Error: ‘inherits(future, "Future")’ is not TRUE #723
Comments
|
Sorry, I submitted this to the wrong repo. I guess I should have submitted to |
… "Future")' is not TRUE [#723]
I suspect your parallel worker crashes, because of the code you're running. That said, future should have given you another, more informative error message, but there is a typo/bug in future causing it to produce this error instead. I've fixed this in the develop branch. Can you please try by installing that version; if (requireNamespace("remotes")) install.packages("remotes")
remotes::install_github("HenrikBengtsson/future", ref="develop")
This is expected, because multisession futures inherits from cluster futures. Thanks |
|
Thanks for your response. Yes, the dev version does give a more helpful error now.
As to why that occurs, I am not sure. Do you? |
|
Thanks. Before troubleshooting further, could you make sure to update your R packages and retry, because several of your packages are outdated. It would be a waste of time to troubleshoot this just find out it has been fixed in some of the packages you use. |
|
Fair enough. I've done that and still get the same error. New session info: |
|
There was a little bit more information in one of the errors just now:
I'm not sure what the purpose of that message is, but this doesn't seem to be a lot of memory. |
|
That's just a clue, in case there are large objects. It'll save some back a forth, when troubleshooting. See if you can reproduce this with fewer workers, e.g. What is odd, is that something is changing the connection of the main R process, invalidating it, resulting it not being able to talk to the parallel worker. What is the code you're running? |
|
Yes it still happens with workers = 2.
How was your question meant to finish? "What is the code you're running..." |
|
Are you saying the code in #723 produces this error? If so, then there must be something else going on too, because I cannot see how that could happen. Do you have a custom ~/.Rprofile file? Can you reproduce it when you run R via |
Hi @HenrikBengtsson, yes that is the minimal code to reproduce the error and is also why I am extremely confused! I do not have a custom I was also wondering if this is an RStudio issue. However, I had a 2023 version of RStudio with this issue occurring, and it persisted when I updated to the latest version. |
|
@sebsilas Did you try to run the MRE in a plain R terminal (so not in RStudio)? |
After trying multiple times, I haven't been able to reproduce the exact error. When I load the app, I get this error though, seeming to correspond to when the app would crash:
So this could be it, will try and resolve. |
Well, including the PATH variable to include |
|
Thank you. I can reproduce this, by taking your original example and reload the Shiny page frequently enough. It has to do with library(shiny)
library(promises)
future::plan(future::multisession)This is what https://rstudio.github.io/promises/articles/promises_06_shiny.html uses. (*) Futureverse is design to detect when you set the same I'll look into it, but I cannot promise anything soon. |
|
Thanks @HenrikBengtsson, but I've already tried this and it still produces the error. |
|
Here's the script that I used to replicate this. I can reproduce it if I set the plan within library(shiny)
library(promises)
library(future)
## Here and it'll work
plan(multisession, workers = 2)
ui <- fluidPage(
titlePanel("Promise fail")
)
server <- function(input, output, session) {
## Not here! Because that will trigger the error
## plan(multisession, workers = 2)
res <- promises::future_promise({
Sys.sleep(5)
"test_res"
}, seed = NULL) %...>% (function(result) {
print(result)
})
}
# Run the application
app <- shinyApp(ui = ui, server = server)
print(app) |
|
Ok, but just to confirm, I do still get this in RStudio with your script: futures_debug_2.mov |
?!? That is definitely not something the Futureverse is producing. It looks like you have problems with your RStudio setup. I would start by verifying it works in vanilla |
I see that this is now a movie that you uploaded to GitHub. I guess I looked at it too soon, and I literally saw the text "Uploading futures_debug_2.mov…" here in the issue tracker. |
Describe the bug
When I try to load a promise in the context of starting up a Shiny app, I get the following error:
Error: ‘inherits(future, "Future")’ is not TRUEThis doesn't happen consistently.
The traceback (see below) is interesting. It suggests my promise is of cluster type, even though I have used plan(multisession). If I explicitly set the plan when calling
future_promise, I still get the same behaviour.Reproduce example
Expected behavior
I expect the promise not to fail.
Traceback
Session information
The text was updated successfully, but these errors were encountered: