f8981147e2
Automatic merge from submit-queue (batch tested with PRs 61195, 61479). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. Use RaceFreeFakeWatcher in ObjectTracker to fix racy watch panics **What this PR does / why we need it**: The `FakeWatcher` added to `ObjectTracker` in #57504 allows sends on the result channel after it's closed; for example calling `Stop()` then `Add(obj)` will cause a panic. In my experience this has led to flaky tests when informers and controllers are running. Replacing `FakeWatcher` with `RaceFreeFakeWatcher` fixes the problem, since `RaceFreeFakeWatcher` ignores additional events that occur after the watcher is stopped. It also panics instead of blocking when the result channel is full, which seems like a more useful behavior in tests than blocking. I removed the `FakeWatchBufferSize` constant since `RaceFreeFakeWatcher` doesn't take a buffer size argument anymore. This seems fine since the `DefaultChanSize` constant is close to the `FakeWatchBufferSize` value (100 vs 128). **Special notes for your reviewer**: I can provide a minimal repro of a flaky test caused by the earlier behavior if necessary. **Release note**: ```release-note Fix racy panics when using fake watches with ObjectTracker ``` |
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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.