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https://issues.apache.org/jira/browse/PARQUET-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166259#comment-17166259
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Gabor Szadovszky commented on PARQUET-1888:
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I guess this issue is about the rust implementation of parquet (parquet-rs).
Based on the
[README|https://github.com/sunchao/parquet-rs/blob/master/README.md] it is
moved to Arrow so you should create a jira
[there|https://issues.apache.org/jira/projects/ARROW/issues].
> Provide guidance on number of file descriptors needed to read Parquet file
> --------------------------------------------------------------------------
>
> Key: PARQUET-1888
> URL: https://issues.apache.org/jira/browse/PARQUET-1888
> Project: Parquet
> Issue Type: Task
> Environment: {code:bash}
> $ rustc --version
> rustc 1.47.0-nightly (6c8927b0c 2020-07-26)
> {code}
> Cargo.toml:
> {code:yaml}
> [dependencies]
> parquet = "0.17"
> rayon = "1.1"
> ...
> {code}
> Reporter: Adam Shirey
> Priority: Trivial
>
> I have a series of Parquet files that are 181 columns wide, and I'm
> processing them in parallel (using
> [rayon|https://github.com/rayon-rs/rayon/]). I ran into the OS limit (default
> 1024 according to {{ulimit -n}}) of open file descriptors when doing this,
> but each file was consuming 208 descriptors.
> Is there a deterministic calculation for how many file descriptors will be
> used to process files so that one can determine appropriate multithreading in
> a situation like this?
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