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From "Imran (JIRA)" <jira+amq...@apache.org>
Subject [jira] [Commented] (AMQNET-471) Synchronous message consumer will lose a message that failed to commit whilst the broker was unavailable
Date Mon, 10 Mar 2014 11:25:45 GMT

    [ https://issues.apache.org/jira/browse/AMQNET-471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13925669#comment-13925669
] 

Imran commented on AMQNET-471:
------------------------------

I rewrote the test in java using an active mq 5.9 client. It looks like there is a difference
in behavior. The java version blocks on commit if the broker is down. If you then start the
broker manually an exception is thrown but the rollback code executes, the message is redelivered
and the test passes.

> Synchronous message consumer will lose a message that failed to commit whilst the broker
was unavailable
> --------------------------------------------------------------------------------------------------------
>
>                 Key: AMQNET-471
>                 URL: https://issues.apache.org/jira/browse/AMQNET-471
>             Project: ActiveMQ .Net
>          Issue Type: Bug
>          Components: ActiveMQ
>    Affects Versions: 1.6.2
>            Reporter: Imran
>            Assignee: Jim Gomes
>         Attachments: TransactionContext.cs.patch
>
>
> If the broker is down then the client can not commit the current message. An exception
is thrown by the library. This is the behavior you would expect.
> If you then try and rollback the transaction on the session due to the exception and
resume message consumption, the rolled back message will never be redelivered.
> {code:title=Failing Test|borderStyle=solid} 
>  [TestFixture, Explicit]
>     public class BrokerRestart
>     {
>         [Test]
>         public void Message_should_be_redilivered_if_broker_is_down_and_try_commit()
>         {
>             StartService(ActiveMqMaster);
>             DeleteQueue();
>             SendMessageToQueue();
>             var session = _connection.CreateSession(AcknowledgementMode.Transactional);
>             var consumer = session.CreateConsumer(SessionUtil.GetDestination(session,
InQ));
>             var message = consumer.Receive(TimeSpan.FromSeconds(30));
>             _log.Debug("Received message");
>             StopService(ActiveMqMaster);
>             _log.Debug("Commiting transaction");
>             try
>             {
>                 session.Commit();
>             }
>             catch (Exception ex)
>             {
>                 _log.ErrorFormat("Exception: {0}", ex.ToString().Substring(0, 250));
>                 try
>                 {
>                     session.Rollback();
>                 }
>                 catch (Exception einner)
>                 {
>                     _log.Debug("Rollback transaction");
>                     _log.ErrorFormat("Exception: {0}", einner.ToString().Substring(0,
250));
>                 }
>             }
>             StartService(ActiveMqMaster);
>             message = consumer.Receive(TimeSpan.FromSeconds(30));
>             Assert.That(message, Is.Not.Null, "message was not redilivered");
>         }
>         private void StartService(ServiceController service)
>         {
>             if (service.Status != ServiceControllerStatus.Running)
>                 service.Start();
>             service.WaitForStatus(ServiceControllerStatus.Running);
>             _log.Debug("Started Broker");
>         }
>         private void StopService(ServiceController service)
>         {
>             if (service.Status != ServiceControllerStatus.Stopped)
>                 service.Stop();
>             service.WaitForStatus(ServiceControllerStatus.Stopped);
>             _log.Debug("Stopped Broker Broker");
>         }
>         private void SendMessageToQueue()
>         {
>             using (var session = _connection.CreateSession())
>             using (var producer = session.CreateProducer(SessionUtil.GetDestination(session,
InQ)))
>             {
>                 producer.Send(producer.CreateTextMessage(1.ToString()));
>                 session.Commit();
>             }
>             _log.Debug("Primed Input Queue");
>         }
>         private void DeleteQueue()
>         {
>             using (var session = _connection.CreateSession())
>             {
>                 SessionUtil.DeleteDestination(session, InQ);
>             }
>         }
>         [SetUp]
>         public void TestSetup()
>         {
>             LogManager.Adapter = new ConsoleOutLoggerFactoryAdapter(LogLevel.Debug, true,
true, true, "HH:MM:ss");
>             _log = LogManager.GetLogger(typeof (BrokerRestart).Name);
>             var factory = new ConnectionFactory(@"failover:(tcp://localhost:61616)")
>             {
>                 AcknowledgementMode = AcknowledgementMode.Transactional,
>                 RedeliveryPolicy = new RedeliveryPolicy { InitialRedeliveryDelay = 0,
MaximumRedeliveries = 3, BackOffMultiplier = 0, UseExponentialBackOff = false },
>                 AsyncSend = false,
>                 PrefetchPolicy = new PrefetchPolicy {All = 5}
>             };
>             _connection = factory.CreateConnection();
>             _connection.Start();
>             //Tracer.Trace = new CommonLoggingTraceAdapter();
>         }
>         protected ServiceController ActiveMqMaster = new ServiceController(@"ActiveMQ");
>         //protected ServiceController ActiveMqSlave = new ServiceController(@"ActiveMQSlave");
>         private IConnection _connection;
>         private const string InQ = "integration-test-q";
>         private ILog _log;
>     }
> {code}
> {code:title=Passing Test With Patch|borderStyle=solid} 
> using System;
> using System.Configuration;
> using System.ServiceProcess;
> using System.Threading;
> using System.Threading.Tasks;
> using Apache.NMS;
> using Apache.NMS.ActiveMQ;
> using Apache.NMS.Policies;
> using Apache.NMS.Util;
> using Common.Logging;
> using Common.Logging.Simple;
> using NUnit.Framework;
> namespace IntegrationTests.ApacheNms.Jira
> {
>     [TestFixture]
>     public class BrokerRestart
