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The main difference is in the conflict-detection system. Whereas bors only has a single queue, this new system can have one queue for each set of changes which doesn't interact with any other set. Eg. if you've got an ios app, a webapp, and a bunch of documentation all in the same repo, then this system will automatically work out that changes to each of those independent projects can be tested and merged in parallel, because they can't possibly conflict.

It relies on understanding the inputs and outputs for all CI build steps to work out how changes to particular files might conflict.

Also, it has a much more sophisticated understanding of how likely a change is to be the source of failure, which it updates in response to repeated test runs. It can then prioritise the changes which are most likely to succeed.




Is the logic of which queue what files trigger automatically or manually determined?




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