The cost of not knowing MongoDB

How to recreate the experiment

1. EC2 Instances
   • In the cloud folder there are bash scripts to launch and configure the necessary EC2 instances.
   • The scripts with ...app... are related to the instance that will execute the application code and store its execution metrics.
   • The scripts with ...mdb... are related to the instance that will execute the MongoDB server, which we'll use to store the application data and execute the load tests.
   • The files ending with ...launch.sh should be executed first to create the instances on AWS.
   • The files ending with ...dns.sh should be executed second to configure the public and private DNS.
   • The files ending with ...config.sh should be executed last and when already logged to the instance through SSH to apply MongoDB recommended production notes.
   • Obs: You need to change some script variables to use it on your AWS account and region.
2. MongoDB
   • MongoDB has to be installed in both instances, ...app... and ...mdb....
   • In the instance ...mdb... MongoDB will be used to store the application's data.
   • In the instance ...app... MongoDB will be used to store the application's execution metrics.
3. Application configuration
   • The reference values used to configure the data generation and distribution of the application can be found in ./src/references.ts. The current values in it were used during the article tests.
   • The MongoDB connection string and configuration used in the application execution and tests can be found in ./src/config.ts
4. Initial Scenario
   • To execute the initial scenario code you need to have Node.JS installed and have executed npm i on the project folder to install dependencies.
   • Most of the code related to the initial scenario is in the ./src/scenario folder.
   • In the file ./src/scenario/index.ts you can change which application version you want to load the initial scenario.
   • To run the load of the initial scenario, use the command npm run scenario.
5. Load Test
   • To execute the load test code you need to have Node.JS installed and have executed npm i on the project folder to install dependencies.
   • Most of the code related to the initial scenario is in ./src/load-test folder.
   • In the file ./src/load-test/index.ts you can change to which application version you want to load test.
   • To run the load of the initial scenario, use the command npm run scenario.