[R-pkg-devel] "Connections left open" Error

[Uwe Ligges]

On 23.08.2021 18:07, Alan Aw wrote:
> Hi,
> 
> I submitted a package to CRAN, but it keeps failing a particular check for
> Windows. This error shows up when I check my code examples.
> 
> Error: connections left open:
>>          <-CRANwin.fb05.statistik.uni-dortmund.de:11602
>> <http://cranwin.fb05.statistik.uni-dortmund.de:11602/> (sockconn)
>>          <-CRANwin.fb05.statistik.uni-dortmund.de:11602
>> <http://cranwin.fb05.statistik.uni-dortmund.de:11602/> (sockconn)
>> Execution halted
> 
> 
> For context, my code example does the following.
> 
> suppressWarnings(require(doParallel))
>> registerDoParallel(cores = 2)
>>
> 
> 
> # Some code examples that use foreach and %dopar%
> 
> 
> 
> stopImplicitCluster()
> 
> 
> Other contextual information:
> 
>     - I already import doParallel in the DESCRIPTION file.
>     - My package passes all checks on the Linux machine.
> 
> I have read elsewhere (e.g., this thread
> <https://github.com/HenrikBengtsson/future/issues/327>) that examples with
> parallelization lead to this error. However stopImplicitCluster() does not
> seem to fix it.
> 
> Could someone familiar with this please troubleshoot? Thank you.

No idea about the doParallel package, but perhaps it helps to open a 
cluster explicitly and in the end stop exactly that cluster?

Best,
Uwe Ligges
> 
> Alan
> 
> 	[[alternative HTML version deleted]]
> 
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