tar_resources_clustermq {targets}

Target resources: clustermq high-performance computing

Description

Create the clustermq argument of tar_resources() to specify optional high-performance computing settings for tar_make_clustermq(). For details, see the documentation of the clustermq R package and the corresponding argument names in this help file.

Usage

tar_resources_clustermq(
  template = targets::tar_option_get("resources")$clustermq$template
)

Arguments

template

Named list, template argument to clustermq::workers(). Defaults to an empty list.

Details

clustermq workers are persistent, so there is not a one-to-one correspondence between workers and targets. The clustermq resources apply to the workers, not the targets. So the correct way to assign clustermq resources is through tar_option_set(), not tar_target(). clustermq resources in individual tar_target() calls will be ignored.

Value

Object of class "tar_resources_clustermq", to be supplied to the clustermq argument of tar_resources().

Resources

Functions tar_target() and tar_option_set() each takes an optional resources argument to supply non-default settings of various optional backends for data storage and high-performance computing. The tar_resources() function is a helper to supply those settings in the correct manner.

In targets version 0.12.2 and above, resources are inherited one-by-one in nested fashion from tar_option_get("resources"). For example, suppose you set tar_option_set(resources = tar_resources(aws = my_aws)), where my_aws equals tar_resources_aws(bucket = "x", prefix = "y"). Then, ⁠tar_target(data, get_data()⁠ will have bucket "x" and prefix "y". In addition, if new_resources equals ⁠tar_resources(aws = tar_resources_aws(bucket = "z")))⁠, then tar_target(data, get_data(), resources = new_resources) will use the new bucket "z", but it will still use the prefix "y" supplied through tar_option_set(). (In targets 0.12.1 and below, options like prefix do not carry over from tar_option_set() if you supply non-default resources to tar_target().)

See Also

Other resources: tar_resources(), tar_resources_aws(), tar_resources_crew(), tar_resources_custom_format(), tar_resources_feather(), tar_resources_fst(), tar_resources_future(), tar_resources_gcp(), tar_resources_network(), tar_resources_parquet(), tar_resources_qs(), tar_resources_url()

Examples

# Somewhere in you target script file (usually _targets.R):
tar_target(
  name,
  command(),
  resources = tar_resources(
    clustermq = tar_resources_clustermq(template = list(n_cores = 2))
  )
)