# furrr 0.2.1 2020-10-21

• Updated documentation examples to explicitly set the seed on the workers when random numbers are generated (#175).

• Removed an internal call to future:::supportsMulticore() since it is no longer internal (#174).

# furrr 0.2.0 2020-10-12

## Breaking changes:

• All furrr functions now enforce tidyverse recycling rules (for example, between .x and .y in future_map2()). Previously this was mostly the case, except with size zero input. Recycling between input of size 0 and input of size >1 no longer recycles to size 0, and is instead an error. purrr will begin to do this as well in the next major release (#134).

• future_options() has been deprecated in favor of furrr_options(). Calling future_options() will still work, but will trigger a once per session warning and will eventually be removed. This change was made to free up this function name in case the future package ever wants to use it.

• In a future version of furrr, the .progress argument will be deprecated and removed in favor of the progressr package. The progress bar has not yet been removed in furrr 0.2.0, however I would encourage you to please start using progressr if possible. It uses a much more robust idea, and has been integrated with future in such a way that it can relay near real-time progress updates from sequential, multisession, and even cluster futures (meaning that remote connections can return live updates). Multicore support will come at some point as well. That said, be aware that it is a relatively new package and the API is still stabilizing. As more people use it, its place in the future ecosystem will become clearer, and tighter integration with furrr will likely be possible.

## Features / Fixes:

• New pkgdown article on using furrr with progressr for generating progress updates.

• New pkgdown article discussing an alternative strategy to automatic globals detection using the carrier package.

• New pkgdown article discussing how furrr “chunks” input to send if off to workers.

• New pkgdown article on common gotchas when using furrr.

• New pkgdown article detailing how to use furrr with remote AWS EC2 connections.

• future_walk() and friends have been added to mirror purrr::walk().

• furrr_options() now has a variety of new arguments for fine tuning furrr. These are based on advancements made in both future and future.apply. The most important is chunk_size, which can be used as an alternative to scheduling to determine how to break up .x into chunks to send off to the workers. See ?furrr_options for full details.

• future_pmap() and its variants now propagate the names of the first element of .l onto the output (#116).

• future_pmap() and its variants now work with empty list() input (#135).

• future_modify(), future_modify_if() and future_modify_at() have been brought up to date with the changes in purrr 0.3.0 to their non-parallel equivalents. Specifically, they now wrap [[<- and return the same type as the input when the input is an atomic vector (#119).

• future_map_if() and future_modify_if() gained the .else argument that was added to purrr’s map_if() and modify_if() in purrr 0.3.0 (#132).

• All *_raw() variants from purrr have been added, such as future_map_raw() (#122).

• All furrr functions gained a new argument, .env_globals, which determines the environment in which globals for .x and ... are looked up. It defaults to the caller environment, which is different than what was previously used, but should be more correct in some edge cases. Most of the time, you should not have to touch this argument. Additionally, globals for .f are now looked up in the function environment of .f (HenrikBengtsson/future.apply#62, #153).

• The future specific global option future.globals.maxSize now scales with the number of elements of .x that get exported to each worker. This helps prevent some false positives about exporting objects that are too large, and is the same approach taken in future.apply (#113).

• .x is now searched for globals. Only globals found in the slice of .x that corresponds to worker X are exported to worker X. This is relevant if .x is, say, a list of functions where each has their own set of globals (#16).

• The progress bar furrr creates now outputs to stderr rather than stdout.

• The progress bar is now only enabled for multisession, multicore, and multiprocess strategies. It has never worked for sequential futures or cluster futures using remote connections, but .progress is now forced to false in those cases.

• future_invoke_map() and its variants have been marked as retired to match purrr::invoke_map().

• The internals of furrr have been overhauled to unify the implementations of future_map(), future_map2(), future_pmap() and all of their variants. This should make furrr much easier to maintain going forward (#44).

• A MIT license is now used.

## Version requirements:

• rlang >= 0.3.0 is now required to ensure that the rlang ~ is serializable. The hacks in furrr that tried to work around this have been removed (#123).

• future >= 1.19.1 is now required to be able to use future::value() instead of the soon to be deprecated future::values() and to access a few bug fixes (#108).

• purrr >= 0.3.0 is now required to gain access to various new features and breaking changes. For example, map_if() gained an .else argument, which has been added to future_map_if().

• globals >= 0.13.1 is now required because of substantial new speed boosts there related to searching for global variables, and to gain access to a few bug fixes.

# furrr 0.1.0 2018-05-16

Features:

• future_pmap_*() functions have been added to mirror pmap().

• The future.* arguments to each function have been replaced with an overarching .options argument. Use future_options() to create a set of options suitable to be passed to .options. This change streamlines the interface greatly, and simplifies documentation (#8, @hadley).

• future_invoke_map_*() functions have been added to mirror invoke_map().

• More documentation and examples have been added.

• Added the ability to use a progress bar with .progress = TRUE for multicore, multiprocess, and multisession plan()s.

Bug Fixes:

• Fixed a bug with using ~ inside a mutate() + map() combination.

• Added a missed future_imap_int().

# furrr 0.0.0 Unreleased

• Original GitHub release of furrr on 2018-04-13.