Question

A team stores multiple microservices in a single monorepo on AWS CodeCommit. They use CodePipeline with a CodeStar Connections source stage that triggers on pushes to the main branch. Every push to main starts all six pipelines, even when a commit only changes files for one service, wasting build minutes and delaying deployments. The team wants each pipeline to start only when files under that service's directory change, without splitting the repository. What is the MOST effective way to achieve this?

Accepted Answer

Configure the pipeline's source trigger with a Git configuration that includes push filters specifying the branch and file paths (glob patterns) for that service's directory.

Answer

Add a CodeBuild stage at the start of each pipeline that inspects the changed files and calls StopPipelineExecution if the service directory was not modified.

Answer

Create an EventBridge rule on CodeCommit referenceUpdated events with an event pattern that matches specific file paths in the commit.

Answer

Enable full clone on the source action and use a Lambda function in the source stage to diff commits and conditionally approve the pipeline.