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Question:

What features are available to delay and/or repeat processing of jobs (sleep/wake)?

Answer:

The following methods of delay have been implemented:

  • A simple way to make a job sleep and wake up is to configure a repeat interval in hours, minutes and seconds. In this case the job is not exactly "delayed" but will be restarted as soon as the interval has elapsed.

  • A job can delay its processing by the JobScheduler API method delay_spooler_process(seconds_or_hhmmss). This is available only if the job implements the API's method spooler_process(). In this case the job remains loaded, i.e. it is in processing but uses no CPU until the scheduled interval has elapsed.

  • A job can be configured for restart should an error have occurred, for example by configuration or API methods:

                         

    In this example, JobScheduler repeats a job immediately after a (first) error occurs. After two to four consecutive errors, however, JobScheduler delays restarting the job by 10 seconds; between five and nine consecutive errors, the delay is one minute; between ten and nineteen errors, it is 24 hours. The job is stopped after the twentieth consecutive error.

    It is possible to set the value of the seconds_or_hhmm_ss parameter to "STOP" in order to restrict the number of (unsuccessful) repetitions of a job. The job then is stopped, i.e. will not restart automatically, when the number of consecutive errors specified is reached.