Restart Gurobi Compute Server job with python code after status 502

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Hancheng Li

• 2024年10月22日 13:43
• 編集済み

I'm hosting a small python web app via Jupyter + Docker on a Linux server, and it has a Gurobi backend set up and connected to the Compute Server via an Instant Cloud license.

The solver was working fine when I initially started the  but showed this error message "GurobiError: Unexpected response (status 502, command PUT https://...... )" after a while. I believe the Compute Server job automatically stopped after a period of time. Is there a way to catch this error and restart it via python code instead of having to restart the docker container every time this happens? Thanks a lot!

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• 

  Alex Ginete

  Gurobi Staff

  • 2024年10月22日 15:11
  • 編集済み

  Hi Hancheng,

  You can implement a retry mechanism using a try-except block. Something like:

  try:
      model.optimize()
  except gp.GurobiError as e:
      error_message = str(e)
      if "status 502" in error_message:
          print("Retrying due to 502")
          model.optimize()

  However, this only retries to optimize the model once. Setting up a retry limit can mitigate this.

  Regards,
  Alex

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• 

  Hancheng Li

  • 2024年10月22日 16:17
  • 編集済み

  

  

  

  Hi Alex. Thanks for the response, but I don't think it solves the issue, as the code is failing at model creation when it initially communicates with the Compute Server. I think it's gone into idle shutdown after 60 minutes per the Instant Cloud documentation

  model = gp.Model("model_name")

  If I put a try-except here, the except needs to be some command that wakes up the server from idle

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• 

  Alex Ginete

  Gurobi Staff

  • 2024年10月23日 07:11

  Hi Hancheng,

  Since you are using Instant Cloud, can you provide me the Job ID so I can check the logs?

  Regards,
  Alex

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