9edf196c01
Automatic merge from submit-queue (batch tested with PRs 67694, 64973, 67902). 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>. Size http2 buffers to allow concurrent streams http/2 requests from a given client multiplex over a single connection via streams, chopped up into frames. The amount of data the client is allowed to send for a given stream and for the overall connection before acknowledgement is determined by the server's MaxUploadBufferPerStream and MaxUploadBufferPerConnection settings respectively, both defaulting to 1MB. The number of concurrent streams a client is allowed to send over a single connection is determined by the server's MaxConcurrentStreams setting, defaulting to 250. We observed a starvation issue with the kube aggregator's proxy client if handling of a POST through the aggregator to a backend server exceeded the 1MB buffer size AND the backend server required a second POST request through the aggregator to be handled before it could drain the first request's body. Logically, if concurrent streams are allowed in a single connection, the connection buffer should be MaxUploadBufferPerStream*MaxConcurrentStreams to allow individual streams to make progress even when one stream is blocked. This PR shrinks the `MaxUploadBufferPerStream` size to 256kb (which is still large enough to allow all the resources we saw in our test clusters to be sent in a single frame), and grows the MaxUploadBufferPerConnection to accomodate concurrent streams. I'm also opening a golang issue, [reproducer](https://gist.github.com/liggitt/00239c99b4c148ac1b23e57f86b3af93), and fix for the defaults for this ```release-note adjusted http/2 buffer sizes for apiservers to prevent starvation issues between concurrent streams ``` |
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README.md
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.