如何在 MassTransit 中配置多次重试策略

Question

我想要针对特定消费者的两个单独的重试策略。一个用于 HttpRequestException 和 SocketException，另一个用于自定义 DatabaseException 和未处理的 SqlException。我想这样做是因为我想为两者设置单独的指数重试间隔。

我有以下配置：

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());
        });
    });

目前只有第二种。第一个似乎被覆盖了。

我也试过像这样配置二级重试：

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());
        });
    });

但这似乎也不起作用。有人知道如何为不同的异常类型应用不同的重试间隔吗？

Answer 1

MassTransit 将一切构建为管道，过滤器的顺序很重要。重写上面的示例应该可以解决问题（我所做的只是将消费者移到最后）。

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);
});

如何在 MassTransit 中配置多次重试策略

How to configure multiple retry policies in MassTransit

masstransit

rabbitmq