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I am making a python-based web app using Streamlit. After deploying it in Heroku, the build succeeds but there is an application error. I don't have any idea where in the source code this error is being generated. Please help me! The error :

2022-07-18T18:55:37.985429+00:00 app[web.1]:     Inotify._raise_error()
2022-07-18T18:55:37.985439+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.10/site-packages/watchdog/observers/inotify_c.py", line 398, in _raise_error
2022-07-18T18:55:37.985636+00:00 app[web.1]:     raise OSError(errno.ENOSPC, "inotify watch limit reached")
2022-07-18T18:55:37.985677+00:00 app[web.1]: OSError: [Errno 28] inotify watch limit reached
2022-07-18T18:55:38.387667+00:00 heroku[web.1]: Process exited with status 1
2022-07-18T18:55:38.510041+00:00 heroku[web.1]: State changed from starting to crashed
2022-07-18T18:55:48.000000+00:00 app[api]: Build succeeded
2022-07-18T18:57:33.589417+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=invezto.herokuapp.com request_id=bc8f4556-852e-4dad-8b67-71e49ffaaf23 fwd="49.37.45.19" dyno= connect= service= status=503 bytes= protocol=https
2022-07-18T18:57:33.917128+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=invezto.herokuapp.com request_id=46e2e615-17dc-42f6-a86d-4dfc5fd5ecfc fwd="49.37.45.19" dyno= connect= service= status=503 bytes= protocol=https ```
molbdnilo
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Jaggernaut
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2 Answers2

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Adding option --server.fileWatcherType none at the command line helped me to resolve similar issue. A full example would look like this:

streamlit run app.py --server.fileWatcherType none

More solutions here

Antoine 'hashar' Musso
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sswt
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  • Note that my answer, although not the popular vote, keeps file watching turned on, a nice feature for debugging live. – Herbert Apr 10 '23 at 12:06
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Streamlit recursively monitors changes in the parent folder of the application script, e.g. app.py [source].

The idea is that if source files update, the app is 'rerun', as a convenience for app development. However, if this folder contains too many subfolders and subfiles, apparently watchdog reaches a limit and raises an error. This easily happens if you run straight from your home directory, which contains tons of configuration files, etc. Or maybe when you run from a git repository with numerous files in .git (just speculating).

You can resolve this by either placing the app.py script in a (sub)folder than only contains dependencies that you'll edit during development, or by --server.fileWatcherType none and accept the nuisance of manually restarting.

streamlit run app.py --server.fileWatcherType none

(as suggested by @swwt)

Herbert
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  • +1 for pointing out the consequences of setting this to none. When deploying a Streamlit app, it's perfectly fine to disable it then. – nichoio Aug 01 '23 at 12:04