[jira] [Created] (ARROW-15908) FlightClient.DoAction raises RPC exception (C# Client <-> Python Server Flight)

["Chris Dunderdale (Jira)" <ji...@apache.org>]

Chris Dunderdale created ARROW-15908:
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             Summary: FlightClient.DoAction raises RPC exception (C# Client <-> Python Server Flight)
                 Key: ARROW-15908
                 URL: https://issues.apache.org/jira/browse/ARROW-15908
             Project: Apache Arrow
          Issue Type: Bug
          Components: C#, Python
    Affects Versions: 7.0.0
         Environment: Rider 2021.3
Windows
Installed Nuget Packages:
Grpc.Net.Client 2.42.0
Apache.Arrow.Flight
            Reporter: Chris Dunderdale


Hi all

I'm busy testing arrow flight and I'm noticing that requesting actions from C# to Python is raising the following exception.
{code:java}
Unhandled exception. System.AggregateException: One or more errors occurred. (Status(StatusCode="Unknown", Detail="a bytes-like object is required, not 'str'. Detail: Python exception: TypeError"))
 ---> Grpc.Core.RpcException: Status(StatusCode="Unknown", Detail="a bytes-like object is required, not 'str'. Detail: Python exception: TypeError")
   at Grpc.Net.Client.Internal.HttpContentClientStreamReader`2.MoveNextCore(CancellationToken cancellationToken)
   at Apache.Arrow.Flight.Internal.StreamReader`2.MoveNext(CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Test.Program.Main(String[] args) in C:\Users\Chris\Test\Program.cs:line 33
 {code}
I've built [C# client|https://github.com/apache/arrow/tree/master/csharp/examples/FlightClientExample] and [Python server|https://github.com/apache/arrow/tree/master/python/examples/flight] which I've obtained from the Arrow Github repo.

 

I've trimmed down the C# client to just the following code:

 
{code:java}
using System;
using Grpc.Net.Client;
using Apache.Arrow.Flight.Client;
using Apache.Arrow.Flight;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            var address = "http://localhost:5005";
            Console.WriteLine($"Connecting to: {address}");
            var channel = GrpcChannel.ForAddress(address);
            var client = new FlightClient(channel);
            var shutdownAction = client.DoAction(new FlightAction("shutdown"));                 shutdownAction.ResponseStream.MoveNext(default).Wait();
            
        }
    }
} {code}
 

I've noted that the original code on the github repo example uses await (which no longer seems to work) and if I leave the final line out, the do_action() method is never called server-side.



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