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apache / orc / 3e14b7c5816dd3255e28f9d22ed32134a6e32f5d
commit3e14b7c5816dd3255e28f9d22ed32134a6e32f5d[log] [tgz]
authorDhruve Ashar <dashar@yahoo-inc.com>Wed Mar 06 17:48:11 2019 -0600
committerOwen O'Malley <omalley@apache.org>Mon Mar 11 09:10:31 2019 -0700
treed47e57ffb8d77bdf02f708ebb7d5626dc5daad36
parent6e549836b5b2aac1bd258ed3409ffbc1710a8bc8 [diff]
ORC-476: Make SearchAgument kryo buffer size configurable

Fixes #372

Signed-off-by: Owen O'Malley <omalley@apache.org>
2 files changed
tree: d47e57ffb8d77bdf02f708ebb7d5626dc5daad36
  1. c++/
  2. docker/
  3. examples/
  4. java/
  5. proto/
  6. site/
  7. tools/
  8. .gitignore
  9. .travis.yml
  10. CMakeLists.txt
  11. LICENSE
  12. NOTICE
  13. README.md
README.md

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 for reading and writing and a C++ library for reading 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.

The current build status:

  • Master branch master build status
  • Pull Requests

The subdirectories are:

  • c++ - the c++ reader
  • 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