[ARROW-15941] [C++] Allow setting IO thread pool size with an environment variable

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.0.0
• Component/s: C++
• Labels: good-second-issue pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/31368
• Assignee: Antoine Pitrou
• Reporter: Antoine Pitrou
• Created: 15/Mar/22 16:13
• Updated: 11/Jan/23 11:40
• Resolved: 21/Mar/22 13:39

Description

See https://issues.apache.org/jira/browse/ARROW-14354 and https://github.com/apache/arrow/pull/12624#discussion_r827088337 for discussion.

Issue Links

• is related to: ARROW-14354 [C++] Investigate reducing I/O thread pool size to avoid CPU wastage.
• links to: GitHub Pull Request #12646