https://github.com/bnoguchi/node-hash-ring

A Consistent Hashing C++ add-on for node.js
https://github.com/bnoguchi/node-hash-ring

Last synced: 6 days ago
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A Consistent Hashing C++ add-on for node.js

• Host: GitHub
• URL: https://github.com/bnoguchi/node-hash-ring
• Owner: bnoguchi
• Created: 2010-08-24T00:20:52.000Z (about 14 years ago)
• Default Branch: master
• Last Pushed: 2021-10-12T10:51:16.000Z (about 3 years ago)
• Last Synced: 2024-10-12T00:14:29.154Z (about 1 month ago)
• Language: C++
• Homepage:
• Size: 38.1 KB
• Stars: 139
• Watchers: 4
• Forks: 22
• Open Issues: 6
• Metadata Files:
  • Readme: README.md

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README

        
## node-hash-ring - Consistent Hashing C++ Add-on for node.js

* * *

See this [blog post](http://ngchi.wordpress.com/2010/08/23/towards-auto-sharding-in-your-node-js-app/) for more information.

### Installation

Via npm:

```bash

$ npm install hash_ring

```

Via git:

```bash

$ git clone http://github.com/bnoguchi/node-hash-ring.git

$ cd node-hash-ring

$ npm run build

```

### Example

```javascript

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 127.0.0.3:8080

```

See [./test/test_distribution.js](./test/test_distribution.js) for another example:

```bash

$ node test/test_distribution.js

```

### Key Hashing

By default, MD5 is used to hash keys.  You can choose another hasher.

```js

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 default

-   `murmur` - [MurmurHash3](https://sites.google.com/site/murmurhash/)

### Tests

To run the tests:

```bash

$ npm test

```

### License

MIT License

* * *

### Author

Brian Noguchi