791d1c81f0
Add live list of pods to PVC protection controller, as opposed to doing only a cache-based list through the Informer. Both lists are performed while processing a PVC with deletionTimestamp set to check whether Pods using the PVC exist and remove the finalizer to enable deletion of the PVC if that's not the case. Prior to this commit only the cache-based list was done but that's unreliable because a pod using the PVC might exist but not be in the cache just yet. On the other hand, the live list is 100% reliable. Note that it would be enough to do only the live list. Instead, this commit adds it after the cache-based list and performs it only if the latter finds no Pod blocking deletion of the PVC being processed. The rationale is that live lists are expensive and it's desirable to minimize them. The drawback is that if at the time of the cache-based list the cache has not been notified yet of the deletion of a Pod using the PVC the PVC is kept. Correctness is not compromised because the finalizer will be removed when the Pod deletion notification is received, but this means PVC deletion is delayed. Reducing live lists was valued more than deleting PVCs slightly faster. Also, add a unit test that fails without the change introduced by this commit and revamp old unit tests. The latter is needed because expected behavior is described in terms of API calls the controller makes, and this commit introduces new API calls (the live lists). |
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Kubernetes
Kubernetes is an open source system for managing containerized applications across multiple hosts; providing 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 you are a company that 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.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To start developing Kubernetes
The community repository hosts all information about building Kubernetes from source, how to contribute code and documentation, who to contact about what, etc.
If you want to build Kubernetes right away there are two options:
You have a working Go environment.
go get -d k8s.io/kubernetes
cd $GOPATH/src/k8s.io/kubernetes
make
You have a working Docker environment.
git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release
For the full story, head over to the developer's documentation.
Support
If you need support, start with the troubleshooting guide, and work your way through the process that we've outlined.
That said, if you have questions, reach out to us one way or another.