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RESTful Message Queue

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Read the full documentation at http://queuey.readthedocs.org/

Wat? Another message queue?

Given the proliferation of message queue’s, one could be inclined to believe that inventing more is not the answer. Using an existing solution was attempted multiple times with most every existing message queue product.

The others failed (for our use-cases).

Queuey is meant to handle some unique conditions that most other message queue solutions either don’t handle, or handle very poorly. Many of them for example are written for queues or pub/sub situations that don’t require possibly longer term (multiple days) storage of not just many messages but huge quantities of queues.

Queuey Assumptions and Features:

  • Messages may persist for upwards of 3 days
  • Range scans with timestamps to rewind and re-read messages in a queue
  • Millions of queues may be created
  • Message delivery characteristics need to be tweakable based on the specific cost-benefit for a Queuey deployment
  • HTTP API for easy access by a variety of clients, including AJAX
  • Authentication system to support multiple ‘Application’ access to Queuey with optional Browser-ID client authentication
  • A single deployment may support multiple Applications with varying message delivery characteristics, and authentication restricted queue access

Queuey can be configured with varying message guarantees, such as:

  • Deliver once, and exactly once
  • Deliver at least once (and under rare conditions, maybe more)
  • Deliver no more than once (and under rare conditions, possibly not deliver)

Changing the storage back-end and deployment strategies directly affects the message guarantee’s. This enables the Queuey deployment to meet different requirements and performance thresholds.

For more background on Queuey, see the Mozilla wiki section on queuey.

Requirements

Make sure you have the following software already installed before proceeding:

  • Java 1.6
  • Ant
  • Make
  • Python 2.7 (with virtualenv installed)

Installation

After downloading the repository for the first time, cd into the directory and run:

$ make

This will do the following:

  • Create a virtual python environment
  • Install required python packages into this environment

Cassandra

To run Queuey, you need a storage back-end for the queues. The default storage back-end is Cassandra. This installation has been automated in Queuey’s Makefile, to install Cassandra in the same directory as Queuey:

make cassandra

Which will fetch the Cassandra server and set up the configuration.

The default (Cassandra) stores its data and files inside the local Cassandra directory so as not to interfere with any existing Cassandra installations on the system.

Running

Running the Cassandra Server:

The message store (used by the server to route messages) and the HTTP server must be started separately. The steps are (starting from the root project directory)

./bin/cassandra/bin/cassandra -p cassandra.pid

To shut it down at any point in the future:

kill -2 `cat cassandra.pid`

Running the Queuey Application:

It is recommended that you copy the etc/queuey-dev.ini file to /etc/queuey.ini. This will prevent accidental loss of configuration during an update.

bin/pserve etc/queuey.ini

Troubleshooting:

“Upgrading” Queuey may require reinitializing the schema. To reinitialize the schema, remove all data files. The new correct schema will be automatically created during the next Queuey startup.

  1. Stop Cassandra:

    kill -2 `cat cassandra.pid`
    
  2. Remove the Cassandra data directory (not the Cassandra binary directory):

    rm -rf ./cassandra
    
  3. Start Cassandra:

    ./bin/cassandra/bin/cassandra -p cassandra.pid
    

Changelog

0.8 (2012-08-28)

Features

  • Compatibility with Cassandra 1.1
  • Add new API’s to get, post and update messages by their message id
  • Add new memory storage backend for testing purposes.
  • Add metlog based metrics logging.
  • Use pycassa’s system manager support to programmatically create the Cassandra schema during startup.

Bug fixes

  • Fix precision errors in server side message id to timestamp conversion.
  • Enforce message keys to be valid UUID1 instead of just any UUID.

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