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https://issues.apache.org/jira/browse/ARROW-7867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney updated ARROW-7867:
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Fix Version/s: 1.0.0
> [Python] ArrowIOError: Invalid Parquet file size is 0 bytes on reading from S3
> ------------------------------------------------------------------------------
>
> Key: ARROW-7867
> URL: https://issues.apache.org/jira/browse/ARROW-7867
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.15.1, 0.16.0
> Reporter: Vladimir
> Priority: Major
> Fix For: 1.0.0
>
>
> I'm not sure if this issue belongs here or to S3FS library.
> The error occurs when reading from partitioned parquet from S3, in case when
> the "root folder" of the parquet was created manually before writing the
> parquet there.
> I.e. the steps to reproduce:
>
> {code:java}
> # 1. Create "folder" s3://bucket.name/data.parquet in e.g. cyberduck app
> # 2. Write
> table = pa.Table.from_pandas(df)
> pq.write_table(table, 's3://bucket.name/data.parquet', partition_cols=[],
> filesystem=s3fs.S3FileSystem())
> # 3. Read
> pq.read_table('s3://bucket.name/data.parquet', filesystem=s3fs.S3FileSystem())
> # ArrowIOError: Invalid Parquet file size is 0 bytes{code}
> In case when the table was partitioned by a non-empty set of columns, an
> error reads: "ValueError: Found files in an intermediate directory".
> This is likely due to the fact that S3 does not have "folders" per-se, and
> various software "mimic" creation of empty folder by writing an empty
> (zero-size) object to S3. So the parquet confuses this object with the actual
> contents of the parquet file.
> At the same time s3fs library correctly identifies the key as a folder:
> {code:java}
> s3fs.S3FileSystem().isdir('s3://bucket.name/data.parquet') # Returns True
> {code}
>
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