Question 1

que-scheduler vs sidekiq-scheduler for Ruby background jobs?

Accepted Answer

que-scheduler is tailored for Que and PostgreSQL users, offering database-backed reliability and seamless integration. Sidekiq-scheduler is better for Sidekiq and Redis environments, with similar cron features but different ecosystems. Choose based on your existing job queue stack.

Question 2

How to handle time zones in que-scheduler without Rails?

Accepted Answer

You must explicitly set the time zone in the configuration block using a string like 'Europe/London'. Without Rails, que-scheduler cannot infer the time zone and will error until configured manually.

Question 3

Can que-scheduler run multiple scheduler jobs for redundancy?

Accepted Answer

No, it enforces a single scheduler job via database constraints to prevent duplicates. High availability comes from Que workers, not multiple scheduler instances, ensuring consistency but limiting redundancy options.

Question 4

What happens if the YAML schedule file changes during deployment?

Accepted Answer

que-scheduler automatically detects changes on each run and adjusts enqueued jobs accordingly. No restart is needed; it handles new, modified, or removed jobs seamlessly based on the updated configuration.

Question 5

How does que-scheduler ensure jobs aren't missed after downtime?

Accepted Answer

Using the 'every_event' schedule type, jobs are enqueued for every missed cron match during downtime, with audit tables tracking executions. This ensures critical batch jobs run for each interval, even after outages.

Question 6

Is there a way to monitor que-scheduler performance or errors?

Accepted Answer

Yes, audit tables provide detailed logs, and errors are reported via Que's standard error notifier. You can query the audit tables for insights or set up custom handlers for integration with monitoring tools.

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