[ARROW-16178] [C++] Add a ThreadLocalState concept built on thread local

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/31581
• Assignee: Unassigned
• Reporter: Weston Pace
• Created: 13/Apr/22 04:21
• Updated: 11/Jan/23 11:42

Description

The ThreadLocalState is tied to an executor and, on creation, creates a state for every thread in the executor. In order to quickly access a particular thread's state we need a way to get a thread index (the index of the thread in the executor). Historically we used ThreadIndexer and this JIRA introduces a new approach using thread local.

Similar to the ThreadIndexer this thread local state concept will fail when the capacity is resized during a run.

Similar to the ThreadIndexer this concept won't work too well for serial execution until ARROW-15732 is resolved.

Issue Links

• links to: GitHub Pull Request #12871