ch gem
yet another consistent hashing library
Implemented using AVLTree.
Allow nodes to be inserted into multiple positions.
Allow nodes to be inserted into specific positions for more granular control.
Installation
Add this line to your application's Gemfile:
gem 'ch'And then execute:
$ bundle
Or install it yourself as:
$ gem install ch
Usage
require 'ch'
ring = ConsistentHashing::Ring.new
# add nodes
ring.add_node('127.0.0.1:6379') # key 102336333644841978549106395032298540172546507605
ring.add_node('127.0.0.1:6380') # key 455838294994277962587720662485947692006035699684
# between nodes
ring.node_for_key(1).should == '127.0.0.1:6380' # key 304942582444936629325699363757435820077590259883
# larger than both nodes
ring.node_for_key(2).should == '127.0.0.1:6379' # key 1246245281287062843477446394631337292330716631216
# pin point!
ring.add_node('127.0.0.1:6381', 304942582444936629325699363757435820077590259883 + 1)
ring.node_for_key(1).should == '127.0.0.1:6381'
# key is simply computed with:
Digest::SHA1.hexdigest(key.to_s).hexCredits
Contributing
- Fork it ( https://github.com/forresty/ch/fork )
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request