[BUG] Flytescheduler cron expression validation process about flyte HOT 2 OPEN

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Hey @BroderPeters, back again to keep us on our toes, huh? 😄 Always a pleasure seeing your name pop up here!

The error you're encountering is likely due to the fact that the cron expression 0 6 * * MON#1 is not supported by the cron parser used in Flyte. The # symbol is not a standard cron expression and is not mentioned in the cron implementation described in the comments of the CronSchedule message in the schedule.proto file.

The cron implementation used by Flyte is based on the standard cron as described by Wikipedia and also supports nonstandard predefined scheduling definitions as described by Amazon CloudWatch, except @reboot.

To resolve this issue, you have two options:

1. Modify your cron expression to fit the supported format. For example, if you want to schedule a job for the first Monday of every month at 6:00, you could use a cron expression like 0 6 1-7 * MON. This will schedule the job to run at 6:00 on Monday, but only if the date is between the 1st and the 7th, effectively ensuring that it runs on the first Monday of the month.

2. If you need to use the # symbol or other non-standard cron expressions, you would need to modify the cron parser used by Flyte to support these expressions. This would involve changing the source code of Flyte and may not be feasible depending on your situation.

Please note that any changes to the cron parser would need to be thoroughly tested to ensure they don't introduce any new issues. You can find more information about the cron parser used by Flyte in the schedule.proto file.

Sources

• flyteidl/protos/flyteidl/admin/schedule.proto
• flyteidl/gen/pb-java/flyteidl/admin/ScheduleOuterClass.java

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Thank you for opening your first issue here! 🛠

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