Demo WorkerRole Azure Cloud Service

WorkerRole to perform latency measurement in Azure Cloud Service for Mongo API Support powered by Azure DocumentDB

• Details:
• Uses C# Mongo SDK
• Uses read preference = NEAREST for read latency measurement
• Write latency is measured only from write region

Getting started

1. Set up Azure Cosmos DB

   • Create an Azure Cosmos DB Account configured to use the MongoDb API.
   • Add 'East US' region as a write region
   • Add 'Australia East','South India','West Europe','East Asia' as read regions. 'East US' will be a read region as well by default
   • Create a database in it named 'nodetest' with single partition collections 'demometrics' and 'demodata'

   (this configuration is important since the front end is configured with this setting as well)

2. Clone / download the repo and open the LoadGenerator.sln file in Visual Studio

3. Configure Cosmos DB server settings in the worker App

   • Open the WorkerRole1/app.config file and modify the following key/value pairs to reflect your MongoDb settings

   <appSettings>
      <add key="MongoUserName" value="YOUR_MONGO_USER_NAME" /> 
      <add key="MongoPassword" value="YOUR_MONGO_PASSWORD" />
      <add key="MongoDefaultEndpoint" value="YOUR_MONGO_HOST" /> <!--example:my-mongo.documents.azure.com-->
      <add key="DocumentDbEndPoint" value="https:// followed by YOUR_MONGO_HOST" /> <!--example:https://my-mongo.documents.azure.com-->
      <add key="MongoPort" value="YOUR_MONGO_PORT" />
   </appSettings>

4. Package the Cloud Service

   • Right click on the LoadGeneator project and choose 'Package'.
   • In 'service configuration', choose 'East US' and click 'Package'
   • LoadGenerator.cspkg (Cloud service package file) and ServiceConfiguration.East US.cscfg (Cloud service configuration file) are created abd placed within the app.publish folder.

5. Create and deploy Azure cloud service

   • Create an azure cloud service deployed at the 'East US' location.
   • Upload the LoadGenerator.cspkg and ServiceConfiguration.East US.cscfg file when prompted. The cloud service will deploy in a few minutes. Ensure that its status is 'Running'
   • Repeat steps 4 and 5 for the other 4 locations.

6. Deploy front end Web app

   • The source code and steps to deploy the frontend web app is here
   • The Front end web app to visualize latencies is deployed here