Sidekiq::Throttled

Concurrency and threshold throttling for Sidekiq.

Installation

Add this line to your application's Gemfile:

gem "sidekiq-throttled"

And then execute:

$ bundle

Or install it yourself as:

$ gem install sidekiq-throttled

Usage

Add somewhere in your app's bootstrap (e.g. config/initializers/sidekiq.rb if you are using Rails):

require "sidekiq/throttled"
Sidekiq::Throttled.setup!

Load order can be an issue if you are using other Sidekiq plugins and/or middleware. To prevent any problems, add the .setup! call to the bottom of your init file.

Once you've done that you can include Sidekiq::Throttled::Worker to your job classes and configure throttling:

class MyWorker
  include Sidekiq::Worker
  include Sidekiq::Throttled::Worker

  sidekiq_options :queue => :my_queue

  sidekiq_throttle({
    # Allow maximum 10 concurrent jobs of this class at a time.
    :concurrency => { :limit => 10 },
    # Allow maximum 1K jobs being processed within one hour window.
    :threshold => { :limit => 1_000, :period => 1.hour }
  })

  def perform
    # ...
  end
end

Observer

You can specify an observer that will be called on throttling. To do so pass an :observer option with callable object:

class MyWorker
  include Sidekiq::Worker
  include Sidekiq::Throttled::Worker

  MY_OBSERVER = lambda do |strategy, *args|
    # do something
  end

  sidekiq_options :queue => :my_queue

  sidekiq_throttle({
    :concurrency => { :limit => 10 },
    :threshold   => { :limit => 100, :period => 1.hour }
    :observer    => MY_OBSERVER
  })

  def perform(*args)
    # ...
  end
end

Observer will receive strategy, *args arguments, where strategy is a Symbol :concurrency or :threshold, and *args are the arguments that were passed to the job.

Dynamic throttling

You can throttle jobs dynamically with :key_suffix option:

class MyWorker
  include Sidekiq::Worker
  include Sidekiq::Throttled::Worker

  sidekiq_options :queue => :my_queue

  sidekiq_throttle({
    # Allow maximum 10 concurrent jobs per user at a time.
    :concurrency => { :limit => 10, :key_suffix => -> (user_id) { user_id } }
  })

  def perform(user_id)
    # ...
  end
end

You can also supply dynamic values for limits and periods by supplying a proc for these values. The proc will be evaluated at the time the job is fetched and will receive the same arguments that are passed to the job.

class MyWorker
  include Sidekiq::Worker
  include Sidekiq::Throttled::Worker

  sidekiq_options :queue => :my_queue

  sidekiq_throttle({
    # Allow maximum 1000 concurrent jobs of this class at a time for VIPs and 10 for all other users.
    :concurrency => {
      :limit      => ->(user_id) { User.vip?(user_id) ? 1_000 : 10 },
      :key_suffix => ->(user_id) { User.vip?(user_id) ? "vip" : "std" }
    },
    # Allow 1000 jobs/hour to be processed for VIPs and 10/day for all others
    :threshold   => {
      :limit      => ->(user_id) { User.vip?(user_id) ? 1_000 : 10 },
      :period     => ->(user_id) { User.vip?(user_id) ? 1.hour : 1.day },
      :key_suffix => ->(user_id) { User.vip?(user_id) ? "vip" : "std" }
  })

  def perform(user_id)
    # ...
  end
end

NB Don't forget to specify :key_suffix and make it return different values if you are using dynamic limit/period options. Otherwise you risk getting into some trouble.

Concurrency throttling fine-tuning

Concurrency throttling is based on distributed locks. Those locks have default time to live (TTL) set to 15 minutes. If your job takes more than 15 minutes to finish, lock will be released and you might end up with more jobs running concurrently than you expect.

This is done to avoid deadlocks - when by any reason (e.g. Sidekiq process was OOM-killed) cleanup middleware wasn't executed and locks were not released.

If your job takes more than 15 minutes to complete, you can tune concurrency lock TTL to fit your needs:

# Set concurrency strategy lock TTL to 1 hour.
sidekiq_throttle(:concurrency => { :limit => 20, :ttl => 1.hour.to_i })

Enhanced Queues list

This gem provides ability to pause/resume queues from processing by workers. So you may simply pause particular queue without need to stop and reconfigure workers by simply pushing a button on sidekiq web UI.

By default we add Enhanced Queues tab with this functionality. But if you want you can override default Queues tab completely (notice that page will still be available using it's URL, but tab will be pointing enhanced version). To do so, just call Sidekiq::Throttled::Web.enhance_queues_tab! somewhere in your initializer/bootstrap code. If you are using rails, you might want to add it right into your config/routes.rb file:

# file config/routes.rb

require "sidekiq/web"
require "sidekiq/throttled/web"

Rails.application.routes.draw do
  # ...

  # Replace Sidekiq Queues with enhanced version!
  Sidekiq::Throttled::Web.enhance_queues_tab!

  # Mount Sidekiq Web UI to `/sidekiq` endpoint
  mount Sidekiq::Web => "/sidekiq"

  # ...
end

Supported Ruby Versions

This library aims to support and is tested against the following Ruby versions:

Ruby 2.4.x
Ruby 2.5.x
Ruby 2.6.x

If something doesn't work on one of these versions, it's a bug.

This library may inadvertently work (or seem to work) on other Ruby versions, however support will only be provided for the versions listed above.

If you would like this library to support another Ruby version or implementation, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.

Supported Sidekiq Versions

This library aims to support work with following Sidekiq versions:

Sidekiq 5.0.x
Sidekiq 5.1.x
Sidekiq 5.2.x
Sidekiq 6.0.x
Sidekiq 6.1.x

Contributing

Fork sidekiq-throttled on GitHub
Make your changes
Ensure all tests pass (bundle exec rake)
Send a pull request
If we like them we'll merge them
If we've accepted a patch, feel free to ask for commit access!

Development

bundle update
bundle exec appraisal install   # install dependencies for all gemfiles
bundle exec appraisal update    # update dependencies for all gemfiles
bundle exec appraisal rspec     # run rspec against each gemfile
bundle exec rubocop             # run static code analysis

Don't forget to run appraisal update after any changes to Gemfile.