reset next job execution if the system time has been moved backwards #480
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CybotTM
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- Add detection for system time moving backwards (NTP correction, VM snapshot restore) and reschedule affected entries (robfig#480) - Pre-allocate slice in removeEntry to avoid reallocations (robfig#539) - Add tests for time backwards detection and WithSeconds option
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Suppose you have a job scheduled every minute.
The current time is 15:00:00 and for reasons outside our control it is set to 17:00:00, the job runs as expected and "Next" will be set to 17:01:00.
If the system clock returns to the correct time and so now is, for example, 15:01:00, when we calculate the duration of the timer here
cron/cron.go
Line 259 in bc59245
we will have something like 2 hours and then no job runs for 2 hours.
This patch fixes the issue. Thank you