adamreeve opened a new issue, #44360:
URL: https://github.com/apache/arrow/issues/44360
### Describe the bug, including details regarding any error messages,
version, and platform.
A .NET Flight Server with a `DoExchange` method is incompatible with a
PyArrow Flight client. The C# implementation expects the first message received
from the data stream to contain both the descriptor and the schema, but the
client first sends the descriptor with an empty `data_header`, followed by
another message with the schema.
This results in an error like this in the C# server:
```
fail: Grpc.AspNetCore.Server.ServerCallHandler[6]
Error when executing service method 'DoExchange'.
System.ArgumentOutOfRangeException: Specified argument was out of the
range of valid values. (Parameter 'length')
at Google.FlatBuffers.ByteBuffer.GetUint(Int32 offset)
at Google.FlatBuffers.ByteBuffer.GetInt(Int32 offset)
at Apache.Arrow.Flatbuf.Message.GetRootAsMessage(ByteBuffer _bb,
Message obj)
at Apache.Arrow.Flatbuf.Message.GetRootAsMessage(ByteBuffer _bb)
at
Apache.Arrow.Flight.Internal.RecordBatchReaderImplementation.ReadSchemaAsync(CancellationToken
cancellationToken)
at
Apache.Arrow.Flight.Internal.RecordBatchReaderImplementation.ReadFlightDescriptor()
at
ExchangeServer.Server.DoExchange(FlightServerRecordBatchStreamReader
requestStream, FlightServerRecordBatchStreamWriter responseStream,
ServerCallContext context) in
/home/adam/dev/flight-exchange/DotnetExample/ExchangeServer/Server.cs:line 15
at
Grpc.Shared.Server.DuplexStreamingServerMethodInvoker`3.Invoke(HttpContext
httpContext, ServerCallContext serverCallContext, IAsyncStreamReader`1
requestStream, IServerStreamWriter`1 responseStream)
at
Grpc.Shared.Server.DuplexStreamingServerMethodInvoker`3.Invoke(HttpContext
httpContext, ServerCallContext serverCallContext, IAsyncStreamReader`1
requestStream, IServerStreamWriter`1 responseStream)
at
Grpc.AspNetCore.Server.Internal.CallHandlers.DuplexStreamingServerCallHandler`3.HandleCallAsyncCore(HttpContext
httpContext, HttpContextServerCallContext serverCallContext)
at
Grpc.AspNetCore.Server.Internal.CallHandlers.ServerCallHandlerBase`3.<HandleCallAsync>g__AwaitHandleCall|8_0(HttpContextServerCallContext
serverCallContext, Method`2 method, Task handleCall)
```
### Component(s)
C#
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