How to configure multiple retry policies in MassTransit - rabbitmq

Question

I want two separate retry policies for a specific consumer. One for HttpRequestException and SocketException, and the other for a custom DatabaseException and unhandled SqlException. I want to do that because I want to have separate exponential retry intervals for both.
I have the following configuration:
cfg.ReceiveEndpoint(
host,
"ExampleQueueName",
ec =>
{
ec.Consumer<ExampleConsumer>(context);
ec.EnablePriority(5);
ec.UseRetry(retryConfig =>
{
// exponential backup in minutes
retryConfig.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
retryConfig.Handle<HttpRequestException>(x => x.IsTransient());
retryConfig.Handle<SocketException>(x => x.IsTransient());
});
ec.UseRetry(retryConfig =>
{
// exponential backup in seconds
retryConfig.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
retryConfig.Handle<DatabaseException>(x => x.IsTransient());
retryConfig.Handle<SqlException>(x => x.IsTransient());
});
});
Presently, only the second one is used. The first one appears to be overwritten.
I've also tried configuring second level retries like so:
cfg.ReceiveEndpoint(
host,
"QueueName",
ec =>
{
ec.Consumer<ExampleConsumer>(context, factory =>
{
factory.UseRetry(retryConfig =>
{
// exponential backup in seconds for sql and concurrency exceptions
retryConfig.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
retryConfig.Handle<DatabaseException>(x => x.IsTransient());
retryConfig.Handle<SqlException>(x => x.IsTransient());
});
});
ec.EnablePriority(5);
ec.UseRetry(retryConfig =>
{
// exponential backup in minutes for http request exceptions
retryConfig.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
retryConfig.Handle<DatabaseException>(x => x.IsTransient());
retryConfig.Handle<SqlException>(x => x.IsTransient());
});
});
But that doesn't seem to work either. Does any know how I can apply different retry intervals for different exception types?

Answer 1

MassTransit builds everything as a pipeline, and the order of the filters matters. Rewriting your example above should fix the issue (all I did was move the Consumer to the end).
cfg.ReceiveEndpoint("ExampleQueueName", ec =>
{
ec.EnablePriority(5);
ec.UseMessageRetry(r =>
{
r.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
r.Handle<HttpRequestException>(x => x.IsTransient());
r.Handle<SocketException>(x => x.IsTransient());
});
ec.UseMessageRetry(r =>
{
r.Intervals(new[] { 1, 2, 4, 8, 16, 32 }.Select(t => TimeSpan.FromSeconds(t)).ToArray());
r.Handle<DatabaseException>(x => x.IsTransient());
r.Handle<SqlException>(x => x.IsTransient());
});
ec.Consumer<ExampleConsumer>(context);
});