[jira] [Updated] (ARROW-16178) [C++] Add a ThreadLocalState concept built on thread local

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-16178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-16178:
-----------------------------------
    Labels: pull-request-available  (was: )

> [C++] Add a ThreadLocalState concept built on thread local
> ----------------------------------------------------------
>
>                 Key: ARROW-16178
>                 URL: https://issues.apache.org/jira/browse/ARROW-16178
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: C++
>            Reporter: Weston Pace
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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.



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