Use 'parallel' package as suggest

[florisvdh]

Regarding the 'parallel' examples in the download_zenodo documenation. It appears that the package-import of parallel::mclapply doesn't help to execute first example. The parallel package must be loaded explicitly. Same holds for the parLapply anyway.

Further, note there's an error coming from stopCluster, which isn't imported.

Cf. below reprex. BTW, congrats for having solved most warnings!

library(zen4R)
download_zenodo("10.5281/zenodo.2547036", 
                parallel = TRUE,
                parallel_handler = mclapply,
                mc.cores = 2)
#> Warning in Sys.setlocale("LC_TIME", "us_US"): OS reports request to set locale
#> to "us_US" cannot be honored
#> [zen4R][INFO] ZenodoRecord - Download in parallel mode
#> Error in rec$downloadFiles(path = path, quiet = quiet, ...): object 'mclapply' not found
download_zenodo("10.5281/zenodo.2547036", 
                parallel = TRUE,
                parallel_handler = parLapply,
                cl = makeCluster(2))
#> Warning in Sys.setlocale("LC_TIME", "us_US"): OS reports request to set locale
#> to "us_US" cannot be honored
#> [zen4R][INFO] ZenodoRecord - Download in parallel mode
#> Error in rec$downloadFiles(path = path, quiet = quiet, ...): object 'parLapply' not found
download_zenodo("10.5281/zenodo.2547036", 
                parallel = TRUE,
                parallel_handler = parallel::mclapply,
                mc.cores = 2)
#> Warning in Sys.setlocale("LC_TIME", "us_US"): OS reports request to set locale
#> to "us_US" cannot be honored
#> [zen4R][INFO] ZenodoRecord - Download in parallel mode 
#> [zen4R][INFO] ZenodoRecord - Using non cluster-based (no cluster 'cl' argument specified) 
#> [zen4R][INFO] ZenodoRecord - Will download 2 files from record '4011667' (doi: '10.5281/zenodo.4011667') - total size: 72 KiB 
#> [zen4R][INFO] Files downloaded at '/tmp/Rtmp1ohh87/reprex2dd149277a26'.
#> [zen4R][INFO] ZenodoRecord - Verifying file integrity... 
#> [zen4R][INFO] File 'zen4R-0.4.tar.gz': integrity verified (md5sum: e36420deeaf30ebd25fd74dfdcf6d7cd)
#> [zen4R][INFO] File 'zen4R-0.4.zip': integrity verified (md5sum: 5fa140b3837c315bfc9733813b152fd3)
#> [zen4R][INFO] ZenodoRecord - End of download
download_zenodo("10.5281/zenodo.2547036", 
                parallel = TRUE,
                parallel_handler = parallel::parLapply,
                cl = parallel::makeCluster(2))
#> Warning in Sys.setlocale("LC_TIME", "us_US"): OS reports request to set locale
#> to "us_US" cannot be honored
#> [zen4R][INFO] ZenodoRecord - Download in parallel mode 
#> [zen4R][INFO] ZenodoRecord - Using cluster-based parallel handler (cluster 'cl' argument specified) 
#> [zen4R][INFO] ZenodoRecord - Will download 2 files from record '4011667' (doi: '10.5281/zenodo.4011667') - total size: 72 KiB 
#> Error in stopCluster(cl) : could not find function "stopCluster"
#> [zen4R][INFO] Files downloaded at '/tmp/Rtmp1ohh87/reprex2dd149277a26'.
#> [zen4R][INFO] ZenodoRecord - Verifying file integrity... 
#> [zen4R][INFO] File 'zen4R-0.4.tar.gz': integrity verified (md5sum: e36420deeaf30ebd25fd74dfdcf6d7cd)
#> [zen4R][INFO] File 'zen4R-0.4.zip': integrity verified (md5sum: 5fa140b3837c315bfc9733813b152fd3)
#> [zen4R][INFO] ZenodoRecord - End of download

^{Created on 2020-09-03 by the reprex package (v0.3.0)}

Session info

devtools::session_info()
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[eblondel]

Available in CRAN (zen4R 0.4-2)