Question 1

How to schedule a job to run every hour with Sidekiq-Cron?

Accepted Answer

Use the cron expression '0 * * * *' in the job configuration, either in a YAML file or Ruby code. For example, in config/schedule.yml, set cron: '0 * * * *' for the job class to enqueue it hourly on the hour.

Question 2

Sidekiq-Cron vs Rufus-Scheduler: which is better for Ruby apps?

Accepted Answer

Sidekiq-Cron is ideal for Sidekiq-integrated scheduling with multi-process safety via Redis, while Rufus-Scheduler is a standalone in-process scheduler better for simpler, single-process apps without Sidekiq dependencies. Choose based on your job processor and scaling needs.

Question 3

Can Sidekiq-Cron handle jobs in different time zones?

Accepted Answer

Yes, you can specify time zones directly in cron expressions, like '0 22 * * 1-5 America/Chicago'. It evaluates against Rails' timezone or UTC by default, allowing flexible timezone support for global applications.

Question 4

How to prevent duplicate jobs in multiple Sidekiq processes?

Accepted Answer

Sidekiq-Cron uses Redis coordination to ensure only the first process enqueues scheduled jobs, as described in its thread-safe multi-process support. This prevents duplicates across processes or nodes in distributed setups.

Question 5

What happens to missed jobs during Sidekiq downtime?

Accepted Answer

By default, jobs missed within the last minute are caught up; you can adjust the reschedule_grace_period configuration (e.g., to 600 seconds for 10 minutes) to handle longer downtimes, such as during deployments, as noted in the under-the-hood section.

Question 6

How to test Sidekiq-Cron schedules in Rails?

Accepted Answer

Use the testing example from the README: load the schedule file in your test suite (e.g., with RSpec) to check for valid cron strings and job classes, ensuring no errors and that all classes can be constantized and respond to perform_async.

sidekiq-cron

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