[jira] [Resolved] (ARROW-5019) [C#] ArrowStreamWriter doesn't work on a non-seekable stream

["Kouhei Sutou (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-5019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kouhei Sutou resolved ARROW-5019.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.14.0

Issue resolved by pull request 4052
[https://github.com/apache/arrow/pull/4052]

> [C#] ArrowStreamWriter doesn't work on a non-seekable stream
> ------------------------------------------------------------
>
>                 Key: ARROW-5019
>                 URL: https://issues.apache.org/jira/browse/ARROW-5019
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C#
>            Reporter: Eric Erhardt
>            Assignee: Eric Erhardt
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.14.0
>
>   Original Estimate: 48h
>          Time Spent: 26.5h
>  Remaining Estimate: 21.5h
>
> When writing to a non-seekable .NET Stream (like a network/socket stream), ArrowStreamWriter will throw an exception:
>  
> {code:java}
> Exception thrown: 'System.NotSupportedException' in System.Net.Sockets.dll
> This stream does not support seek operations.
> {code}
> The reason this throws is because we are using `BastStream.Position` in the writer to calculate the length of bytes that we've written to the stream. We don't need to use the Position in order to calculate the lengths. We should be able to write an Arrow RecordBatch to a NetworkStream directly. Today, we need to write to a MemoryStream, and then copy the MemoryStream to the NetworkStream.
>  



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