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From Nicholas Hodgkinson <>
Subject Determine if a DAG is running
Date Wed, 15 Feb 2017 23:51:26 GMT
I'm using the TriggerDagRunOperator within a Sensor DAG to automatically
sense and start loads, however the problem I'm coming across, given that I
want to run this Sensor DAG often (every 5 minutes), is the same run can be
triggered multiple times. Is there a way to avoid this? I've set
max_active_runs to 1, but that doesn't seem to be respected when doing
manual triggers. I suppose I could write out a file when I trigger the job,
have the job clean it up, and then not trigger if that file exists, but I
feel like there should be a better way to accomplish this; not to mention a
failure in the dag would break this process.

Thoughts? I've been trying to figure this out for a while and Gitter and
the web haven't been much help.

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