Merge Queue
Software EngineeringA system that batches and sequences pull requests so they can be tested and merged safely at higher throughput.
Think of it like an airport takeoff queue: instead of every plane racing for the runway at once, departures are sequenced and checked so traffic can move faster without colliding.
A merge queue is an automation layer used by code hosting platforms to manage many pull requests targeting the same branch. Instead of merging each pull request immediately, the queue groups, orders, and validates them so teams can keep CI stable while maintaining higher merge velocity.
Merge queues are especially useful in busy repositories where many changes land in parallel. They reduce the chance that one pull request will pass tests alone but fail after another pull request merges ahead of it. The tradeoff is extra complexity in how temporary refs, merge bases, and batched validation are computed.
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Last updated: April 30, 2026