node-hash-ring - Consistent Hashing C++ Add-on for node.js
See this blog post for more information.
Installation
Via npm:
$ npm install hash_ringVia git:
$ git clone http://github.com/bnoguchi/node-hash-ring.git
$ cd node-hash-ring
$ npm run buildExample
var HashRing = require("hash_ring");
// Create a cluster of 3 servers weighted so that 127.0.0.2:8080 stores twice as many
// keys as 127.0.0.1:8080, and 127.0.0.3:8080 stores 4x as many keys as 127.0.0.1:8080
// and 2x as many keys as 127.0.0.2:8080
var ring = new HashRing({"127.0.0.1:8080": 1, "127.0.0.2:8080": 2, "127.0.0.3:8080":4});
console.log(ring.getNode("users:102") ); // Should be 127.0.0.3:8080See ./test/test_distribution.js for another example:
$ node test/test_distribution.jsKey Hashing
By default, MD5 is used to hash keys. You can choose another hasher.
var HashRing = require("hash_ring");
var ring = new HashRing({"127.0.0.1:8080": 1, "127.0.0.2:8080": 2, "127.0.0.3:8080":4}, "murmur");Supported hashers are:
md5- the defaultmurmur- MurmurHash3
Tests
To run the tests:
$ npm testLicense
MIT License
Author
Brian Noguchi