Adam Shirey created PARQUET-1888:
------------------------------------
Summary: 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
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?
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
