问题
I am working with Nhibernate and TransactionScope in a large application. The application is supposed to modify 3 databases and support a distribuited transaction across them. This is the code that I call each time I want to query or execute some sql on the database within the distribuited transaction:
IDbConnection connection = new SqlConnection(connectionString);
connection.Open();
ISession session = SessionFactory.OpenSession(connection);
And this is the code called whenever after the necessary operations are executed
IDbConnection sqlConnection = session.Connection;
if (sqlConnection != null && sqlConnection.State == ConnectionState.Open)
sqlConnection.Close();
session.Dispose();
When I execute update-insert-delete statements I also wrap the code inside this:
using (var transaction = session.BeginTransaction())
{ //code here
transaction.Commit();}
I think this is pretty standard stuff. Now ... I do these operations inside this using block:
using (TransactionScope scope = new TransactionScope())
{
//code here
scope.Complete();
}
My problem is that my transaction is being aborted sporadically about 6 seconds after it is being started(Transaction.Current.TransactionInformation.Status becomes Aborted).
This is the trace from my Distribuited Transaction Coordinator:
pid=6296 ;tid=13300 ;time=04/17/2012-19:34:29.430 ;seq=1 ;eventid=TRANSACTION_MANAGER_STARTED_2 ;;"TM Identifier='(null) '" ;"MS DTC started with the following settings: Security Configuration (OFF = 0 and ON = 1): Network Administration of Transactions = 0, Network Clients = 1, Inbound Transactions = 1, Outbound Transactions = 1, Transaction Internet Protocol (TIP) = 0, XA Transactions = 0, MSDTC RPC Security = Mutual Authentication Required, Account = NT AUTHORITY\NetworkService, Firewall Exclusion = 0, Transaction Bridge Installed = 0, Filtering duplicate events = 1."
pid=6296 ;tid=13300 ;time=04/17/2012-19:34:29.430 ;seq=2 ;eventid=TRACE_SETTINGS ;;"TM Identifier='(null) '" ;"Trace Configuration (OFF = 0 and ON = 1): Tracing Of DTC = 1, Tracing Of Transactions = 1, Tracing Of Aborted Transactions = 1, Tracing Of Long-Lived Transactions = 1, Tracing Of All Transactions = 0, Max Limit on Memory Buffers = 0."
pid=6296 ;tid=11372 ;time=04/17/2012-19:35:19.496 ;seq=3 ;eventid=CHECKPOINTING_STOPPED ;;"TM Identifier='(null) '" ;"MSDTC is suspending the checkpointing of transactions due to lack of activity"
pid=6296 ;tid=11372 ;time=04/17/2012-19:35:19.496 ;seq=4 ;eventid=TRACING_STOPPED ;;"TM Identifier='(null) '" ;"MSDTC is suspending the tracing of long - lived transactions due to lack of activity"
pid=6296 ;tid=10520 ;time=04/17/2012-19:36:31.191 ;seq=5 ;eventid=TRACING_STARTED ;;"TM Identifier='(null) '" ;"MSDTC is resuming the tracing of long - lived transactions"
pid=6296 ;tid=10520 ;time=04/17/2012-19:36:31.212 ;seq=6 ;eventid=TRANSACTION_BEGUN ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"transaction has begun, description :'user_transaction'"
pid=6296 ;tid=10520 ;time=04/17/2012-19:36:31.212 ;seq=7 ;eventid=RM_ENLISTED_IN_TRANSACTION ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"resource manager #1001 enlisted as transaction enlistment #1. RM guid = 'b9290b2d-9e1d-43ed-a5f3-e417f9b17906'"
pid=6296 ;tid=8016 ;time=04/17/2012-19:36:36.141 ;seq=8 ;eventid=RECEIVED_ABORT_REQUEST_FROM_BEGINNER ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"received request to abort the transaction from beginner"
pid=6296 ;tid=8016 ;time=04/17/2012-19:36:36.141 ;seq=9 ;eventid=TRANSACTION_ABORTING ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"transaction is aborting"
pid=6296 ;tid=8016 ;time=04/17/2012-19:36:36.141 ;seq=10 ;eventid=RM_ISSUED_ABORT ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"abort request issued to resource manager #1001 for transaction enlistment #1"
pid=6296 ;tid=8016 ;time=04/17/2012-19:36:36.219 ;seq=11 ;eventid=RM_ACKNOWLEDGED_ABORT ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"received acknowledgement of abort request from the resource manager #1001 for transaction enlistment #1"
pid=6296 ;tid=8016 ;time=04/17/2012-19:36:36.219 ;seq=12 ;eventid=TRANSACTION_ABORTED ;tx_guid=5c61419a-eec2-49c1-aaa1-007645a72e32 ;"TM Identifier='(null) '" ;"transaction has been aborted"
Does anyone know what I am doing wrong and how I can keep my transaction from being aborted? Thank you in advance.
Update 1: If I open 2 sessions twoards 2 of the databases immediately after instantiating the transactionscope object then I get the error above. If I just open sessions towards one database and I open a session twoards one of the others later on I get the following error:
The PROMOTE TRANSACTION request failed because there is no local transaction active.
This happens when connection.Open() is reached and a connection is opening towards the second database.
回答1:
No idea if this will help across multiple databases I have not tested this code in that scenario. Here is an example of how I handle transactions.
public interface ISessionManager : IDisposable
{
ISession Session { get; set; }
ISession GetSession();
}
public class SessionManager : ISessionManager
{
private readonly ISessionFactory _sessionFactory;
private TransactionScope _scope;
public SessionManager(ISessionFactory sessionFactory)
{
_sessionFactory = sessionFactory;
}
#region ISessionManager Members
public ISession Session { get; set; }
public ISession GetSession()
{
if (Session == null)
{
Session = _sessionFactory.OpenSession();
if (!CurrentSessionContext.HasBind(_sessionFactory))
{
_scope = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions {IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted});
Session.BeginTransaction(IsolationLevel.ReadCommitted);
CurrentSessionContext.Bind(Session);
}
}
Session = _sessionFactory.GetCurrentSession();
Session.FlushMode = FlushMode.Never;
return Session;
}
public void Dispose()
{
if (CurrentSessionContext.HasBind(_sessionFactory))
{
CurrentSessionContext.Unbind(_sessionFactory);
}
try
{
Session.Transaction.Commit();
_scope.Complete();
_scope.Dispose();
Session.Flush();
}
catch (Exception)
{
Session.Transaction.Rollback();
throw;
}
finally
{
Session.Close();
Session.Dispose();
}
}
#endregion
}
来源：https://stackoverflow.com/questions/10195925/nhibernate-and-transactionscope-transaction-aborted-spontaniously