[BUG] mflow R package only returns `Error in wait_for`[BUG] about mlflow HOT 9 OPEN

@acircleda I can't repro your problem on MLflow 2.11.3, could you double check you installed it correctly? Are the environment variables (MLFLOW_BIN, MLFLOW_PYTHON_BIN) set correctly?
I can correctly open mlflow ui with below command:

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I suspect (from some previous issues) this may be a Windows-specific issue.

I believe the environment variables are set correctly:

> Sys.which('python')
                    python 
"C:\\PYTHON~1\\python.exe" 
> Sys.which('mlflow')
                             mlflow 
"C:\\PYTHON~1\\Scripts\\mlflow.exe" 

In checking these paths I can confirm the exe's exist.

Some additional info:

If I run, server <- mlflow::mlflow_server(), the following is returned:

$server_url
[1] "http://127.0.0.1:5000"

$handle
PROCESS 'mlflow.exe', running, pid 22388.

$file_store
[1] "file://C:/Users/XXX/Documents/mlruns"

attr(,"class")
[1] "mlflow_server"

However, no other commands work and http://127.0.0.1:5000 is not accessible. If I switch to the terminal and run mlflow server --host 127.0.0.1 --port 8080, I get mlflow server --host 127.0.0.1 --port 8080, after which the UI is accessible.

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Just as a follow-up, I ran the following code:
Sys.setenv(MLFLOW_BIN=Sys.which("mlflow"))
Sys.setenv(MLFLOW_PYTHON_BIN=Sys.which("python"))

and verified using Sys.getenv() that these existed in the system environment, which they did. Running the following commands still resulted in the same error:

library(mlflow)
mlflow_client(tracking_uri = NULL)

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@acircleda Could you try if the python code works? Want to see if your tracking server breaks or it's R installation problem.

import mlflow

with mlflow.start_run():
    mlflow.log_param("test", "test")

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This seems to work. I did a fresh install into a venv-controlled environment on python 3.11.3

import mlflow
with mlflow.start_run():
... mlflow.log_param("test", "test")
...
'test'

I also ran this same python code in R Studio (via reticulate) and got the same result.

Tried the same command in R and got the same error reported in this ticket.

library(mlflow)
mlflow::mlflow_log_param("test", "test")

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What if you run R in terminal within the same python venv and try those R commands?

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Using the R -e '...' commands in the terminal, I get the same error as above.

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@mlflow/mlflow-team Please assign a maintainer and start triaging this issue.

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Let me know if there is any other information you would like me to provide.

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