k8s.io/kubernetes@v1.29.3/pkg/kubelet/checkpointmanager/README.md (about)

     1  ## DISCLAIMER
     2  - Sig-Node community has reached a general consensus, as a best practice, to
     3  avoid introducing any new checkpointing support. We reached this understanding
     4  after struggling with some hard-to-debug issues in the production environments
     5  caused by the checkpointing.
     6  - 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.
     7  
     8  ## Introduction
     9  This folder contains a framework & primitives, Checkpointing Manager, which is
    10  used by several other Kubelet submodules, `dockershim`, `devicemanager`, `pods`
    11  and `cpumanager`, to implement checkpointing at each submodule level. As already
    12  explained in above `Disclaimer` section, think twice before introducing any further
    13  checkpointing in Kubelet. If still checkpointing is required, then this folder
    14  provides the common APIs and the framework for implementing checkpointing.
    15  Using same APIs across all the submodules will help maintaining consistency at
    16  Kubelet level.
    17  
    18  Below is the history of checkpointing support in Kubelet.
    19  
    20  | Package | First checkpointing support merged on | PR link |
    21  | ------- | --------------------------------------| ------- |
    22  |kubelet/dockershim | Feb 3, 2017 | [[CRI] Implement Dockershim Checkpoint](https://github.com/kubernetes/kubernetes/pull/39903)
    23  |devicemanager| Sep 6, 2017 | [Deviceplugin checkpoint](https://github.com/kubernetes/kubernetes/pull/51744)
    24  | kubelet/pod | Nov 22, 2017 | [Initial basic bootstrap-checkpoint support](https://github.com/kubernetes/kubernetes/pull/50984)
    25  |cpumanager| Oct 27, 2017 |[Add file backed state to cpu manager ](https://github.com/kubernetes/kubernetes/pull/54408)