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On this page
  • Setting Priorities
  • How Priority Affects PR Order
Edit on GitHub
  1. Merge Queue

Priority

Control the order pull requests are tested and merged in the Merge Queue

Last updated 1 month ago

When a high-priority change must be merged quickly but still validated by the Merge queue, you can use PR Prioritization to create a PR that goes through the queue faster than others.

Setting Priorities

You specify a custom priority for a pull request at the time of insertion into the queue:

/trunk merge --priority=<level>

or

/trunk merge -p <level>
trunk merge <pr-number> --priority=<level>

or

trunk merge <pr-number> -p <level>

The priority can also be specified from the .

Valid values for the priority level:

label
number
note

urgent

0

urgent items will interrupt running jobs and begin testing immediately

high

10

medium

100

default priority

low

200

255

lowest possible priority

How Priority Affects PR Order

PRs with a higher priority will always begin testing before any other PR that isn't currently being tested, ensuring that prioritized PRs move into the queue as soon as they can. A PR without a priority will use the default medium (100) priority. If there is already a PR in the queue with the same priority, then the new one will be behind it.

When prioritizing a PR, Merge will explicitly not interrupt any currently testing PR, as restarting testing on PRs is usually costly, even if you want another PR to be sooner. Because of this, if a PR is submitted with a priority and there is still room in the queue to begin testing PRs, it will begin testing as normal without interrupting other PRs.

There is an exception to this rule. Sometimes, when there is a PR urgent enough to get in that it is worth the cost of restarting a currently testing PR, you can move the new PR to the front using the "urgent" priority. This is the only time Merge will reschedule a PR that is already in testing.

Example:

Say you have a queue that is configured to test two PRs at once. The queue currently looks like this:

If you submit a PR D with a "high" priority it will be put in front of C (since it is a higher priority than C and C is not testing). D will begin as soon as either A or B finishes, like this:

Instead, if you submit PR D with an "urgent" priority, then D would be tested immediately, A would be restarted, and B would be bumped back to pending, like this:

Merge Web UI
Queue with two testing PRs and one pending
Queue with two testing PRs and a new higher priority pending PR
Queue with an urgent PR moved to the front and a normal PR restarting
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