Should you build your own merge queue?

A merge queue is a tool that automates the process of integrating changes from multiple pull requests (PRs) in software development, and while it can be quickly prototyped over a weekend, maintaining it involves ongoing commitments that can become complex and resource-intensive as a project scales. Simple merge queues work well for small repositories with low merge volumes, but as the number of PRs increases, challenges such as speculative parallel testing, bisection for identifying faulty PRs in batches, handling flaky tests, managing PR priorities, and ensuring commit integrity arise. These challenges require sophisticated systems and ongoing maintenance, transforming what initially appears to be a straightforward build into a long-term infrastructure responsibility. The decision to build or buy a merge queue should consider not just the initial setup costs but the continuous operational demands, which can redirect resources away from core product development. Ultimately, while creating a bespoke merge queue may be appealing for its customizability and immediate gratification, the enduring maintenance obligations and potential impact on product focus suggest that purchasing a commercial solution might often be a more efficient and reliable choice for larger-scale operations.

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