I'm trying to schedule an interval job with APScheduler (v3.0.0).
I've tried:
from apscheduler.schedulers.blocking import BlockingSchedulersched = BlockingScheduler()def my_interval_job():print 'Hello World!'sched.add_job(my_interval_job, 'interval', seconds=5)sched.start()and
from apscheduler.schedulers.blocking import BlockingSchedulersched = BlockingScheduler()@sched.scheduled_job('interval', id='my_job_id', seconds=5)def my_interval_job():print 'Hello World!'sched.start()Either should work according to the docs, but the job never fires...
UPDATE:
It turns out there was something else, environment-related, preventing the task from running. This morning, the task is working fine without any modifications to the code from yesterday.
UPDATE 2:
After further testing, I've found that 'interval' jobs seem to be generally flaky... The above code now works in my dev environment, but not when I deploy to a staging env (I'm using a heroku app for staging). I have other apscheduler 'cron' jobs that work just fine in the staging/production envs.
When I turn on DEBUG logging for the "apscheduler.schedulers" logger, the log indicates that the interval job is added:
Added job "my_cron_job1" to job store "default"
Added job "my_cron_job2" to job store "default"
Added job "my_interval_job" to job store "default"
Scheduler started
Adding job tentatively -- it will be properly scheduled when the scheduler starts
Adding job tentatively -- it will be properly scheduled when the scheduler starts
Looking for jobs to run
Next wakeup is due at 2015-03-24 15:05:00-07:00 (in 254.210542 seconds)
How can the next wakeup be due 254 seconds from now when the interval job is set to 5 seconds??
Best Answer
You need to keep the thread alive. Here is a example of how I used it.
from subprocess import callimport timeimport osfrom pytz import utcfrom apscheduler.schedulers.background import BackgroundSchedulerdef job():print("In job")call(['python', 'scheduler/main.py'])if __name__ == '__main__':scheduler = BackgroundScheduler()scheduler.configure(timezone=utc)scheduler.add_job(job, 'interval', seconds=10)scheduler.start()print('Press Ctrl+{0} to exit'.format('Break' if os.name == 'nt' else 'C'))try:# This is here to simulate application activity (which keeps the main thread alive).while True:time.sleep(5)except (KeyboardInterrupt, SystemExit):# Not strictly necessary if daemonic mode is enabled but should be done if possiblescheduler.shutdown()I haven't figured out what caused the original issue, but I got around it by swapping the order in which the jobs are scheduled, so that the 'interval' job is scheduled BEFORE the 'cron' jobs.
i.e. I switched from this:
def my_cron_job1():print "cron job 1"def my_cron_job2():print "cron job 2"def my_interval_job():print "interval job"if __name__ == '__main__':from apscheduler.schedulers.blocking import BlockingSchedulersched = BlockingScheduler(timezone='MST')sched.add_job(my_cron_job1, 'cron', id='my_cron_job1', minute=10)sched.add_job(my_cron_job2, 'cron', id='my_cron_job2', minute=20)sched.add_job(my_interval_job, 'interval', id='my_job_id', seconds=5)to this:
def my_cron_job1():print "cron job 1"def my_cron_job2():print "cron job 2"def my_interval_job():print "interval job"if __name__ == '__main__':from apscheduler.schedulers.blocking import BlockingSchedulersched = BlockingScheduler(timezone='MST')sched.add_job(my_interval_job, 'interval', id='my_job_id', seconds=5)sched.add_job(my_cron_job1, 'cron', id='my_cron_job1', minute=10)sched.add_job(my_cron_job2, 'cron', id='my_cron_job2', minute=20)and now both the cron jobs and the interval jobs run without a problem in both environments.
How can the next wakeup be due 254 seconds from now when the intervaljob is set to 5 seconds??
It's simple:you have many pending executions as your most of the jobs didn't completed in the interval-window of time.
You could use the following parameters in order to sort this out:
**misfire_grace_time**: Maximum time in seconds for the job execution to be allowed to delay before it is considered a misfire **coalesce**: Roll several pending executions of jobs into oneTo read more, check the documentation here.
The documentation had an error there. I've fixed it now.That first line should be:
from apscheduler.schedulers.blocking import BlockingSchedulerIt would've raised an ImportError though, but you didn't mention any.Did you try any of the provided examples?
Ok, I've looked at the updated question.
The reason you're having problems may be that you could be using the wrong timezone. Your country is currently using daylight saving time in most locations, so the correct timezone would probably be MDT (Mountain Daylight Time). But that will break again when you move back to standard time. So I advise you to use a timezone like "America/Denver". That will take care of the DST switches.
Question: Are you using CentOS? So far it's the only known operating system where automatic detection of the local timezone is impossible.