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Crontab-Expressions-for-Pipeline-Scheduler.md

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Write crontab expressions for pipeline scheduler

You can use cron expressions to schedule FHIR Analytics pipeline jobs. FHIR Analytics pipeline is using NCrontab to parse the cron expressions.

The cron expression the pipeline currently supported is a string consisting of 6 fields, separated by spaces. Each field represents a particular unit of time and specifies when the job should be run. The format for a cron expression is six-part as follows:

* * * * * *
- - - - - -
| | | | | |
| | | | | +--- day of week (0 - 6) (Sunday=0)
| | | | +----- month (1 - 12)
| | | +------- day of month (1 - 31)
| | +--------- hour (0 - 23)
| +----------- min (0 - 59)
+------------- sec (0 - 59)

The fields are as follows:

  • Second: The second of the minute (0-59)
  • Minute: The minute of the hour (0-59)
  • Hour: The hour of the day (0-23)
  • Day of the month: The day of the month (1-31)
  • Month: The month of the year (1-12)
  • Day of the week: The day of the week (0-6), where Sunday is 0 and Saturday is 6.

NOTE: You can not omit the Second field in cron expression when configuring the pipeline, although other applications may allow this.

Here are some examples:

  • Run every 10 minutes: 0 /10 * * * *
  • Run every 30 minutes: 0 /30 * * * *
  • Run daily at 0am: 0 0 0 * * *
  • Run at 10:00am every Saturday: 0 0 10 * * 6