70c9f770d7
Watches against etcd in the API server can hang forever if the etcd cluster loses quorum, e.g. the majority of nodes crashes. This fix improves responsiveness (detection and reaction time) of API server watches against etcd in some rare (but still possible) edge cases so that watches are terminated with `"etcdserver: no leader" (ErrNoLeader)`. Implementation behavior described by jingyih: ``` The etcd server waits until it cannot find a leader for 3 election timeouts to cancel existing streams. 3 is currently a hard coded constant. The election timeout defaults to 1000ms. If the cluster is healthy, when the leader is stopped, the leadership transfer should be smooth. (leader transfers its leadership before stopping). If leader is hard killed, other servers will take an election timeout to realize leader lost and start campaign. ``` For further details, discussion and validation see https://github.com/kubernetes/kubernetes/issues/89488#issuecomment-606491110 and https://github.com/etcd-io/etcd/issues/8980. Closes: https://github.com/kubernetes/kubernetes/issues/89488 Signed-off-by: Michael Gasch <mgasch@vmware.com>
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.
To start using Kubernetes
See our documentation on kubernetes.io.
Try our interactive tutorial.
Take a free course on Scalable Microservices with Kubernetes.
To use Kubernetes code as a library in other applications, see the list of published components.
Use of the k8s.io/kubernetes module or k8s.io/kubernetes/... packages as libraries is not supported.
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.
mkdir -p $GOPATH/src/k8s.io
cd $GOPATH/src/k8s.io
git clone https://github.com/kubernetes/kubernetes
cd 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.