Thread
#prefect-community
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    rilshok

    8 months ago
    Hello everyone, I have a question about scheduling flow launches. Let's say I expect that the execution of one run will take 2 hours. Using the UI. I set a schedule with a launch every two hours. What happens if for some reason the average execution time of my flow starts taking three hours? Let's say we have a plan:1. Launch at 12:00 2. Launch at 14:00 3. Launch at 16:00 The launch (1) took three hours. Will the scheduled launch be completed at 14:00 (2)? If all scheduled launches are completed. Can I set up my flow so that startup (2) is skipped?
    Kevin Kho

    Kevin Kho

    8 months ago
    You can on Prefect Cloud with a combination of two things. First is setting a Flow Run Concurrency Limit so that only one of these flows runs at a given time. The second is using an Automation to cancel Flow 2 if it’s late by a certain amount of time.
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    rilshok

    8 months ago
    @Kevin Kho, thanks for your reply. In the case of the prefect's local server, all launches will be performed according to the schedule, right?
    Kevin Kho

    Kevin Kho

    8 months ago
    Server takes more work but a community member gave their code here . You need to use a state handler to hit the GraphQL at the beginning of the Flow to check for concurrent runs. If there are, then cancel the next one.
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    rilshok

    8 months ago
    Thank you