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https://issues.apache.org/jira/browse/ARROW-11000?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253047#comment-17253047
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Maarten Breddels commented on ARROW-11000:
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did you check with passing `default_fill_cache=False` and
`default_block_size=1` to the s3fs ctor? I think it by default does too many
smart things.
> [Python] Enable random access reading for Python file objects (if supported)
> ----------------------------------------------------------------------------
>
> Key: ARROW-11000
> URL: https://issues.apache.org/jira/browse/ARROW-11000
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Joris Van den Bossche
> Priority: Major
>
> {{arrow::py::PyReadableFile::ReadAt}} is being commented as thread-safe (it
> puts a lock on the underlying python file) and should thus allow random
> access in parallel code (for example, reading a subset (eg column) of a
> parquet file).
> However, based on experimentation, it seems this doesn't work (eg with s3fs
> filesystem to read a specific parquet column
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