Resource leak in Microsoft Azure Form Recognizer azure.ai.formrecognizer.aio.DocumentAnalysisClient unclosed aiohttp Client Session

[abhijithautoai]

• azure-ai-formrecognizer
• 3.3.3
• Ubuntu 22
• Python 3.9.2

While calling azure.ai.formrecognizer.aio.DocumentAnalysisClient for doing ocr for 200 pages using async event loop i am intermittently getting "Unclosed client session warnings". Some of the aiohttp sessions internally created in the client is not closed.

client initialisation code is : self.client = DocumentAnalysisClient(self.config_dict["FORM_RECOGNIZER_ENDPOINT"], credential=DefaultAzureCredential(),
api_version = self.config_dict["FORM_RECOGNIZER_API_VERSION"]
session=session,
,session_owner = False
)
I am passing an aiohttp Session to the client and i am closed the session using async with.
the client is also wrapped around async with.
I tried without passing the session created by me, the resource leak error still persists.

async with aiohttp.ClientSession() as session:
print_active_sessions()
async with await get_ocr_reader(session=session) as reader:
result = await analyze_files( model_id, page_image_list)
return result
this is the consumer code.

To Reproduce

1. Using the client do ocr for 200 pages. Sleep for 3 min Again do ocr for 200 pages. Sleep for 3 min while doing it the third time one will get the resource leak warning.

Ideally all sessions created by DocumentAnalysisClient should be closed by it. If user is passing a session, then the client should use that session and should not create any sessions for itself.

aiohttp version is 3.10.5

[xiangyan99]

Thanks for the feedback, we’ll investigate asap.

[YalinLi0312]

Hi @abhijithautoai , the unclosed session is from credential, you should manually close it or using with keyword. Please follow the examples in this doc: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/identity/azure-identity/README.md#async-credentials

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