gitlab-sidekiq-fetcher is an extension to Sidekiq that adds support for reliable fetches from Redis.

It's based on

There are two strategies implemented: Reliable fetch using rpoplpush command and semi-reliable fetch that uses regular brpop and lpush to pick the job and put it to working queue. The main benefit of "Reliable" strategy is that rpoplpush is atomic, eliminating a race condition in which jobs can be lost. However, it comes at a cost because rpoplpush can't watch multiple lists at the same time so we need to iterate over the entire queue list which significantly increases pressure on Redis when there are more than a few queues. The "semi-reliable" strategy is much more reliable than the default Sidekiq fetcher, though. Compared to the reliable fetch strategy, it does not increase pressure on Redis significantly.


Add the following to your Gemfile:

gem 'gitlab-sidekiq-fetcher', require: 'sidekiq-reliable-fetch'


Enable reliable fetches by calling this gem from your Sidekiq configuration:

Sidekiq.configure_server do |config|

  # …

There is an additional parameter config.options[:semi_reliable_fetch] you can use to switch between two strategies:

Sidekiq.configure_server do |config|
  config.options[:semi_reliable_fetch] = true # Default value is false



LGPL-3.0, see the LICENSE file.