Akubra Project

Introduction

The Akubra Project is a new effort to provide a pluggable file storage interface that can be adapted to almost any storage subsystem. Akubra supports both ordinary and transactional storage systems, but makes simplifying assumptions in order to achieve a high level of interoperability between storage systems:

In Akubra:

• a Blob is a finite-length bitstream with an id (a URI)
• a Blob Store is primarily concerned with providing read/write access to blobs.

News

• March 13th, 2010 - Akubra 0.3 released.  This release has no core API changes, but several important improvements:
  • The core Akubra jars are now available in Maven Central
  • All jars are now compiled for Java 6 (Java 5 has reached its End of Service Life)
  • All jars now include OSGi metadata
  • Logging is now done via SLF4J (was commons-logging)
  • The JTA dependency is now to version 1.1 (was previously 1.0.1B)
• November 27th, 2009 - Akubra 0.2 released.  This release:
  • Uses the latest version of Derby for the akubra-txn implementation
  • Repackages the Akubra classes under org.akubraproject
• April 30th, 2009 - Akubra 0.1 released.

Downloads

• Core API

  • akubra-core-0.3.jar - The Core Akubra API [javadocs]

• Base Implementations

  • akubra-fs-0.3.jar - Simple filesystem implementation (non-transactional) [javadocs]

  • akubra-mem-0.3.jar - In-memory implementation (non-transactional) [javadocs]

  • akubra-www-0.3.jar - Web implementation (non-transactional, read-only) [javadocs]

• Layering Implementations

  • akubra-map-0.3.jar- Wraps an existing BlobStore to provide a blob id mapping layer [javadocs]

  • akubra-mux-0.3.jar - Provides a unified view over any number of backing stores [javadocs]

  • akubra-qsc-0.3.jar - Provides quiescing capability to a BlobStore [javadocs]

  • akubra-rmi-0.3.jar - Allows a BlobStore to be exposed and accessed remotely, via RMI [javadocs]

  • akubra-txn-0.3.jar - Uses Derby to provide transactional capabilities over a non-transactional store [javadocs]

• Utilities

  • akubra-tck-0.3.jar - Technology Compatibility Kit for Akubra implementations [javadocs]

Known Third-Party Implementations

• akubra-caringo - Concrete implementation for the Dell DX Object Storage Platform
• akubra-hdfs - Concrete implementation for Hadoop filesystems
• akubra-bhle - Multiplexing implementation with short-term and long-term underlying stores
• irods-akubra - (TBD) IRODS implementation

Documentation

• Requirements and Goals
• Analysis of Existing Approaches
• Latest API Documentation (Javadocs)
• Latest Maven Site

Community

We invite you browse our mailing lists, or subscribe and join the conversation:

• Akubra Users [subscribe via google or via email | view ]
  General information, questions, release announcements, etc.

• Akubra Developers [subscribe via google or via email | view | original list archive ]
  Discussions pertaining the development of Akubra.

• Akubra Codewatch [subscribe via google or via email | view ]
  Intended for developers, this read-only list provides automatic notification of commits to the source code repository.

Source Code

The source source repository is hosted at github:

• Browse: https://github.com/akubra/akubra
• Anonymous Clone: git clone git://github.com/akubra/akubra.git
• Committer Clone: git clone git@github.com:akubra/akubra.git

Note: You will need JDK 1.6+ and maven to build.

Coding conventions for this project are currently documented here (TODO:migrate here).

Issue Tracking

Bugs and features for this project will be tracked here.