node.ResourceVersion must not be set when creating a node.
This issue prevents vk from resolving issues after the vk node instance
has been deleted (for whatever reason).
* Patch the node status instead of updating it.
Virtual-kubelet updates the node status periodically.
This change proposes we use the `Patch` API instead of `Update`,
to update the node status.
This avoids overwriting any node updates made by other controllers
in the system, for example a attach-detach controller.
Patch API does a strategic merge instead of overwriting
the entire object, which ensures parallel updates don't overwrite
each other.
Note: `PatchNodeStatus` reduces the time precision to the seconds-level
and therefore I corrected the test for this.
consider two controllers:
CONTROLLER 1 (virtual kubelet) | CONTROLLER 2
oldNode := nodes.Get(nodename) |
| node := nodes.Get(nodename)
| // update status with attached volumes info
| updateNode := Nodes.UpdateStatus(node)
// update vkubelet info on node status |
latestNode := Nodes.UpdateStatus(oldNode) |
<-- latestNode does not contain the volume info added by second controller.
with my patch change:
CONTROLLER 1 (virtual kubelet) | CONTROLLER 2
oldNode := Nodes.Get(nodename) |
| node := Nodes.Get(nodename)
| // update status with attached volumes info
| updateNode := Nodes.UpdateStatus(node)
node := oldNode.DeepCopy() |
// update vkubelet info on node status |
latestNode := util.PatchNodeStatus(oldNode, node) |
<-- latestNode contains the volume info added by second controller.
Testing Done: make test
* Introduce PatchNodeStatus into vkubelet.
* Pass only the node interface.
This starts the work of having a `NodeProvider` which is responsible for
providing node details.
It splits the responsibilities of node management off to a new
controller.
The primary change here is to add the framework pieces for node
management and move the VK CLI to use this new controller.
It also adds support for node leases where available. This can be
enabled via the command line (disabled by default), but may fall back if
we find that leaess aren't supported on the cluster.
