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There are many use cases for scheduling in the world, and the maintainers regard extendability as crucial. Kube-scheduler has two major ways to extend it, webhook and Go SDK. However, these come with drawbacks; performance/extendability issues with webhook, and the need to rebuild and replace schedulers with Go SDK. The proposed talk seeks to introduce our new solution to these challenges - a WebAssembly based extension. We’ll begin with a story about why custom schedulers are needed, and how existing extensions work. Then, we’ll get into why architecturally WebAssembly is a great fit for plugins, while also covering its challenges, such as sandbox limitations and programming concerns. This session will be delivered by Kensei, SIG-Scheduling core maintainer who founded the wasm extension. When you leave this session, you will know first-hand how a complex WebAssembly project looks and feels, with concrete details of how WebAssembly fits into infrastructure extensibility in general.
Kensei Nakada is a platform engineer at Tetrate. In the community, he is a sig-scheduling approver, and a core maintainer of the project kube-scheduler-simulator and kube-scheduler-wasm-extension.
