Matador

Build Status

Stop cache expiration triggered thundering herd problems with Matador. Currently works with redis.

Installation

Add this line to your application's Gemfile:

gem 'matador'

And then execute:

$ bundle

Or install it yourself as:

$ gem install matador

Usage

Set your cache service object (currently only supports redis)

require "matador"
require "redis"

$redis = Redis.new(host: "127.0.0.1", port: "16379")
Matador.cache_store = $redis

Caching with an expiration is susceptible to a thundering herd in high traffic situations:

data = time_consuming_operation(...)
$redis.set("some_key", data)
$redis.expire("some_key", 120)

Wrap it in matador. When the cache expires after 2 minutes, the first request goes through to generate the new cache. While the new cache is being built (next 10 seconds), all other requests are served the stale cache.

Matador.fetch("some_key", :ttl => 120, :therd_ttl => 10) do
  time_consuming_operation
end

TO DO

  1. Integrate with Memcache

Contributing

  1. Fork it ( http://github.com//matador/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 new Pull Request