FormRecognizer behavior when service starts throttling

[dev-td]

• Package Name: azure-ai-formrecognizer
• Package Version: 3.2.0
• Operating System: Windows / Linux
• Python Version: 3.8 / 3.9

Describe the bug When service form recognizer starts to throttle it raises error I/O Operation on closed file.

To Reproduce Please check code snippet below. `

async def analyse_document_async(document: io.BytesIO):
      endpoint, key = ...
  
      # instantiate client
      document_analysis_client = DocumentAnalysisClient(
          endpoint=endpoint, credential=AzureKeyCredential(key)
      )
  
      # generate analysis_args
      analysis_args = {"model_id": "prebuilt-invoice", "document": document}
  
      # non blocking async call
      async with document_analysis_client:
          # Suppose to raise HttpError 429 when service starts to throttle (during scale-out)
          # Instead raise I/O Operation on closed file...
          poller = await document_analysis_client.begin_analyze_document(**analysis_args)
          result = await poller.result()
  
  
      return result


async def orchestrate_async_function(documents: List[io.BytesIO]):
  
      tasks = [asyncio.create_task(analyse_document_async(doc)) for doc in documents]
      # concurrent call
      finished, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_EXCEPTION)
  
      return finished

`

Expected behavior Should raise HttpError 429

[azure-sdk]

Label prediction was below confidence level 0.6 for Model:ServiceLabels: 'Storage:0.12575616,Cognitive - Form Recognizer:0.12186136,Service Bus:0.104554616'

[xiangyan99]

Thanks for the feedback, we’ll investigate asap.

[catalinaperalta]

Thanks for reaching out @dev-td! If possible, could you please share the error message you're getting?

~~@vkurpad could you loop someone in from the service team to take a look?~~ [not a service issue]

[dev-td]

Hi @catalinaperalta , sure it's ValueError: I/O operation on closed file I can try to provide the error stack of that helps.

[kristapratico]

@catalinaperalta possibly related: https://github.com/Azure/azure-sdk-for-python/issues/20040

[catalinaperalta]

Ah I see, thanks for the info @dev-td and @kristapratico. Let me take a look

[catalinaperalta]

Hi @dev-td, I wanted to follow up and let you know that we're still looking into a fix for this issue. In the meantime, if possible, could you share the error stack please?

[ghost]

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