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26 lines
1.7 KiB
Markdown
26 lines
1.7 KiB
Markdown
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## DISCLAIMER
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- Sig-Node community has reached a general consensus, as a best practice, to
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avoid introducing any new checkpointing support. We reached this understanding
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after struggling with some hard-to-debug issues in the production environments
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caused by the checkpointing.
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- Any changes to the checkpointed data structure would be considered incompatible and a component should add its own handling if it needs to ensure backward compatibility of reading old-format checkpoint files.
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## Introduction
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This folder contains a framework & primitives, Checkpointing Manager, which is
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used by several other Kubelet submodules, `dockershim`, `devicemanager`, `pods`
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and `cpumanager`, to implement checkpointing at each submodule level. As already
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explained in above `Disclaimer` section, think twice before introducing any further
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checkpointing in Kubelet. If still checkpointing is required, then this folder
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provides the common APIs and the framework for implementing checkpointing.
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Using same APIs across all the submodules will help maintaining consistency at
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Kubelet level.
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Below is the history of checkpointing support in Kubelet.
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| Package | First checkpointing support merged on | PR link |
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| ------- | --------------------------------------| ------- |
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|kubelet/dockershim | Feb 3, 2017 | [[CRI] Implement Dockershim Checkpoint](https://github.com/kubernetes/kubernetes/pull/39903)
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|devicemanager| Sep 6, 2017 | [Deviceplugin checkpoint](https://github.com/kubernetes/kubernetes/pull/51744)
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| kubelet/pod | Nov 22, 2017 | [Initial basic bootstrap-checkpoint support](https://github.com/kubernetes/kubernetes/pull/50984)
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|cpumanager| Oct 27, 2017 |[Add file backed state to cpu manager ](https://github.com/kubernetes/kubernetes/pull/54408)
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