func()

in apimachinery/lease/controller.go [101:125]

• 16 lines of code
• 6 McCabe index (conditional complexity)

func (c *controller) sync() {
	if c.latestLease != nil {
		// As long as the lease is not (or very rarely) updated by any other agent than the component itself,
		// we can optimistically assume it didn't change since our last update and try updating
		// based on the version from that time. Thanks to it we avoid GET call and reduce load
		// on etcd and kube-apiserver.
		// If at some point other agents will also be frequently updating the Lease object, this
		// can result in performance degradation, because we will end up with calling additional
		// GET/PUT - at this point this whole "if" should be removed.
		err := c.retryUpdateLease(c.latestLease)
		if err == nil {
			return
		}
		klog.Infof("failed to update lease using latest lease, fallback to ensure lease, err: %v", err)
	}

	lease, created := c.backoffEnsureLease()
	c.latestLease = lease
	// we don't need to update the lease if we just created it
	if !created && lease != nil {
		if err := c.retryUpdateLease(lease); err != nil {
			klog.Errorf("%v, will retry after %v", err, c.renewInterval)
		}
	}
}