arrow-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Matthew Rocklin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ARROW-434) Segfaults and encoding issues in Python Parquet reads
Date Thu, 22 Dec 2016 15:09:58 GMT

    [ https://issues.apache.org/jira/browse/ARROW-434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15770242#comment-15770242
] 

Matthew Rocklin commented on ARROW-434:
---------------------------------------

Cool, verified that it works on my end.  The airlines data on s3fs is still failing with an
encoding error.  I've been having difficulty managing permissions on S3 to make this publicly
available (just ignorance on my part).  In the mean time, here's the status of the files in
the "parquet compatibility project"

{code}
In [1]: import pyarrow.parquet

In [2]: from glob import glob

In [3]: filenames = sorted(glob('*.parquet'))

In [4]: filenames
Out[4]: 
['customer.impala.parquet',
 'foo.parquet',
 'gzip-nation.impala.parquet',
 'nation.dict.parquet',
 'nation.impala.parquet',
 'nation.plain.parquet',
 'snappy-nation.impala.parquet',
 'test-converted-type-null.parquet',
 'test-null-dictionary.parquet',
 'test-null.parquet',
 'test.parquet']

In [5]: for fn in filenames:
   ...:     try:
   ...:         t = pyarrow.parquet.read_table(fn)
   ...:     except Exception as e:
   ...:         print('Failed on', fn, e)
   ...:     else:
   ...:         print("Succeeded on", fn)
   ...:         
   ...:     
Succeeded on customer.impala.parquet
Succeeded on foo.parquet
Succeeded on gzip-nation.impala.parquet
Failed on nation.dict.parquet IOError: Unexpected end of stream.
Succeeded on nation.impala.parquet
Succeeded on nation.plain.parquet
Succeeded on snappy-nation.impala.parquet
Succeeded on test-converted-type-null.parquet
Succeeded on test-null-dictionary.parquet
Succeeded on test-null.parquet
Succeeded on test.parquet

In [6]: pyarrow.parquet.read_table('nation.dict.parquet')
---------------------------------------------------------------------------
ArrowException                            Traceback (most recent call last)
<ipython-input-6-5c2e833b21a9> in <module>()
----> 1 pyarrow.parquet.read_table('nation.dict.parquet')

/home/mrocklin/Software/anaconda/envs/arrow-test/lib/python3.5/site-packages/pyarrow/parquet.pyx
in pyarrow.parquet.read_table (/feedstock_root/build_artefacts/work/arrow-268ffbeffb1cd0617e52d381d500a2d10f61124c/python/build/temp.linux-x86_64-3.5/parquet.cxx:2907)()

/home/mrocklin/Software/anaconda/envs/arrow-test/lib/python3.5/site-packages/pyarrow/parquet.pyx
in pyarrow.parquet.ParquetReader.read_all (/feedstock_root/build_artefacts/work/arrow-268ffbeffb1cd0617e52d381d500a2d10f61124c/python/build/temp.linux-x86_64-3.5/parquet.cxx:2275)()

/home/mrocklin/Software/anaconda/envs/arrow-test/lib/python3.5/site-packages/pyarrow/error.pyx
in pyarrow.error.check_status (/feedstock_root/build_artefacts/work/arrow-268ffbeffb1cd0617e52d381d500a2d10f61124c/python/build/temp.linux-x86_64-3.5/error.cxx:1197)()

ArrowException: IOError: Unexpected end of stream.
{code}

> Segfaults and encoding issues in Python Parquet reads
> -----------------------------------------------------
>
>                 Key: ARROW-434
>                 URL: https://issues.apache.org/jira/browse/ARROW-434
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>         Environment: Ubuntu, Python 3.5, installed pyarrow from conda-forge
>            Reporter: Matthew Rocklin
>            Assignee: Wes McKinney
>            Priority: Minor
>              Labels: parquet, python
>
> I've conda installed pyarrow and am trying to read data from the parquet-compatibility
project.  I haven't explicitly built parquet-cpp or anything and may or may not have old versions
lying around, so please take this issue with some salt:
> {code:python}
> In [1]: import pyarrow.parquet
> In [2]: t = pyarrow.parquet.read_table('nation.plain.parquet')
> ---------------------------------------------------------------------------
> ArrowException                            Traceback (most recent call last)
> <ipython-input-2-5d966681a384> in <module>()
> ----> 1 t = pyarrow.parquet.read_table('nation.plain.parquet')
> /home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/parquet.pyx in pyarrow.parquet.read_table
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/parquet.cxx:2783)()
> /home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/parquet.pyx in pyarrow.parquet.ParquetReader.read_all
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/parquet.cxx:2200)()
> /home/mrocklin/Software/anaconda/lib/python3.5/site-packages/pyarrow/error.pyx in pyarrow.error.check_status
(/feedstock_root/build_artefacts/work/arrow-79344b335849c2eb43954b0751018051814019d6/python/build/temp.linux-x86_64-3.5/error.cxx:1185)()
> ArrowException: NotImplemented: list<: uint8>
> {code}
> Additionally I tried to read data from a Python file-like object pointing to data on
S3.  Let me know if you'd prefer a separate issue.
> {code:python}
> In [1]: import s3fs
> In [2]: fs = s3fs.S3FileSystem()
> In [3]: f = fs.open('dask-data/nyc-taxi/2015/parquet/part.0.parquet')
> In [4]: f.read(100)
> Out[4]: b'PAR1\x15\x00\x15\x90\xc4\xa2\x12\x15\x90\xc4\xa2\x12,\x15\xc2\xa8\xa4\x02\x15\x00\x15\x06\x15\x08\x00\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00\x00\x80\xbf\xe7\x8b\x0b\x05\x00@\xc2\xce\xe7\x8b\x0b\x05\x00\xc0F\xed\xe7\x8b\x0b\x05\x00\xc0F\xed\xe7\x8b\x0b\x05\x00\x00\x89\xfc\xe7\x8b\x0b\x05\x00@\xcb\x0b\xe8\x8b\x0b\x05\x00\x80\r\x1b\xe8\x8b\x0b'
> In [5]: import pyarrow.parquet
> In [6]: t = pyarrow.parquet.read_table(f)
> Segmentation fault (core dumped)
> {code}
> Here is a more reproducible version:
> {code:python}
> In [1]: with open('nation.plain.parquet', 'rb') as f:
>    ...:     data = f.read()
>    ...:     
> In [2]: from io import BytesIO
> In [3]: f = BytesIO(data)
> In [4]: f.seek(0)
> Out[4]: 0
> In [5]: import pyarrow.parquet
> In [6]: t = pyarrow.parquet.read_table(f)
> Segmentation fault (core dumped)
> {code}
> I was however pleased with round-trip functionality within this project, which was very
pleasant.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message