Juan Galvez created ARROW-12760:
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             Summary: [Python] 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
    Affects Versions: 4.0.0
            Reporter: Juan Galvez


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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