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https://issues.apache.org/jira/browse/AIRFLOW-5820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Nichols updated AIRFLOW-5820:
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Description:
I am new to Airflow. I made a simple task in a trivial DAG. It takes 0.004
seconds to fill the DagBag, and the task takes only 3 seconds to run.
Max concurrency must be set to 1 since my task hits a public API with a rate
limit in effect.
I set it up to backfill 3 years of data; so I need to run the task ~1000 times
in sequence. This should take ~3000 seconds.
Unfortunately, Airflow spends 3 seconds running the task, and then waits around
40 seconds before starting the next day of the backfill. So more than 90% of
the time is Airflow spinning, and the job takes more than 10x longer than
required.
I think there should be a way to make backfill jobs run quickly, one after
another, in this very simple case I have described. There is simply not 40
seconds worth of necessary compute to do between tasks.
was:
I am new to Airflow. I made a simple task in a trivial DAG. It takes 0.004
seconds to fill the DagBag, and the task takes only 3 seconds to run.
Max concurrency must be set to 1 since my task hits a public API with a rate
limit in effect.
I set it up to backfill 3 years of data; so I need to run the task ~1000 times
in sequence. This should take ~3000 seconds.
Unfortunately, Airflow spends 3 seconds running the task, and then waits around
40 seconds before starting the next day of the backfill. So more than 90% of
the time is Airflow spinning, and the job takes ~10x longer than required.
I think there should be a way to make backfill jobs run quickly, one after
another, in this very simple case I have described. There is simply not 40
seconds worth of necessary compute to do between tasks.
> Long delay between individual tasks in a large backfill
> -------------------------------------------------------
>
> Key: AIRFLOW-5820
> URL: https://issues.apache.org/jira/browse/AIRFLOW-5820
> Project: Apache Airflow
> Issue Type: Improvement
> Components: backfill
> Affects Versions: 1.10.5
> Environment: Ubuntu 18
> Reporter: Eric Nichols
> Priority: Major
>
> I am new to Airflow. I made a simple task in a trivial DAG. It takes 0.004
> seconds to fill the DagBag, and the task takes only 3 seconds to run.
> Max concurrency must be set to 1 since my task hits a public API with a rate
> limit in effect.
> I set it up to backfill 3 years of data; so I need to run the task ~1000
> times in sequence. This should take ~3000 seconds.
> Unfortunately, Airflow spends 3 seconds running the task, and then waits
> around 40 seconds before starting the next day of the backfill. So more than
> 90% of the time is Airflow spinning, and the job takes more than 10x longer
> than required.
> I think there should be a way to make backfill jobs run quickly, one after
> another, in this very simple case I have described. There is simply not 40
> seconds worth of necessary compute to do between tasks.
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