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https://issues.apache.org/jira/browse/ARROW-14925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17451357#comment-17451357
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Weston Pace commented on ARROW-14925:
-------------------------------------

I think the deprecation message could be improved.  One might think it means 
"This is deprecated and instead you should open an output stream for appending" 
 (e.g. X is deprecated, do Y).

We should use wording similar to what is in the C++:

{quote}Deprecated in 6.0.0. OpenAppendStream is unsupported on several 
filesystems and will be later removed.{quote}

> [C++] HadoopFileSystem.open_append_stream not implemented correctly
> -------------------------------------------------------------------
>
>                 Key: ARROW-14925
>                 URL: https://issues.apache.org/jira/browse/ARROW-14925
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Python
>    Affects Versions: 6.0.1
>            Reporter: wondertx
>            Priority: Major
>
> `pyarrow.fs.HadooFileSystem.open_append_stream`  does not create an empty 
> file if the target doesn't exist. Plus, doc string of `append_stream` says 
> that 
> > DEPRECATED: Open an output stream for appending.
> But `open_output_stream' does not have open mode paramater



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