Some basic README docs
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Standalone version of Usergrid's Qakka queue service.

Introducting Qakka

Qakka is a standalone version of the distributed and multi-region queue system that it built-into Apache Usergrid. It is a Java web application that combines the Usergrid Actor System and Queue modules with a Jersey JAX-RS based REST API.

Qakka Features

  • Multiple named Queues
  • Distributed and Multi-region
    • Queue messages can be sent to multiple regions
    • Queue reads always from local region
  • Inflight Queue messages time-out if not “acked”
  • Schemaless Queue message payloads, JSON or BLOB with any content-type
  • REST & Java APIs

Qakka System Requirements

Minimal requires for Qakka in one region or data center are:

  • One or more computers running Java 8 and Tomcat 7 or 8
  • A Cassandra cluster running Cassandra 2.1.x

Qakka Internals

You can learn more about Qakka internals by reading this Google Slides presentation.

Qakka was developed as for this JIRA Issue: USERGRID-1318.

Qakka Installation

We don‘t have installation documentation or scripts yet, but here’s an overview of what you'll have to do to setup Qakka:

  • In each region, setup your Tomcat computers

    • Install Java 8
    • Install Tomcat 7 or 8
    • Place the WAR file in the Tomcat's webapps directory
    • Place your file in your Tomcat lib directory
    • If you more than one Tomcat, you probably want to add a Load Balancer, e.g. AWS ELB
  • In each region, setup your Cassandra computers

    • Install Java 8
    • Install Cassandra 2.1.x
    • Verify that your cluster is working

There is an example file that contains some information about how to configure Qakka, its Cassandra connections and its Usergrid Clustering.