### Other notable changes

* StatefulSet: Set hostname/subdomain fields on new Pods in addition to the deprecated annotations, to allow mitigation of Pod DNS issues upon upgrading to Kubernetes v1.7.x. ([#50942](https://github.com/kubernetes/kubernetes/pull/50942), [@enisoc](https://github.com/enisoc))
* Azure: Allow VNet to be in a separate Resource Group. ([#49725](https://github.com/kubernetes/kubernetes/pull/49725), [@sylr](https://github.com/sylr))

#### Scheduling

- Kubeadm: when adding extra apiserver authorization-modes, the defaults `Node,RBAC` are no longer prepended in the resulting static Pod manifests and a full override is allowed. ([#82616](https://github.com/kubernetes/kubernetes/pull/82616), [@ghouscht](https://github.com/ghouscht))

#### Storage

### Promoted Server Side Unknown Field Validation to Beta

Promoted the `ServerSideFieldValidation` feature gate to beta (on by default). This allows optionally triggering schema validation on the API server that errors when unknown fields are detected. This allows the removal of client-side validation from kubectl while maintaining the same core functionality of erroring out on requests that contain unknown or invalid fields.

    *   New `tf.data.Dataset.reduce()` API allows users to reduce a finite
        dataset to a single element using a user-provided reduce function.
    *   New `tf.data.Dataset.window()` API allows users to create finite windows
        of input dataset; when combined with the `tf.data.Dataset.reduce()` API,
        this allows users to implement customized batching.

			destVol:     "dest-vol",
			srcPath:     "file3",
			destPath:    "file-two",
			expectedErr: nil,
		},
		// TestXLStorage case - 5.
		// TestXLStorage case with io error count set to maximum allowed count.
		// expected not to fail.
		{
			srcVol:      "src-vol",
			destVol:     "dest-vol",
			srcPath:     "file4",
			destPath:    "file-three",
			expectedErr: nil,
		},

* Fixed CSIDriver API object to allow missing fields. ([#69331](https://github.com/kubernetes/kubernetes/pull/69331), [@jsafrane](https://github.com/jsafrane))
* Allows changing nodeName in endpoint update. ([#68575](https://github.com/kubernetes/kubernetes/pull/68575), [@prameshj](https://github.com/prameshj))

			return objInfo, err
		}

		// if object doesn't exist and not a replication request return error for If-Match conditional requests
		// If-None-Match should be allowed to proceed for non-existent objects
		if err != nil && !opts.ReplicationRequest && opts.HasIfMatch && (isErrObjectNotFound(err) || isErrVersionNotFound(err)) {
			return objInfo, err
		}
	}

- Fix `VirtualMachineScaleSets.virtualMachines.GET` not allowed issues when customers have set VMSS orchestrationMode. ([#91097](https://github.com/kubernetes/kubernetes/pull/91097), [@feiskyer](https://github.com/feiskyer))

type eofReader struct {
	buf []byte
}

func (r *eofReader) Read(p []byte) (int, error) {
	read := copy(p, r.buf)
	r.buf = r.buf[read:]

	switch read {
	case 0, len(r.buf):
		// As allowed in the documentation, this will return io.EOF
		// in the same call that consumes the last of the data.
		// https://godoc.org/io#Reader
		return read, io.EOF
	}

	return read, nil
}

- Allowed attached volumes to be mounted quicker by skipping exponential backoff when checking for reported-in-use volumes. ([#106853](https://github.com/kubernetes/kubernetes/pull/106853), [@gnufied](https://github.com/gnufied))