azure-functions-host: Function execution logs are duplicated in App Service log stream
If you access the log stream for your entire function app, you will see duplicated entries for function starting/completion:
When a function executes with file logging enabled, the following entries are written to both the host log and the function log, i.e. to files in:
-
D:\home\LogFiles\Application\Functions\Host\
-
D:\home\LogFiles\Application\Functions\Function\function-name\
The entries look like this:
2017-04-18T22:54:20.013 Function started (Id=8c130624-cfb2-47d7-8e1f-05047a10a17d)
2017-04-18T22:54:20.013 Function completed (Success, Id=8c130624-cfb2-47d7-8e1f-05047a10a17d, Duration=0ms)
Because the same entry is written to both locations, it appears in the log stream twice.
About this issue
- Original URL
- State: open
- Created 7 years ago
- Reactions: 10
- Comments: 28 (11 by maintainers)
This is highly confusing and just cost me a few hours of searching for the reason. It should be fixed or one need to somehow be warned.
Five years later and this is still a nuisance. Any solution in sight?
@MatheusNani That’s a duplicate execution, not an unexpected duplicate log entry. You may have better luck asking on stackoverflow.
I have a similar issue with a Timer Trigger Function. For some reason it’s being kickoff twice in a row and I’m getting duplicate emails. Any updates regarding this issue?
Also I found a workaround - add
--provider application/functions/hostWe think Mathew’s suggested approach makes sense. I should have another update in a few weeks. While the work is happening in a different component, I’ll leave this issue open for the time being.