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Revision as of 19:18, 21 August 2013 by Kgriffs (talk | contribs) (Detailed Description)

Project Codename



Marconi is a messaging and notifications queue for the OpenStack product portfolio, supporting both producer-consumer and publish-subscribe modes. Marconi is designed to perform and scale in a multi-tenant environment.

Detailed Description

As the OpenStack product line grows, the need for a messaging and notification service is growing in order to support more complex, distributed application architectures. Marconi is designed to run on Nova servers, behind OpenStack load balancers, and in coordination with Keystone auth.

Marconi is a foundational cloud messaging service that can be used directly, or in support of a higher level service such as a workflow manager. Marconi provides an interface for creating queues, posting messages to those queues, and claiming those messages for processing. It also provides an interface for clients to list messages without needing to claim them, in order to support pub-sub and passive auditing of producer-consumer workflows. The service will guarantee first in, first out (FIFO) order for single producer models.

The Marconi architecture is pluggable in terms of both transport and storage. Reference drivers for HTTP (WSGI), SQLAlchemy, and MongoDB will be provided, along with a SQLite driver to facilitate development and testing. Other transport and storage drivers have been proposed, and are currently under discussion. Marconi deployments will support HA, and will scale horizontally in order to support large public cloud deployments. Operators will be able to scale Marconi deployments using any combination of:

  • Using a stateless transport layer such as HTTP
  • Using a storage driver that can supports backends which at least scale-out reads
  • Partitioning deployments into independent clusters and introducing a routing proxy which balances queues across the partitions

The Marconi API exposes the following calls:


Create Queue
List Queues
Set Queue Metadata
Get Queue Metadata
Get Queue Stats
Delete Queue


Post Message(s)
Get Messages
Get a Specific Message
Claim Messages


Query Claim
Update Claim
Release Claim

Basic roadmap for the project

Version 1.0

  • REST API for queue/messages/claim management
  • Multi-tenant
  • Integrated with Keystone for authentication
  • Command Line Interface
  • Python Bindings
  • Error handling, edge cases
  • Ruggedization/packaging for production deployments
  • Operator Documentation
  • Performance Tuning
  • Bulk message deletion
  • Unit & Functional Tests

Future Release Plans

  • Non-Python language bindings
  • Add Functional, Load & Security tests to a CI pipeline
  • Message Compression
  • MySQL Support
  • Kombu Integration
  • Message tags

Location of project source code

Marconi at StackForge


Programming language, required technology dependencies

Language: Python

Dependencies: Falcon, MongoDB, Oslo, Stevedore

Is project currently open sourced? What license?

Yes, under the Apache 2.0 license.

Level of maturity of software and team

The Marconi project has been under active development at both Rackspace and Red Hat since January of 2013 and recently reached a level of maturity that will support production work loads. The current code base contains numerous unit and functional tests. A comprehensive load and security test suite is currently under development. The Marconi team is ramping up on client library development, and will be incubating the common OpenStack API library as part of the project.

Proposed project technical lead and qualifications

Kurt Griffiths is a Principal Architect at Rackspace Hosting, currently working with other technical leaders inside and outside the company on cloud architecture, strategy and evangelism. Kurt focuses on web service APIs, agents, cryptography, and performance. He works with other senior technologists to provide day-to-day and long-term technical guidance for products developed at Rackspace.

Other project developers and qualifications

Current Code Contributors

  • Flavio Percoco is a Software Engineer at Red Hat. Active in the OpenStack community, Flavio has contributed and reviewed code on OpenStack’s Block Storage, Image, Oslo, and Stable Maintainers teams.
  • Malini Kamalambalis a Quality Engineer at Rackspace, with over 11 years of industry experience. In addition to test planning and functional execution, Malini has history in software development.
  • Oz Akan is a Cloud Engineering Manager at Rackspace and has been working in technology since 1997. Oz is an expert in database management, having spent time working with MySQL, Oracle, and Mongo DB.
  • Allan Metts is the Director of Engineering for the Rackspace Atlanta office, which is the site responsible for the company's Cloud Backup, Jungle Disk, and Cloud Queuing products. Prior to Rackspace, Allan led the development of several large-scale systems in the telecommunications, transportation, and financial sectors. He specializes in distributed systems that crunch large amounts of data at high rates of speed.
  • Victoria Martínez de la Cruz is a Licenciate in Computer Science student and one of the interns of GNOME OPW for OpenStack.
  • Zhihao Yuan is a Software Developer at Rackspace, and a member of the Technical Leadership Team. Zihihao has experience with FreeBSD, C++, Python, and more.
  • Alejandro Cabrera is a software developer at Rackspace. His expertise include: Python, Linux, open-source, community building, distributed systems, and automation.

Previous Code Contributors

  • Jamie Painter is a Software Manager at Rackspace, as well as a member of Rackspace's Technical Leadership Team. He specializes in architecture/design, C/C++, Python, Linux, shell scripting, encryption and security.
  • Bryan Davidson is a Software Developer at Rackspace. He has over 5 years of industry experience building web-scale applications.

API Design Contributors (no code submitted)

  • John Hopper is a Software Develop at Rackspace and has over 11 years of industry experience. John specializes in tackling large, complex models and prototyping solutions.
  • Hong Yuan is a Senior Software Engineer at HP, working on projects such as Messaging as a Service and Database as a Service. Hong specializes in software architecture and development with high scalability, high availability, and low latency.
  • Travis Reeder is the a Co-Founder and CTO at Iron.io. Travis specializes in building highly scalable applications, Go (golang), Ruby on Rails, and Java.

Infrastructure requirements (testing, etc)

Currently on StackForge using Gerrit and Jenkins to run the unit test suite and flake8. A QA cluster is nearing completion which will facilitate automated load and security testing, with infrastructure donated by Rackspace. The QA cluster will serve as a reference configuration for operators wishing to deploy a Marconi cluster. No additional infrastructure requirements are expected.

Have all current contributors agreed to the OpenStack CLA?


Related Links

Marconi Documentation

Project Home


Pending Incubation