Eric Erhardt created ARROW-5908:
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Summary: [C#] ArrowStreamWriter doesn't align buffers to 8 bytes
Key: ARROW-5908
URL: https://issues.apache.org/jira/browse/ARROW-5908
Project: Apache Arrow
Issue Type: Improvement
Components: C#
Reporter: Eric Erhardt
Assignee: Eric Erhardt
When writing RecordBatches using ArrowStreamWriter, if the ArrowBuffers being
written aren't all 8 byte aligned, the serialized RecordBatch won't conform to
the Arrow specification. This leads to other languages' readers to throw an
error when reading Arrow streams written by the C# writer.
For example, if reading the stream from Python or C++, an error is raised here:
[https://github.com/apache/arrow/blob/f77c3427ca801597b572fb197b92b0133269049b/cpp/src/arrow/ipc/reader.cc#L107-L110]
A similar error is raised when Java tries to read the stream.
We should be ensuring that the buffers being written to the stream are padded
to 8 bytes, no matter their length, as specified in
[https://arrow.apache.org/docs/format/Layout.html#requirements-goals-and-non-goals]
{quote} * It is required to have all the contiguous memory buffers in an IPC
payload aligned at 8-byte boundaries. In other words, each buffer must start at
an aligned 8-byte offset. Additionally, each buffer should be padded to a
multiple of 8 bytes.{quote}
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