Trunk Merge now offers two modes for creating merge queues: "Single" and "Parallel". The Single mode operates as a standard first-in, first-out merge queue, where pull requests (PRs) are added and merged in the order they arrive. In Parallel mode, Trunk Merge can create multiple queues.

When a PR is added in Parallel mode, it checks if the changes in the PR impact the same areas as other PRs in the queue. Depending on this, the PR is either placed in an existing queue or a new one is created for it. This method allows PRs that don't interfere with each other to be tested and merged simultaneously, improving efficiency while ensuring accurate testing.

Excited to try out parallel mode? Some benefits you can expect are:

  • Parallel PR Testing/Merging: Dynamic queues allow simultaneous merging of related PRs across different code areas, avoiding delays from unrelated PRs.

  • Lower CI Burn: Only PRs affecting the same code areas are retested if a PR in the Merge Queue fails or is removed, lowering CI strain.

  • Scalable Merging: Parallel queues manage any number of PRs regardless of team size by focusing on interdependent PRs.

Getting Started:

Notes:

  • This update aims to enhance productivity and reduce bottlenecks in the merge process, particularly for teams experiencing growth and increased PR volume.

  • Continuous integration and code quality remain a top priority, with the new system designed to uphold these standards while increasing efficiency.