[ARROW-5502] [R] file readers should mmap

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Fix Version/s: 0.16.0
• Component/s: R
• External issue URL: https://github.com/apache/arrow/issues/21950
• Assignee: Unassigned
• Reporter: Neal Richardson
• Created: 03/Jun/19 22:52
• Updated: 11/Jan/23 07:40
• Resolved: 10/Oct/19 22:34

Description

Arrow is supposed to let you work with datasets bigger than memory. Memory mapping is a big part of that. It should be the default way that files are read in the `read_*` functions. To disable memory mapping, we could use a global `option()`, or a function argument, but that might clutter the interface. Or we could not give a choice and only fall back to not memory mapping if the platform/file system doesn't support it.