Question

A team uses CodePipeline with a CodeBuild project to build a large Java monolith. The full Maven build takes 22 minutes, most of which is spent downloading dependencies from Maven Central on every run because the build container starts fresh each time. The team wants to reduce build time without changing their source control workflow or introducing a separate artifact repository. What is the MOST effective change to make in the CodeBuild configuration?

Accepted Answer

Enable local caching with the LOCAL_CUSTOM_CACHE mode and specify the Maven .m2 directory paths in the cache section of the buildspec.

Answer

Increase the CodeBuild compute type to the largest available instance so dependency downloads complete faster in parallel.

Answer

Configure S3 source caching on the pipeline source stage so dependencies are cached between pipeline executions.

Answer

Set the buildspec 'artifacts' section to include the .m2 directory so downloaded dependencies persist to the pipeline artifact bucket.