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Posted to issues@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2018/06/27 20:35:00 UTC
[jira] [Assigned] (ARROW-2683) [Python] Resource Warning (Unclosed
File) when using pyarrow.parquet.read_table()
[ https://issues.apache.org/jira/browse/ARROW-2683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney reassigned ARROW-2683:
-----------------------------------
Assignee: Krisztian Szucs
> [Python] Resource Warning (Unclosed File) when using pyarrow.parquet.read_table()
> ---------------------------------------------------------------------------------
>
> Key: ARROW-2683
> URL: https://issues.apache.org/jira/browse/ARROW-2683
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.9.0
> Reporter: Aldrin
> Assignee: Krisztian Szucs
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.10.0
>
> Attachments: parquetread_test.py, simple.parquet
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> pyarrow version from python repl:
> {noformat}
> >>> import pyarrow
> >>> pyarrow.__version__
> '0.9.0.post1'{noformat}
> python interpreter information:
> {noformat}
> Python 3.6.5 (default, Mar 30 2018, 06:42:10)
> [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.39.2)] on darwin{noformat}
> arbitrary, potentially relevant system information:
> {noformat}
> OS : macOS High Sierra (10.13.4)
> homebrew package : python: stable 3.6.5 (bottled), devel 3.7.0b4, HEAD
> pip version : pip 10.0.1
> pipenv version : pipenv, version 2018.05.18
> pyarrow version (via pip): pyarrow 0.9.0.post1
> cython version (via pip) : Cython 0.28.2{noformat}
>
> Issue Description:
> I see a ResourceWarning, which doesn't seem to be an error, but seems important enough (a.k.a. annoying enough) that I thought it would be worth asking about. [~xhochy] was nice enough to respond in #general in the arrow slack.
> The main problem is as follows:
> # with this code in a python unittest:
> {noformat}
> def test_arrow_from_parquet(self):
> table = parquet.read_table(<path as str>){noformat}
> I see this warning:
> {noformat}
> ResourceWarning: unclosed file <_io.BufferedReader name=<path_to_file>{noformat}
> # I tried adding the following, per Uwe's request:
> {noformat}
> warnings.simplefilter("error"){noformat}
> # I then see this information:
> {noformat}
> test_arrow_from_parquet (tests.datalayer_test.TestFileReader) ... Exception ignored in: <_io.FileIO name=<path_to_file> mode='rb' closefd=True>
> ResourceWarning: unclosed file <_io.BufferedReader name=<path_to_file>>{noformat}
> # Uwe's thoughts:
> {noformat}
> That could be a valid error. We don’t seem to close the file we open in `ParquetFile.__init__`{noformat}
>
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