tar_resources_fst: Target resources: 'fst' storage formats

In wlandau/targets: Dynamic Function-Oriented 'Make'-Like Declarative Pipelines

Target resources: fst storage formats

Description

Create the fst argument of tar_resources() to specify optional settings for big data frame storage formats powered by the fst R package. See the format argument of tar_target() for details.

Usage

tar_resources_fst(compress = targets::tar_option_get("resources")$fst$compress)

Arguments

compress

Numeric of length 1, compress argument of fst::write_fst(). Defaults to 50.

Value

Object of class "tar_resources_fst", to be supplied to the fst 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_clustermq(), tar_resources_crew(), tar_resources_custom_format(), tar_resources_feather(), 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 = "fst_tbl",
  resources = tar_resources(
    fst = tar_resources_fst(compress = 100)
  )
)

wlandau/targets documentation built on May 1, 2024, 7:27 p.m.