python apscheduler - skipped: maximum number of running instances reached

python cron scheduler apscheduler
boyfromnorth picture boyfromnorth · Dec 1, 2015 · Viewed 19.3k times · Source

I am executing a function every second using Python apscheduler (version 3.0.1)

code:

scheduler = BackgroundScheduler()
scheduler.add_job(runsync, 'interval', seconds=1)
scheduler.start()

It's working fine most of the time but sometimes I get this warning:

WARNING:apscheduler.scheduler:Execution of job "runsync (trigger: interval[0:00:01], next run at: 2015-12-01 11:50:42 UTC)" skipped: maximum number of running instances reached (1)

1.Is this the correct way to execute this method?

2.What does this warning mean? Does it affect the execution of tasks inside the function in anyway?

3.how to handle this?

Answer

Alex Grönholm picture Alex Grönholm · Dec 2, 2015

It means that the task is taking longer than one second and by default only one concurrent execution is allowed for a given job. I cannot tell you how to handle this without knowing what the task is about.

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