2026-04-01: Remove support for REv2.0 and REv2.1 #202
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On 2019-11-19, REv2 changed the way expected output paths are declared in the Command message. It used to be the case that files and directories were declared separately, but this prevents you from writing an action that captures either of those, depending on what the action generated. Given that this feature was added 6.5 years ago, let's go ahead and remove support for the old scheme. Clients have had more than enough time to implement the new scheme.
REv2.2 promoted the platform properties from the Command message to the Action message. This has the advantage that the scheduler no longer needs to process any Command messages. This saves one round trip to the CAS. Command messages can in some cases also become very large, meaning it adds unnecessary memory pressure on the scheduler. Given that this feature was added on 2020-10-17 and clients were able to adopt quickly. it's time to remove support for the old scheme.
With support for REv2.0 and REv2.1 specific features removed, we should go ahead and bump the deprecated API version to REv2.2. This will force clients to stop using these old features, or simply stop working altogether.
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In the early days of REv2, we made some backward incompatible code changes:
Up until this point we provided support for both the old and new schemes. Support for the old schemes is gated by configuration options on the scheduler and worker. Given that the new schemes were added to the protocol on 2019-11-19 and 2020-10-17, I think it's time to go ahead and remove support for the old schemes. Maintainers of clients have had more than enough time to implement them.