tar_resources {targets}

Target resources

Description

Create a resources argument for tar_target() or tar_option_set().

Usage

tar_resources(
  aws = tar_option_get("resources")$aws,
  clustermq = tar_option_get("resources")$clustermq,
  crew = tar_option_get("resources")$crew,
  custom_format = tar_option_get("resources")$custom_format,
  feather = tar_option_get("resources")$feather,
  fst = tar_option_get("resources")$fst,
  future = tar_option_get("resources")$future,
  gcp = tar_option_get("resources")$gcp,
  network = tar_option_get("resources")$network,
  parquet = tar_option_get("resources")$parquet,
  qs = tar_option_get("resources")$qs,
  url = tar_option_get("resources")$url
)

Arguments

aws

Output of function tar_resources_aws(). Amazon Web Services (AWS) S3 storage settings for tar_target(..., repository = "aws"). See the cloud storage section of https://books.ropensci.org/targets/data.html for details for instructions.

clustermq

Output of function tar_resources_clustermq(). Optional clustermq settings for tar_make_clustermq(), including the log_worker and template arguments of clustermq::workers(). 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.

crew

Output of function tar_resources_crew() with target-specific settings for integration with the crew R package. These settings are arguments to the push() method of the controller or controller group object which control things like auto-scaling behavior and the controller to use in the case of a controller group.

custom_format

Output of function tar_resources_custom_format() with configuration details for tar_format() storage formats.

feather

Output of function tar_resources_feather(). Non-default arguments to arrow::read_feather() and arrow::write_feather() for arrow/feather-based storage formats. Applies to all formats ending with the "_feather" suffix. For details on formats, see the format argument of tar_target().

fst

Output of function tar_resources_fst(). Non-default arguments to fst::read_fst() and fst::write_fst() for fst-based storage formats. Applies to all formats ending with "fst" in the name. For details on formats, see the format argument of tar_target().

future

Output of function tar_resources_future(). Optional future settings for tar_make_future(), including the resources argument of future::future(), which can include values to insert in template placeholders in future.batchtools template files. This is how to supply the resources argument of future::future() for targets. Resources supplied through future::plan() and future::tweak() are completely ignored.

gcp

Output of function tar_resources_gcp(). Google Cloud Storage bucket settings for tar_target(..., repository = "gcp"). See the cloud storage section of https://books.ropensci.org/targets/data.html for details for instructions.

network

Output of function tar_resources_network(). Settings to configure how to handle unreliable network connections in the case of uploading, downloading, and checking data in situations that rely on network file systems or HTTP/HTTPS requests. Examples include retries and timeouts for internal storage management operations for storage = "worker" or format = "file" (on network file systems), format = "url", repository = "aws", and repository = "gcp". These settings do not apply to actions you take in the custom R command of the target.

parquet

Output of function tar_resources_parquet(). Non-default arguments to arrow::read_parquet() and arrow::write_parquet() for arrow/parquet-based storage formats. Applies to all formats ending with the "_parquet" suffix. For details on formats, see the format argument of tar_target().

qs

Output of function tar_resources_qs(). Non-default arguments to qs::qread() and qs::qsave() for qs-based storage formats. Applies to all formats ending with the "_qs" suffix. For details on formats, see the format argument of tar_target().

url

Output of function tar_resources_url(). Non-default settings for storage formats ending with the "_url" suffix. These settings include the curl handle for extra control over HTTP requests. For details on formats, see the format argument of tar_target().

Value

A list of objects of class "tar_resources" with non-default settings of various optional backends for data storage and high-performance computing.

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_aws(), tar_resources_clustermq(), 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(),
  format = "qs",
  resources = tar_resources(
    qs = tar_resources_qs(preset = "fast"),
    future = tar_resources_future(resources = list(n_cores = 1))
  )
)