Export Objects to the Slaves

Objects are saved in subdirectory “exports” of the “file.dir” of reg. They are automatically loaded and placed in the global environment each time the registry is loaded or a job collection is executed.

batchExport(
  export = list(),
  unexport = character(0L),
  reg = getDefaultRegistry()
)

Arguments

export	[list] Named list of objects to export.
unexport	[character] Vector of object names to unexport.
reg	[Registry] Registry. If not explicitly passed, uses the default registry (see setDefaultRegistry).

Value

[data.table] with name and uri to the exported objects.

Examples

 batchtools:::example_push_temp(1) 
tmp = makeRegistry(file.dir = NA, make.default = FALSE)
#> No readable configuration file found
#> Created registry in '/tmp/batchtools-example/reg' using cluster functions 'Interactive'

# list exports
exports = batchExport(reg = tmp)
print(exports)
#> Empty data.table (0 rows and 2 cols): name,uri

# add a job and required exports
batchMap(function(x) x^2 + y + z, x = 1:3, reg = tmp)
#> Adding 3 jobs ...
exports = batchExport(export = list(y = 99, z = 1), reg = tmp)
#> Exporting new objects: 'y','z' ...
print(exports)
#>    name                                        uri
#> 1:    y /tmp/batchtools-example/reg/exports/PE.rds
#> 2:    z /tmp/batchtools-example/reg/exports/PI.rds

submitJobs(reg = tmp)
#> Submitting 3 jobs in 3 chunks using cluster functions 'Interactive' ...
waitForJobs(reg = tmp)
#> [1] TRUE
stopifnot(loadResult(1, reg = tmp) == 101)

# Un-export z
exports = batchExport(unexport = "z", reg = tmp)
#> Un-exporting exported objects: 'z' ...
print(exports)
#>    name                                        uri
#> 1:    y /tmp/batchtools-example/reg/exports/PE.rds