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Issue with Downloading Large Views from Tableau Server to CSV

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Évaluation

Difficulté
4/5
Temps estimé
3-5 jours
Accessibilité débutants
42/100
Type d'issue
Bug
Clarté
Plutôt claire
Activité
Calme
Stack technique
python
Domaine
api, backend

Piste de recherche

Start with server.views.populate_csv and the subsequent view.csv handling shown in the report, then reproduce the behavior using a large Tableau view with Python 3.9 and TSC 0.30. Trace where the large response stops progressing or is retained, and compare it with the reported successful small-file path. Done means the large CSV is written successfully, or the limitation and required handling are clearly documented.

Rédigé par le modèle d'indexation à partir du texte de l'issue.

Description

bug help wanted in-progress needs investigation

Describe the bug
I'm encountering an issue when trying to download a view that is around 200 MB in size. My script works perfectly for smaller files (5 MB or 10 MB), but it keeps running indefinitely and doesn't write data into the CSV file for the larger view.

The script successfully logs "CSV populated," indicating that server.views.populate_csv completes, but the file is not written for larger views.

Here's the code I'm using:

def download_file(client, server, content_url, output_file, region):

    # NOTE: Monkey patched TSC.RequestOptions.Field class

    # since the contentUrl filter parameter was not supported

    setattr(TSC.RequestOptions.Field, 'ContentURL', 'contentUrl')

    req_option = TSC.RequestOptions()

    req_option.filter.add(TSC.Filter(TSC.RequestOptions.Field.ContentURL,

                     TSC.RequestOptions.Operator.Equals,

                     content_url))

    logger.info('Fetching views...')

    views, pagination_item = server.views.get(req_option)

    logger.info(f'Views fetched: {len(views)}')

    if len(views) == 1:

      only_matched_index = 0

      view = views[only_matched_index]

      logger.info('Populating CSV...')

      server.views.populate_csv(view, TSC.CSVRequestOptions(maxage = 5))

      logger.info('CSV populated.')

      with open(output_file, 'wb') as f:

        f.write(b''.join(view.csv))

      logger.info(f"CSV DATA WRITTEN TO the {output_file}")

OUTPUT:

INFO:main:Fetching views...

INFO:main:Views fetched: 1

INFO:main:Populating CSV...

INFO:main:CSV populated.

Could anyone suggest what might be going wrong with handling larger views? Are there any additional steps or considerations when dealing with larger files in Tableau Server that I might be missing?

Any insights or suggestions would be greatly appreciated!

Thank you!

Versions
Details of your environment, including:

  • Python version:3.9
  • TSC library version:0.30
Langage dominant
Python
Étoiles
716
Forks
445
Merge moyen
1 j 2 h
PR mergées (30 j)
1

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