5/1/2023 0 Comments Masstransit saga queue errorRedelivery 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. 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. Message-based communication is a reliable and scalable way to implement a service oriented architecture. Retry after a steadily increasing delay, up to the retry limitĮach policy has configuration settings which specifies the expected behavior. MassTransit provides an extensive set of features on top existing message transports, resulting in a developer friendly way to asynchronously connect services using message-based conversation patterns. 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 Does the MassTransit DeadLetter pipe configuration have any effect on whether messages that exhaust their servicebus max-deliveries end up in servicebus dead-letter queue.Learn how to configure message retry in this short video (opens new window). MT defines dead-letter as no consumer registered for the message type on the receive endpoint, and the message gets moved into the _skipped queue - Dead Letter. If not, how do I configure the error pipe to get this behavior. Will message faults use the default service bus redelivery mechanism? Or is it enough to just use the DiscardFaultedMessage extension to prevent _error queue and rely on servicebus redelivery. X.UseFilter(new RethrowErrorTransportFilter()) If I configure my consumers error pipe like this configurator.ConfigureError(x => Instead, we want our consumers to rely on AZ servicebus default redelivery mechanism PeekLock where faulted messages are redelivered N times and if all N deliveries fault then message is moved into the servicebus queue's dead-letter. MassTransit's default error pipe configuration sends faults to the _error queue as explained in the docs - Error Pipe.
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