Messages from the queue will be load balanced across all instances (the competing consumer pattern). Use the same queue name for each instance. When running multiple instances of the same service. If a received message is not handled by a consumer, the skipped message will be moved to a skipped queue, which is named with a _skipped suffix. A queue may contain more than one message type, the message type is used to deliver the message to the appropriate consumer configured on the receive endpoint. Each receive endpoint maps to one queue. Consumers and sagas should have their own receive endpoint, with a unique queue name. A service's receive endpoints do not affect other services or their receive endpoints, as long as they do not share the same queue. Published messages are routed to a receive endpoint queue by message type, using exchanges and exchange bindings. Redelivery is a form of retry (some refer to it as second-level retry) where the message is removed from the queue and then redelivered to the queue at a future time.The following recommendations should be considered best practices for building applications using MassTransit, specifically with RabbitMQ. In these situations, it's best to dust off and nuke the site from orbit - at a much later time obviously. Some errors take a while to resolve, say a remote service is down or a SQL server has crashed. If a DataException is thrown matching the filter expression, it wouldn't be handled by the second retry filter, but would be handled by the first retry filter. In the above example, if the consumer throws an ArgumentNullException it won't be retried (because it would obvious fail again, most likely). 
You can use multiple calls to these methods to specify filters for multiple exception types: No further filtering is possible if this version is used. Non-generic version that needs one or more exception types as parameters. You can also specify a function argument that will filter exceptions further based on other parameters. With no argument, all exceptions of specified type will be either handled or ignored. Generic version Handle and Ignore where T must be derivate of System.Exception. A filter can have either Handle or Ignore statements, combining them has unpredictable effects.
Specify exception types using either the Handle or Ignore method. To implement this, you can use an exception filter. Sometimes you do not want to always retry, but instead only retry when some specific exception is thrown and fault for all other exceptions.
Retry after a steadily increasing delay, up to the retry limitĮach policy has configuration settings which specifies the expected behavior. Retry after an exponentially increasing delay, up to the retry limit Retry after a delay, for each interval specified Retry after a fixed delay, up to the retry limit When configuring message retry, there are several retry policies available, including: Policy
#Masstransit saga queue error how to
Learn how to configure message retry in this short video (opens new window).
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