5faf8f4c52
The updated CPUManager from PR #84462 implements logic to migrate the CPUManager checkpoint file from an old format to a new one. To do so, it defines the following types: ``` type CPUManagerCheckpoint = CPUManagerCheckpointV2 type CPUManagerCheckpointV1 struct { ... } type CPUManagerCheckpointV2 struct { ... } ``` This replaces the old definition of just: ``` type CPUManagerCheckpoint struct { ... } ``` Code was put in place to ensure proper migration from checkpoints in V1 format to checkpoints in V2 format. However (and this is a big however), all of the unit tests were performed on V1 checkpoints that were generated using the type name `CPUManagerCheckpointV1` and not the original type name of `CPUManagerCheckpoint`. As such, the checksum in the checkpoint file uses the `CPUManagerCheckpointV1` type to calculate its checksum and not the original type name of `CPUManagerCheckpoint`. This causes problems in the real world since all pre-1.18 checkpoint files will have been generated with the original type name of `CPUManagerCheckpoint`. When verifying the checksum of the checkpoint file across an upgrade to 1.18, the checksum is calculated assuming a type name of `CPUManagerCheckpointV1` (which is incorrect) and the file is seen to be corrupt. This patch ensures that all V1 checksums are verified against a type name of `CPUManagerCheckpoint` instead of ``CPUManagerCheckpointV1`. It also locks the algorithm used to calculate the checksum in place, since it wil never change in the future (for pre-1.18 checkpoint files at least). |
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Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts. It provides basic mechanisms for deployment, maintenance, and scaling of applications.
Kubernetes builds upon a decade and a half of experience at Google running production workloads at scale using a system called Borg, combined with best-of-breed ideas and practices from the community.
Kubernetes is hosted by the Cloud Native Computing Foundation (CNCF). If your company wants to help shape the evolution of technologies that are container-packaged, dynamically scheduled, and microservices-oriented, consider joining the CNCF. For details about who's involved and how Kubernetes plays a role, read the CNCF announcement.
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