>     {
>         //AMQNET-471
>         [Test]
>         public void Message_should_be_redilivered_if_broker_is_down_and_try_to_commit()
>         {
>             var session = _connection.CreateSession(AcknowledgementMode.Transactional);
>             var consumer = session.CreateConsumer(SessionUtil.GetDestination(session,
InQueue));
>             SendMessageToQueue();
>             consumer.Receive(TimeSpan.FromSeconds(5));
>             StopService(ActiveMqMaster);
>             var commiter = TryCommit(session);
>             StartService(ActiveMqMaster);
>             commiter.Wait();
>             var message = consumer.Receive(TimeSpan.FromSeconds(5));
>             TryCommit(session).Wait();
>             Assert.That(message, Is.Not.Null, "message was not redilivered");
>             Assert.That(CountMessagesInQueue(OutQueue), Is.EqualTo(0));
>         }
>         //Commit blocks if the broker is down with the patch for AMQNET-471
>         private Task TryCommit(ISession session)
>         {
>             var task = Task.Factory.StartNew(() =>
>             {
>                 try
>                 {
>                     session.Commit();
>                 }
>                 catch (Exception ex)
>                 {
>                     _log.ErrorFormat("Exception: {0}", ex.ToString().Substring(0, 250));
>                     try
>                     {
>                         session.Rollback();
>                     }
>                     catch (Exception einner)
>                     {
>                         _log.Debug("Rollback transaction");
>                         _log.ErrorFormat("Exception: {0}", einner.ToString().Substring(0,
250));
>                     }
>                 }
>             });
>             //Give it a chance to start.
>             Thread.Sleep(1000);
>             return task;
>         }
>         private int CountMessagesInQueue(string queue)
>         {
>             var count = 0;
>             using (var session = _connection.CreateSession(AcknowledgementMode.Transactional))
>             using (var consumerIn = session.CreateConsumer(SessionUtil.GetDestination(session,
queue)))
>             {
>                 while (true)
>                 {
>                     var msg = consumerIn.Receive(TimeSpan.FromSeconds(2));
>                     if (msg == null)
>                         break;
>                     count++;
>                 }
>             }
>             return count;
>         }
>         private void StartService(ServiceController service)
>         {
>             if (service.Status != ServiceControllerStatus.Running || service.Status ==
ServiceControllerStatus.StartPending)
>                 service.Start();
>             service.WaitForStatus(ServiceControllerStatus.Running);
>             _log.Debug("Started Broker");
>         }
>         private void StopService(ServiceController service)
>         {
>             if (service.Status != ServiceControllerStatus.Stopped)
>                 service.Stop();
>             service.WaitForStatus(ServiceControllerStatus.Stopped);
>             _log.Debug("Stopped Broker");
>         }
>         private void SendMessageToQueue()
>         {
>             using (var session = _connection.CreateSession())
>             using (var producer = session.CreateProducer(SessionUtil.GetDestination(session,
InQueue)))
>             {
>                 producer.Send(producer.CreateTextMessage(1.ToString()));
>                 session.Commit();
>             }
>             _log.Debug("Primed Input Queue");
>         }
>         private void DeleteQueue(string queue)
>         {
>             using (var session = _connection.CreateSession())
>             {
>                 SessionUtil.DeleteDestination(session, queue);
>             }
>         }
>         [SetUp]
>         public void TestSetup()
>         {
>             LogManager.Adapter = new ConsoleOutLoggerFactoryAdapter(LogLevel.Debug, true,
true, true, "HH:MM:ss");
>             _log = LogManager.GetLogger(typeof(BrokerRestart).Name);
>             StartService(ActiveMqMaster);
>             _factory = new ConnectionFactory(ActiveMqConnectionString)
>             {
>                 AcknowledgementMode = AcknowledgementMode.Transactional,
>                 RedeliveryPolicy = new RedeliveryPolicy { InitialRedeliveryDelay = 0,
MaximumRedeliveries = 3, BackOffMultiplier = 0, UseExponentialBackOff = false },
>                 AsyncSend = false,
>                 PrefetchPolicy = new PrefetchPolicy { All = 5 }
>             };
>             _connection = _factory.CreateConnection();
>             _log.Debug("Starting connection");
>             _connection.Start();
>             _log.Debug("Connection established");
>             DeleteQueue(InQueue);
>             DeleteQueue(OutQueue);
>             //Tracer.Trace = new CommonLoggingTraceAdapter();
>         }
>         [TearDown]
>         public void TestTearDown()
>         {
>             _connection.Dispose();
>         }
>         protected ServiceController ActiveMqMaster = new ServiceController(ActiveMasterServiceName,
ActiveMqMachineName);
>         protected ServiceController ActiveMqSlave = new ServiceController(ActiveMqSlaveServiceName,
ActiveMqMachineName);
>         private static readonly string ActiveMqMachineName = ConfigurationManager.AppSettings["ActiveMqServiceMachineName"];
>         private static readonly string ActiveMqConnectionString = ConfigurationManager.ConnectionStrings["ActiveMqServer"].ConnectionString;
>         private static readonly string ActiveMasterServiceName = ConfigurationManager.AppSettings["ActiveMqMasterName"];
>         private static readonly string ActiveMqSlaveServiceName = ConfigurationManager.AppSettings["ActiveMqSlaveName"];
>         private IConnection _connection;
>         private const string InQueue = "integration-test-q-in";
>         private const string OutQueue = "integration-test-q-out";
>         private ILog _log;
>         private ConnectionFactory _factory;
>     }
> }
> {code}



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