Saga exceptions

[Sadprofessor]

Hey,

Should I be worried by excessive occurrences of the below in my logs:

08:22:06 - Error - An exception was thrown preparing the message consumers System.InvalidOperationException: Sequence contains no elements
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source)
   at MassTransit.Util.IndexedSagaProperty`2.get_Item(Object key) in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Util\IndexedSagaProperty.cs:line 102
   at MassTransit.Util.IndexedSagaDictionary`1.get_Item(Guid sagaId) in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Util\IndexedSagaDictionary.cs:line 45
   at MassTransit.Saga.InMemorySagaRepository`1.<GetSaga>d__a`1.MoveNext() in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Saga\InMemorySagaRepository.cs:line 44
   at Automatonymous.AutomatonymousStateMachineSagaRepository`1.<GetSaga>d__a`1.MoveNext()
   at MassTransit.Saga.Pipeline.SagaMessageSinkBase`2.<Enumerate>d__0.MoveNext() in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Saga\Pipeline\SagaMessageSinkBase.cs:line 43
   at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
   at MassTransit.Context.ServiceBusReceiveContext.<ReceiveFromEndpoint>b__0(IReceiveContext context) in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Context\ServiceBusReceiveContext.cs:line 102
   at MassTransit.Transports.Endpoint.<>c__DisplayClassd.<Receive>b__5(IReceiveContext acceptContext) in z:\Builds\work\4ed32a1c3fc3f594\src\MassTransit\Transports\Endpoint.cs:line 282    at

We create lots of short lived sagas and I imagine this error is happening because a message is coming back after the saga has been cleaned up (maybe, that's a guess). Should I be worried? This is MT2 btw

Cheers,

Tom

[Sadprofessor]

Bump :-)

[Chris Patterson]

Are you correlating on something other than the CorrelationId? I think so, based on the error, and it's not finding it.

You are using InMemory in production or just in unit tests?

Bump :-)

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[Sadprofessor]

Hey,

No it's a CorrelationId correlation. So it seems to happen when a saga is cancelled mid way through (on purpose, this is quite common to avoid doing unnecessary work in our domain) and a message already in flight comes back once the saga has been finalized. 

Looks like the IndexedSagaProperty leaves empty hashsets hanging around for a key. I've changed it to remove the hashset entirely when removing the last item and that seemed to fix it.

Are you still planning on releasing new versions of MT2, is it worth me pushing this?

Cheers,

Tom

Bump :-)

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[Chris Patterson]

Oh yes. MassTransit v2 will still be patched for fixes and such. And pull requests will be reviewed and pulled as well. 

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Chris Patterson

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