enable download of large file via dcc.download
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bug
cs
P2
- Dominant language
- Python
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Description
My code is attached below, very simple. I test the download function successfully with a small sample (1MB). However, I need to return a large file(CSV) of about 1 GB, which raises the Memory Error. What should I do?
dbc.Button('Download', color='primary', id='btn_data',outline=True),
dcc.Download(id="download-image")
@app.callback(
Output("download_data", "data"),
Input("btn_data", "n_clicks"),
prevent_initial_call=True,
)
def func(n_clicks):
return dcc.send_file(
"./download/verylarge.csv"
)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the callback using dcc.Download and dcc.send_file, then reproduce the reported Memory Error with the approximately 1 GB CSV rather than the 1 MB sample. Done means a large CSV can be downloaded without exhausting memory; the issue does not name a source file or test to update.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- api, backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100