README.md

Sidekiq::Grouping

Allows to combine similar sidekiq jobs into groups to process them at once.

Useful for:

• Grouping asynchronous API index calls into bulks for bulk updating/indexing.
• Periodical batch updating of recently changing database counters.

Please note:

• As of 1.0 batch_size renamed to batch_flush_size.
• As of 1.0.6 works with Sidekiq 4.
• As of 1.0.8 Locking is atomic (set nx/ex) and will no longer lead to batches that are permalocked and stuck.
• Enabling the reliable configuration option requires Redis 6.2 or higher.

Usage

Create a worker:

class ElasticBulkIndexWorker
  include Sidekiq::Worker

  sidekiq_options(
    queue: :elastic_bulks,
    batch_flush_size: 30,     # Jobs will be combined when queue size exceeds 30
    batch_flush_interval: 60, # Jobs will be combined every 60 seconds
    retry: 5
  )

  def perform(group)
    client = Elasticsearch::Client.new
    client.bulk(body: group.flatten)
  end
end

Perform a jobs:

# At least 30 times

ElasticBulkIndexWorker.perform_async({ delete: { _index: 'test', _id: 5, _type: 'user' } })
ElasticBulkIndexWorker.perform_async({ delete: { _index: 'test', _id: 6, _type: 'user' } })
ElasticBulkIndexWorker.perform_async({ delete: { _index: 'test', _id: 7, _type: 'user' } })
...

This jobs will be grouped into the single job with the single argument:

[
  [{ delete: { _index: 'test', _id: 5, _type: 'user' } }],
  [{ delete: { _index: 'test', _id: 6, _type: 'user' } }],
  [{ delete: { _index: 'test', _id: 7, _type: 'user' } }]
  ...
]

Control grouping

• If batch_flush_size option is set - grouping will be performed when batched queue size exceeds this value or Sidekiq::Grouping::Config.max_batch_size (1000 by default).
• If batch_flush_interval option is set - grouping will be performed every given interval.
• If both are set - grouping will be performed when first condition become true. For example, if batch_flush_interval is set to 60 seconds and batch_flush_size is set to 5 - group task will be enqueued even if just 3 jobs are in the queue at the end of the minute. In the other hand, if 5 jobs were enqueued during 10 seconds - they will be grouped and enqueued immediately.

Options

• batch_unique prevents enqueue of jobs with identical arguments.

  class FooWorker
    include Sidekiq::Worker
  
    sidekiq_options batch_flush_interval: 10, batch_unique: true
  
    def perform(n)
      puts n
    end
  end
  
  FooWorker.perform_async(1)
  FooWorker.perform_async(1)
  FooWorker.perform_async(2)
  FooWorker.perform_async(2)
  
  # => [[1], [2]]

• batch_size is used to control single group size.

  class FooWorker
    include Sidekiq::Worker
  
    sidekiq_options batch_flush_size: 5, batch_size: 2
  
    def perform(n)
      puts n
    end
  end
  
  FooWorker.perform_async(1)
  FooWorker.perform_async(2)
  FooWorker.perform_async(3)
  FooWorker.perform_async(4)
  FooWorker.perform_async(5)
  
  # => [[1], [2]]
  # => [[3], [4]]
  # => [[5]]

• batch_ttl is the number of seconds used by Supervisor to determine when a pending flush has expired and needs to be re-queued. Defaults to 3600.

• tests_env is used to silence some logging in test environments (see below). Default: true if Rails.env.test?, false otherwise.

Web UI

Add this line to your config/routes.rb to activate web UI:

require "sidekiq/grouping/web"

Configuration

Specify grouping configuration inside of sidekiq.yml:

grouping:
  :poll_interval: 5       # Amount of time between polling batches
  :max_batch_size: 5000   # Maximum batch size allowed
  :lock_ttl: 1            # Batch queue flush lock timeout job enqueues
  :reliable: true         # Enable reliable queueing and expired job supervisor

Or set it in your code:

Sidekiq::Grouping::Config.poll_interval = 5
Sidekiq::Grouping::Config.max_batch_size = 5000
Sidekiq::Grouping::Config.lock_ttl = 1
Sidekiq::Grouping::Config.reliable = true

Note that you should set poll_interval option inside of sidekiq.yml to take effect. Setting this param in your ruby code won't change actual polling frequency.

Testing with Sidekiq::Testing.fake!

Sidekiq::Grouping uses internal queues for grouping tasks. If you need to force flush internal queues into normal Sidekiq queues, use Sidekiq::Grouping.force_flush_for_test!.

See example:

# worker
class GroupedWorker

  include Sidekiq::Worker
  sidekiq_options(
    queue: :custom_queue,
    retry: 5,
    batch_flush_size: 9,
    batch_flush_interval: 10,
    batch_size: 3,
    batch_unique: true
  )

  def perform(grouped_arguments)
    # ... important payload
  end

end

# test itself
RSpec.describe GroupedWorker, type: :worker do

  describe '#perform' do
    it 'calls perform with array of arguments' do
      Sidekiq::Testing.fake! do
        described_class.perform_async(1)
        described_class.perform_async(1)
        described_class.perform_async(2)
        described_class.perform_async(2)

        # All 4 above asks will be put to :custom_queue despite of :batch_flush_size is set to 9.
        Sidekiq::Grouping.force_flush_for_test!

        last_job = described_class.jobs.last
        expect(last_job['args']).to eq([[[1], [2]]])
        expect(last_job['queue']).to eq('custom_queue')
      end
    end
  end

end

Installation

Add this line to your application's Gemfile:

gem 'sidekiq-grouping'

And then execute:

$ bundle

Or install it yourself as:

$ gem install sidekiq-grouping

Contributing

1. Fork it ( http://github.com/gzigzigzeo/sidekiq-grouping/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