"Unable to enlist in transaction, a local transaction already exists" in
multithreaded environments
---------------------------------------------------------------------------------------------------
Key: DNET-833
URL: http://tracker.firebirdsql.org/browse/DNET-833
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 6.0.0.0
Reporter: Daniel H
Assignee: Jiri Cincura
We are developing an ASP.NET Core (.NET Core Version 2.1.1) web application.
We are using a Firebird 3 Connection Pool with the following options in the
connection string:
- Pooling: True
- MinPoolSize: 0
- MaxPoolSize: 50
- Auto_Commit: false
- Enlist: true
On serveral occasions we receive the following exception:
"Unable to enlist in transaction, a local transaction already exists".
This happens in our minimal breaking exampple, if we call the following code
with a few threads over HTTP GET:
[HttpGet]
public async Task<IActionResult> GetX()
{
IEnumerable<string> x= null;
using (var ts = new TransactionScope(
TransactionScopeAsyncFlowOption.Enabled))
{
using (var connection = new FbConnection(connectionString))
{
roles = await connection.QueryAsync<string>(
sql: "SELECT strField FROM X",
commandType: CommandType.Text);
}
ts.Complete();
}
return Ok(x);
}
If we encapsulate the TransactionScope block with a Semaphore it runs fine.
Therefore the question: Does this library supporting multithreading or do we
need to protect Firebird calls with a semaphore?
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