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https://issues.apache.org/jira/browse/ARROW-5019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662041#comment-17662041
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Rok Mihevc commented on ARROW-5019:
-----------------------------------
This issue has been migrated to [issue
#21517|https://github.com/apache/arrow/issues/21517] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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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