[jira] [Resolved] (ARROW-12760) [C++][Python][R] S3FileSystem: IO thread parallelism limited to 8 threads

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-12760?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-12760.
------------------------------------
    Resolution: Fixed

Issue resolved by pull request 10316
[https://github.com/apache/arrow/pull/10316]

> [C++][Python][R] S3FileSystem: IO thread parallelism limited to 8 threads
> -------------------------------------------------------------------------
>
>                 Key: ARROW-12760
>                 URL: https://issues.apache.org/jira/browse/ARROW-12760
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++, Python, R
>    Affects Versions: 4.0.0
>            Reporter: Juan Galvez
>            Assignee: David Li
>            Priority: Major
>              Labels: filesystem, performance, pull-request-available
>             Fix For: 5.0.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> On Arrow 4, I'm not able to get more than 8 thread parallelism (for example when N threads call fs.ls() with different paths) for S3FileSystem created with pyarrow, because the default IO context is created with 8 thread limit (hardcoded), and I don't see a way to change this or pass a custom IO context through pyarrow APIs. I believe this affects other Arrow filesystem implementations as well.



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