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Posted to issues@arrow.apache.org by "Anshul Kanakia (Jira)" <ji...@apache.org> on 2022/09/29 21:57:00 UTC
[jira] [Created] (ARROW-17898) pyarrow.parquet.read_table fs (filesystem) argument does not work with fsspec.implementations.arrow.ArrowFSWrapper objects
Anshul Kanakia created ARROW-17898:
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Summary: pyarrow.parquet.read_table fs (filesystem) argument does not work with fsspec.implementations.arrow.ArrowFSWrapper objects
Key: ARROW-17898
URL: https://issues.apache.org/jira/browse/ARROW-17898
Project: Apache Arrow
Issue Type: Bug
Components: Parquet, Python
Affects Versions: 8.0.1
Environment: Python 3.8.10
Reporter: Anshul Kanakia
Fix For: 8.0.2
My version of PyArrow=8.0.0. When I attempt to use a PyArrow LocalFileSystem object wrapped with ArrowFSWrapper it results in the following error:
import pyarrow as pa
import pyarrow.parquet as pq
from fsspec.implementations.arrow import ArrowFSWrapper
{quote}lfs = pa.fs.LocalFileSystem()
fs = ArrowFSWrapper(lfs)
pat = pq.read_table("some/file/location.parquet", filesystem=fs)
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{{OSError Traceback (most recent call last) Cell In [12], line 1 ----> 1 pat = pq.read_table( *2* "some/file/location.parquet", *3* filesystem=fs) File /usr/local/lib/python3.8/dist-packages/pyarrow/parquet/__init__.py:2737, in read_table(source, columns, use_threads, metadata, schema, use_pandas_metadata, memory_map, read_dictionary, filesystem, filters, buffer_size, partitioning, use_legacy_dataset, ignore_prefixes, pre_buffer, coerce_int96_timestamp_unit, decryption_properties) *2730* raise ValueError( *2731* "The 'metadata' keyword is no longer supported with the new " *2732* "datasets-based implementation. Specify " *2733* "'use_legacy_dataset=True' to temporarily recover the old " *2734* "behaviour." *2735* ) *2736* try: -> 2737 dataset = _ParquetDatasetV2( *2738* source, *2739* schema=schema, *2740* filesystem=filesystem, *2741* partitioning=partitioning, *2742* memory_map=memory_map, *2743* read_dictionary=read_dictionary, *2744* buffer_size=buffer_size, *2745* filters=filters, *2746* ignore_prefixes=ignore_prefixes,}}
...
File /usr/local/lib/python3.8/dist-packages/pyarrow/io.pxi:193, in pyarrow.lib.NativeFile.get_random_access_file() File /usr/local/lib/python3.8/dist-packages/pyarrow/io.pxi:222, in pyarrow.lib.NativeFile._assert_seekable() OSError: only valid on seekable files{quote}
If I instead use just the LocalFileSystem object without the ArrowFSWrapper, it works as expected.
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