- Fix a race condition in kube-controller-manager and scheduler caused by a bug in transforming informer happening when objects were accessed during Resync operation by making the transforming function idempotent. ([#124352](https://github.com/kubernetes/kubernetes/pull/124352), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery and Scheduling]

	// the sweepLocker to be invalid, since sweeping is done.
	//
	// N.B. Below we might duplicate some work from gcSweep; this is
	// fine as all that work is idempotent within a GC cycle, and
	// we're still holding worldsema so a new cycle can't start.
	sl := sweep.active.begin()
	if !stwSwept && !sl.valid {
		throw("failed to set sweep barrier")

//
// A note on latency: for sufficiently small heaps (<10s of GiB) this function will take constant
// time, but may take time proportional to the size of the mapped heap beyond that.
//
// This function is idempotent.
//
// The heap lock must not be held over this operation, since it will briefly acquire
// the heap lock.
//
// Must be called on the system stack because it acquires the heap lock.
//
//go:systemstack

	// if the object being admitted is modified by other admission plugins after the initial webhook call.
	// Webhooks that specify this option *must* be idempotent, able to process objects they previously admitted.
	// Note:
	// * the number of additional invocations is not guaranteed to be exactly one.

	return statusPending(logger, "waiting for resource driver to provide information", "pod", klog.KObj(pod))
}

// Unreserve clears the ReservedFor field for all claims.
// It's idempotent, and does nothing if no state found for the given pod.
func (pl *dynamicResources) Unreserve(ctx context.Context, cs *framework.CycleState, pod *v1.Pod, nodeName string) {
	if !pl.enabled {
		return
	}

		// update its dependencies.
		return
	}

	if !pkg.isTest() {
		// Check whether we should add (or update the flags for) a test for pkg.
		// ld.pkgTest is idempotent and extra invocations are inexpensive,
		// so it's ok if we call it more than is strictly necessary.
		wantTest := false
		switch {
		case ld.allPatternIsRoot && MainModules.Contains(pkg.mod.Path):

  // some resources may allow a client to request the generation of an appropriate name
  // automatically. Name is primarily intended for creation idempotence and configuration
  // definition.
  // Cannot be updated.
  // More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names
  // +optional
  optional string name = 1;

  // some resources may allow a client to request the generation of an appropriate name
  // automatically. Name is primarily intended for creation idempotence and configuration
  // definition.
  // Cannot be updated.
  // More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names
  // +optional
  optional string name = 1;

	// some resources may allow a client to request the generation of an appropriate name
	// automatically. Name is primarily intended for creation idempotence and configuration
	// definition.
	// Cannot be updated.
	// More info: https://kubernetes.io/docs/concepts/overview/working-with-objects/names#names
	// +optional

  // post order gives a maximal clustering) holds.  Once the linear time
  // post-order scheme has been battle tested we can move this to happen only in
  // debug builds.
  VLOG(2) << "Checking idempotence";
  TF_ASSIGN_OR_RETURN(bool changed,
                      ForEachEdgeInPostOrder([&](Cluster* from, Cluster* to) {
                        return TryToContractEdge(from, to);
                      }));