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mongo/docs/evergreen-testing/configuration.md

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Evergreen configuration

This document describes the continuous integration (CI) configuration for MongoDB.

Projects

There are a number of Evergreen projects supporting MongoDB's CI. For more information on Evergreen-specific terminology used in this document, please refer to the Project Configuration section of the Evergreen wiki.

mongodb-mongo-master

The main project for testing MongoDB's dev environments with a number build variants, each one corresponding to a particular compile or testing environment to support development. Each build variant runs a set of tasks; each task ususally runs one or more tests.

`mongodb-mongo-master-nightly

Tracks the same branch as mongodb-mongo-master, each build variant corresponds to a (version, OS, architecure) triplet for a supported MongoDB nightly release.

sys_perf

The system performance project.

microbenchmarks

Performance unittests, used mainly for validating areas related to the Query system.

Project configurations

The above Evergreen projects are defined in the following files:

  • etc/evergreen_yml_components/**.yml. YAML files containing definitions for tasks, functions, buildvariants, etc. They are copied from the existing evergreen.yml file.

  • etc/evergreen.yml. Imports components from above and serves as the project config for mongodb-mongo-master, containing all build variants for development, including all feature-specific, patch build required, and suggested variants.

  • etc/evergreen_nightly.yml. The project configuration for mongodb-mongo-master-nightly, containing only build variants for public nightly builds, imports similar components as evergreen.yml to ensure consistency.

  • etc/sys_perf.yml. Configuration file for the system performance project.

  • etc/perf.yml. Configuration for the microbenchmark project.

Release Branching Process

Only the mongodb-mongo-master-nightly project will be branched with required and other necessary variants (e.g. sanitizers) added back in. Most variants in mongodb-mongo-master would be dropped by default but can be re-introduced to the release branches manually on an as-needed basis. For Rapid releases, all but the variants relevant to Atlas in mongodb-mongo-master-nightly may be dropped as well.