer definitions. | Native |
| arrow-memory-core | Core off-heap memory management libraries for Arrow ValueVectors. | Native |
| arrow-memory-unsafe | Memory management implementation based on sun.misc.Unsafe. | Native |
| arrow-memory-netty | Memory management implementation based on Netty. | Native |
| arrow-vector | An off-heap reference implementation for Arrow columnar data format. | Native |
| arrow-tools | Java applications for working with Arrow ValueVectors. | Native |
| arrow-jdbc | (Experimental) A library for converting JDBC data to Arrow data. | Native |
| flight-core | An RPC mechanism for transferring ValueVectors. | Native |
| flight-sql | Contains utility classes to expose Flight SQL semantics for clients and servers over Arrow Flight. | Native |
| flight-integration-tests | Integration tests for Flight RPC. | Native |
| arrow-performance | JMH benchmarks for the Arrow libraries. | Native |
| arrow-algorithm | (Experimental) A collection of algorithms for working with ValueVectors. | Native |
| arrow-avro | (Experimental) A library for converting Avro data to Arrow data. | Native |
| arrow-compression | (Experimental) A library for working with compression/decompression of Arrow data. | Native |
| arrow-c-data | Java implementation of C Data Interface | JNI |
| arrow-orc | (Experimental) A JNI wrapper for the C++ ORC reader implementation. | JNI |
| arrow-gandiva | Java wrappers around the native Gandiva SQL expression compiler. | JNI |
| arrow-dataset | Java bindings to the Arrow Datasets library. | JNI |
Arrow Java modules support working with data (1) in-memory, (2) at rest, and (3) on-the-wire.