Switch the Marketing Api event store to in-memory storage because CAP requires MongoDB version to be larger than 4.0 and enable clustering to use the local storage transaction provided by MongoDB

src/Services/Marketing/Marketing.API/Marketing.API.csproj

@@ -30,7 +30,7 @@
     <PackageReference Include="DotNetCore.CAP" Version="2.5.0-preview-69219007" />
     <PackageReference Include="DotNetCore.CAP.AzureServiceBus" Version="2.5.0-preview-69219007" />
     <PackageReference Include="DotNetCore.CAP.RabbitMQ" Version="2.5.0-preview-69219007" />
-    <PackageReference Include="DotNetCore.CAP.MongoDB" Version="2.5.0-preview-69219007" />
+    <PackageReference Include="DotNetCore.CAP.InMemoryStorage" Version="2.5.0-preview-69219007" />
     <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.2.1" />
     <PackageReference Include="Microsoft.ApplicationInsights.DependencyCollector" Version="2.6.1" />
     <PackageReference Include="Microsoft.ApplicationInsights.Kubernetes" Version="1.0.2" />

src/Services/Marketing/Marketing.API/Startup.cs

@@ -79,12 +79,7 @@
  
             services.AddCap(options =>
             {
-                // using MongoDB as the event storage
-                options.UseMongoDB(configure =>
-                {
-                    configure.DatabaseConnection = Configuration["MongoConnectionString"];
-                    configure.DatabaseName = Configuration["MongoDatabase"];
-                });
+                options.UseInMemoryStorage();
 
                 if (Configuration.GetValue<bool>("AzureServiceBusEnabled"))
                 {