Cron Jobs: Make Repeated Runs Safe
A scheduled task may overlap with itself or run twice after a retry. This guide gives you a small, testable way to approach the issue before changing a live system.
A practical workflow
- Give each run an idempotent operation key or a clear lock strategy.
- Log start, end and outcome, then test duplicate execution.
What to check
A cron expression is not a monitoring system; alert when the task stops succeeding. Compare the result with the original problem and record what changed. If a measurement or test does not support the change, revisit the assumption rather than adding more complexity.
Keep the experiment small enough to reverse. Document the starting state, the change and the result so another person can repeat the process. Product menus and versions can change, so check the current documentation for your environment.
Official reference: Read the documentation.