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Programming language: Crystal
Tags: Algorithms And Data Structures    

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hash_ring

The Consistent Hash Ring is a useful data structure when you operate the distributed servers. This library is implementation of Consistent Hash Ring based on the excellent Elixir hash ring lib.

Installation

Add this to your application's shard.yml:

dependencies:
  hash_ring:
    github: TobiasGSmollett/hash_ring

Usage

require "hash_ring"

# Register 3 servers
hash_ring = HashRing::HashRing.new(["one", "two", "three"])

# Every user is assigned a server by consistent hash ring.
hash_ring.get("user1") # => "three"
hash_ring.get("user2") # => "three"
hash_ring.get("user3") # => "one"
hash_ring.get("user4") # => "two"

# Removes the "two" server
hash_ring.remove("two")

# Exists two servers which are "one" and "three".
hash_ring.get("user1") # => "three"
hash_ring.get("user2") # => "three"
hash_ring.get("user3") # => "one"
hash_ring.get("user4") # => "three"

Contributing

  1. Fork it ( https://github.com/TobiasGSmollett/hash_ring/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request

Contributors

  • tobias TobiasGSmollett - creator, maintainer