Remo Gloor created AMQNET-412:
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Summary: Messages are enlisted to the wrong transaction
Key: AMQNET-412
URL: https://issues.apache.org/jira/browse/AMQNET-412
Project: ActiveMQ .Net
Issue Type: Bug
Environment: Apache.NMS.ActiveMq 1.5.7
Reporter: Remo Gloor
Assignee: Jim Gomes
Priority: Critical
Under load active mq enlists a message to a previous transactions. This leads
to very strange behaviors:
- Database is updated and message is rolled back
- Message is completed but database rolledback
All this results in an invalid system state making. DTC is not usable this way.
Analysis of the source code have shown that the problem is in
NetTxSession.DoStartTransaction There it checks if a .NET Transaction in the
TransactionContext. In this case it adds the message to that transaction. But
this can be the previous transaction because DTC 2-PhaseCommit is asyncronous.
It needs to check if the Current Transaction is the same as one before and wait
if they do not match.
The following applacation demonstrates the problem when enough messages are
processed E.g. enqueue 100 msg in foo.bar. It is basically TestRedeliveredCase3
but with half of the messages failing.
Whenever a SinglePhaseCommit occurs in the TestSinglePhaseCommit this means the
database would be commited in an own transaction.
class Program
{
private static INetTxSession activeMqSession;
private static IMessageConsumer consumer;
private static INetTxConnection connection;
static void Main(string[] args)
{
using (connection = CreateActiveMqConnection())
using (activeMqSession = connection.CreateNetTxSession())
using (consumer =
activeMqSession.CreateConsumer(SessionUtil.GetQueue(activeMqSession,
"queue://foo.bar")))
{
connection.Start();
while (true)
{
try
{
using (TransactionScope scoped = new
TransactionScope(TransactionScopeOption.RequiresNew))
{
IMessage msg = null;
while (msg == null)
{
msg = consumer.ReceiveNoWait();
}
OnMessage(msg);
scoped.Complete();
}
}
catch(Exception exception) {}
}
}
}
private static INetTxConnection CreateActiveMqConnection()
{
var connectionFactory = new
Apache.NMS.ActiveMQ.NetTxConnectionFactory("activemq:tcp://localhost:61616")
{
AcknowledgementMode = AcknowledgementMode.Transactional
};
return connectionFactory.CreateNetTxConnection();
}
private static void OnMessage(IMessage message)
{
var x = new TestSinglePhaseCommit();
var session2 = activeMqSession;
{
Transaction.Current.EnlistDurable(Guid.NewGuid(), x,
EnlistmentOptions.None);
// The proble occurs only if a message is sent using the same
session like the receiver
using (var producer =
session2.CreateProducer(SessionUtil.GetQueue(session2, "queue://foo.baz")))
{
producer.Send(new ActiveMQTextMessage("foo"));
}
if (new Random().Next(2) == 0) throw new Exception();
}
}
}
internal class TestSinglePhaseCommit : ISinglePhaseNotification
{
public void Prepare(PreparingEnlistment preparingEnlistment)
{
Console.WriteLine("Tx Prepare");
preparingEnlistment.Prepared();
}
public void Commit(Enlistment enlistment)
{
Console.WriteLine("Tx Commit");
enlistment.Done();
}
public void Rollback(Enlistment enlistment)
{
Console.WriteLine("Tx Rollback");
enlistment.Done();
}
public void InDoubt(Enlistment enlistment)
{
Console.WriteLine("Tx InDoubt");
enlistment.Done();
}
public void SinglePhaseCommit(SinglePhaseEnlistment
singlePhaseEnlistment)
{
Console.WriteLine("Tx SinglePhaseCommit");
singlePhaseEnlistment.Committed();
}
}
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