Related to Issue #111, I'd like to suggest that you add a layer that detects when a forked process dies, which results in no results for parallel::mccollect(), and give an informative error message.
Example of the problem:
> library(BiocParallel)
> bplapply(1:2, FUN = function(x) quit("no"), BPPARAM = MulticoreParam(2L))
Error in result[[njob]] <- value :
attempt to select less than one element in OneIndex
2: In parallel::mccollect(wait = FALSE, timeout = 1) :
1 parallel job did not deliver a resultI do this in the future framework, where you get an error like:
> library(future)
> plan(multicore)
> f <- future(quit("no"))
> value(f)
Error: Failed to retrieve the result of MulticoreFuture (<none>) from the forked worker (on localhost; PID 17097). Post-mortem diagnostic: No process exists with this PID, i.e. the forked localhost worker is no longer alive.
In addition: Warning message:
In mccollect(jobs = jobs, wait = TRUE) :
1 parallel job did not deliver a result
Related to Issue #111, I'd like to suggest that you add a layer that detects when a forked process dies, which results in no results for
parallel::mccollect(), and give an informative error message.Example of the problem:
I do this in the future framework, where you get an error like: