Apache Orc

Clone this repo:
  1. f258853 Add post for ORC 1.4.5 and Dongjoon joining the PMC. by Owen O'Malley · 52 minutes ago master
  2. 35cea8d ORC-576: Improve the license file for third party code. by Owen O'Malley · 3 days ago
  3. c210565 ORC-574: Use const references for string statistics. by david.zanter · 5 days ago
  4. 949c744 ORC-27: Add support for proleptic Gregorian calendar for better support of by Owen O'Malley · 13 days ago
  5. 1713266 Fixing travis. by Owen O'Malley · 6 days ago

Apache ORC

ORC is a self-describing type-aware columnar file format designed for Hadoop workloads. It is optimized for large streaming reads, but with integrated support for finding required rows quickly. Storing data in a columnar format lets the reader read, decompress, and process only the values that are required for the current query. Because ORC files are type-aware, the writer chooses the most appropriate encoding for the type and builds an internal index as the file is written. Predicate pushdown uses those indexes to determine which stripes in a file need to be read for a particular query and the row indexes can narrow the search to a particular set of 10,000 rows. ORC supports the complete set of types in Hive, including the complex types: structs, lists, maps, and unions.

ORC File Library

This project includes both a Java library and a C++ library for reading and writing the Optimized Row Columnar (ORC) file format. The C++ and Java libraries are completely independent of each other and will each read all versions of ORC files. But the C++ library only writes the original (Hive 0.11) version of ORC files, and will be extended in the future.

Releases:

  • Latest: Apache ORC releases
  • Maven Central: Maven Central
  • Downloads: Apache ORC downloads

The current build status:

  • Master branch master build status
  • Pull Requests

Bug tracking: Apache Jira

The subdirectories are:

  • c++ - the c++ reader and writer
  • docker - docker scripts to build and test on various linuxes
  • examples - various ORC example files that are used to test compatibility
  • java - the java reader and writer
  • proto - the protocol buffer definition for the ORC metadata
  • site - the website and documentation
  • tools - the c++ tools for reading and inspecting ORC files

Building

  • Install java 1.7 or higher
  • Install maven 3 or higher
  • Install cmake

To build a release version with debug information:

% mkdir build
% cd build
% cmake ..
% make package
% make test-out

To build a debug version:

% mkdir build
% cd build
% cmake .. -DCMAKE_BUILD_TYPE=DEBUG
% make package
% make test-out

To build a release version without debug information:

% mkdir build
% cd build
% cmake .. -DCMAKE_BUILD_TYPE=RELEASE
% make package
% make test-out

To build only the Java library:

% cd java
% mvn package

To build only the C++ library:

% mkdir build
% cd build
% cmake .. -DBUILD_JAVA=OFF
% make package
% make test-out