Dares

Distributed Heterogeneous Dynamic Quorum-based Data Replication

Dares is a proof-of-concept implementation of a distributed heterogeneous dynamic quorum-based data replication scheme. The theoretical foundations are described in Storm 2012.

We presented Dares at the 13th MNUG meet-up. A video of the talk can be found here.

Getting started

Install

List Dares in your package.json:

"dares": "~0.0.2",

and run

npm install

to install it as a dependency.

Initialization

After installing you will be able to use Dares.js by

  var Dares = require( 'dares' );
  var instance = new Dares( id, port, options );
  instance.start( callback )
  

with the following parameters:

• id an integer id which has to be unique in the system
• port port to receive messages from other nodes
• options an object setting the options for Dares. See the defaults.js file for possible options.
• callback a function to be called when the setup is complete leave empty to start a new distributed system

After callback was called, the new node is ready to be used.

Writing

instance.write( key, value, callback );

• key valid json-key to write to
• value value to write for this key
• callback function which gets called when the write is completed.

Writes the key value pair to the distributed system.
callback gets called either with callback( true ) when the write was successful and callback( false, error ) in case of an unsuccessful write.

Reading

 instance.read( key, callback );

• key valid json-key to read
• callback function which gets called when the read is completed.

Reads a key from the distributed system.
callback gets called either with callback( true, value ) with value being the read value when the write was successful or callback( false, error ) in case of an unsuccessful write.

Contributing

To contribute, clone the repository

git clone ssh://github.com/TNG/Dares.git

install the dependencies

npm install

and run

grunt

to see a list of all available tasks. Run

grunt docker

to generate the documentation files.

License

Dares is released under the Apache License, Version 2.0.