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https://issues.apache.org/jira/browse/ARROW-3916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16704862#comment-16704862
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Wes McKinney commented on ARROW-3916:
-------------------------------------
Sounds fine to me, would you like to open a pull request?
> [Python] Support caller-provided filesystem in `ParquetWriter` constructor
> --------------------------------------------------------------------------
>
> Key: ARROW-3916
> URL: https://issues.apache.org/jira/browse/ARROW-3916
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Affects Versions: 0.11.1
> Reporter: Mackenzie
> Priority: Major
> Labels: parquet
> Fix For: 0.13.0
>
>
> Currently to write files incrementally to S3, the following pattern appears
> necessary:
> {{def write_dfs_to_s3(dfs, fname):}}
> {{ first_df = dfs[0]}}
> {{ table = pa.Table.from_pandas(first_df, preserve_index=False)}}
> {{ fs = s3fs.S3FileSystem()}}
> {{ fh = fs.open(fname, 'wb')}}
> {{ with pq.ParquetWriter(fh, table.schema) as writer:}}
> {{ # set file handle on writer so writer manages closing it when it
> is itself closed}}
> {{ writer.file_handle = fh}}
> {{ writer.write_table(table=table)}}
> {{ for df in dfs[1:]:}}
> {{ table = pa.Table.from_pandas(df, preserve_index=False)}}
> {{ writer.write_table(table=table)}}
> This works as expected, but is quite roundabout. It would be much easier if
> `ParquetWriter` supported `filesystem` as a keyword argument in its
> constructor, in which case the `_get_fs_from_path` would be overriden by the
> usual pattern of using the kwarg after ensuring it is a proper file system
> with `_ensure_filesystem`.
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