It's easy to get update conflict when processing a DaemonSet
continuously. storeDaemonSetStatus had a retry logic that it gets the
resource from apiserver to update the DaemonSet with the latest resource
version. However, it never really retried because of a wrong check and
always made an useless get call. This patch fixes the logic to allow
the function retry once on update error.
The nodeShouldRunDaemonPod method does not need to return an error
because there are no scenarios under which it fails. Remove the
error return path for its direct calls as well.
In order to maintain the correct invariants, the existing maxUnavailable
logic calculated the same data several times in different ways. Leverage
the simpler structure from maxSurge and calculate pod availability only
once, as well as perform only a single pass over all the pods in the
daemonset. This changed no behavior of the current controller, and
has a structure that is almost identical to maxSurge.
If MaxSurge is set, the controller will attempt to double up nodes
up to the allowed limit with a new pod, and then when the most recent
(by hash) pod is ready, trigger deletion on the old pod. If the old
pod goes unready before the new pod is ready, the old pod is immediately
deleted. If an old pod goes unready before a new pod is placed on that
node, a new pod is immediately added for that node even past the MaxSurge
limit.
The backoff clock is used consistently throughout the daemonset controller
as an injectable clock for the purposes of testing.
It is too easy to omit checking the return value for the
syncAndValidateDaemonSet test in large suites. Switch the method
type to be a test helper and fatal/error directly. Also rename
a method that referenced the old name 'Rollback' instead of
'RollingUpdate'.
This is part of the goal for scheduling to remove dependencies on internal
packages for the scheduling framework. It also provides these functions in an
external location for other components and projects to import.
fixed syntax, wrote a test
fixed a test
.
1
Update staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr_test.go
Co-Authored-By: Joel Speed <Joel.speed@hotmail.co.uk>
added test
.
fix
fix test
fixed a test
gofmt
lint
fix
function name
validation fix
.
godocs added
.
Instead of reporting an event or displaying an error, simply exit
when the namespace is being terminated. This reduces the amount of
controller churn on namespace shutdown. While we could technically
exit the entire processing loop early for very large daemon sets,
we should wait for more evidence that is an issue before changing
that logic substantially.
