parallel::clusterExport - non exported library/package function

Question

But how do I clusterExport a package's non-exported function to a cluster? For some reason this passed my tests before submitting to CRAN but isn't working in production. Obviously, I want to fix and resubmit to CRAN.

library(imputeMulti)
library(parallel)
imputeMulti:::count_compare # function to be exported

nnodes <- 2L
cl <- parallel::makeCluster(nnodes)    

parallel::clusterExport(cl, varlist= c("count_compare")) # fails -- but initially passed tests
parallel::clusterExport(cl, varlist= c("count_compare"), envir= as.environment("package:imputeMulti")) # also fails

I'm using cluster export to avoid the CRAN/R CMD check note "use of ::: in package". Obviously, I could export count_compare, but that's not a desirable choice.

Any help appreciated!

adding tests information:

devtools::test("imputeMulti", "count_levels")
Loading imputeMulti
Testing imputeMulti
int- count_levels works: ...............................

DONE ===========================================================================================================================================

Jim Jim · Accepted Answer · 2017-04-28T18:51:03

You can use an equivalent call to clusterCall to do this.

parallel::clusterCall(cl, assign, "count_compare", count_compare, envir = .GlobalEnv)

See the definition of clusterExport to verify this is doing the same thing.

parallel::clusterExport - non exported library/package function

adding tests information:

2 Answers