Consider we have one RabbitMQ stream in Orleans and there are some messages in the queue that are being processed. If for some reason we stop the application (messages remain in the queue) and then start the application, all the messages are retrieved when the Silo starts, and since at that moment there are no subscribers for the stream, all of them are discarded. How to prevent Orleans from getting messages from queue before consumers are subscribed? How to process remaining messages from queue after restarting of Silo?
Configuration code of Silo:
var siloHostBuilder = new SiloHostBuilder()
.UseLocalhostClustering()
.Configure<ClusterOptions>(options =>
{
options.ClusterId = "dev";
options.ServiceId = "test";
})
.Configure<EndpointOptions>(options =>
{
options.SiloListeningEndpoint = new IPEndPoint(IPAddress.Loopback, siloPort);
options.GatewayListeningEndpoint = new IPEndPoint(IPAddress.Loopback, gatewayPort);
options.AdvertisedIPAddress = IPAddress.Loopback;
options.SiloPort = siloPort;
options.GatewayPort = gatewayPort;
})
.AddMemoryGrainStorage("PubSubStore")
.AddMemoryGrainStorage("Default");
siloHostBuilder = siloHostBuilder.AddRabbitMqStream(providerName, configurator =>
{
configurator.ConfigureRabbitMq(ob =>
{
ob.Configure(options =>
{
options.Connection.HostName = "localhost";
options.Connection.Port = 5672;
options.Connection.VirtualHost = "/";
options.Connection.UserName = "guest";
options.Connection.Password = "guest";
options.QueueNamePrefix = queueNamePrefix;
options.UseQueuePartitioning = true;
options.NumberOfQueues = 1;
});
});
});
_siloHost = siloHostBuilder.Build();
await _siloHost.StartAsync();
After few seconds after this code finishes the queue is cleared.