// traverseAndHeal - traverses on-disk data and performs healing
// according to settings. At each "safe" point it also checks if an
// external quit signal has been received and quits if so. Since the
// healing traversal may be mutating on-disk data when an external
// quit signal is received, this routine cannot quit immediately and
// has to wait until a safe point is reached, such as between scanning
// two objects.

    private FieldSettersHolder() {}
  }

  ImmutableMultimap(ImmutableMap<K, ? extends ImmutableCollection<V>> map, int size) {
    this.map = map;
    this.size = size;
  }

  // mutators (not supported)

  /**
   * Guaranteed to throw an exception and leave the multimap unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */

- Introduced `v1alpha1` API for mutating admission policies, enabling extensible #     admission control via CEL expressions (KEP  3962: Mutating Admission Policies). #     To use, enable the `MutatingAdmissionPolicy` feature gate and the `admissionregistration.k8s.io/v1alpha1` #     API via `--runtime-config`. ([#127134](https://github....

### **API Machinery**

#### **Admission Control**

*   Admission webhooks are now in beta, and include the following:
    *   Mutation support for admission webhooks. ([#54892](https://github.com/kubernetes/kubernetes/pull/54892),[ @caesarxuchao](https://github.com/caesarxuchao))

- Kubeadm: retry `kubeadm-config` ConfigMap creation or mutation if the apiserver is not responding. This will improve resiliency when joining new control plane nodes. ([#85763](https://github.com/kubernetes/kubernetes/pull/85763), [@ereslibre](https://github.com/ereslibre)) [SIG Cluster Lifecycle]

- kube-apiserver: Authentication configuration for mutating and validating admission webhooks referenced from an `--admission-control-config-file` can now be specified with `apiVersion: apiserver.config.k8s.io/v1, kind: WebhookAdmissionConfiguration`. ([#85138](https://github.com/kubernetes/kubernetes/pull/85138),...

   * ordering information is updated. This is used to avoid lock contention by recording a memento
   * of reads and delaying a lock acquisition until the threshold is crossed or a mutation occurs.
   *
   * <p>This must be a (2^n)-1 as it is used as a mask.
   */
  static final int DRAIN_THRESHOLD = 0x3F;

  /**

      it.second = strings::StrCat(
          "Operation '", op.node.DebugString(), "' was changed by ",
          mutation_type,
          " after it was run by a session. This mutation will have no effect, "
          "and will trigger an error in the future. Either don't modify "
          "nodes after running them or create a new session.");
    }
  }
}

namespace {

		// is ready to be read.
		//
		// This is possible to be lock free because
		// - xl.meta for inlined objects has already read the data
		//   into memory, any mutation on xl.meta subsequently is
		//   inconsequential to the overall read operation.
		// - xl.meta metadata is still verified for quorum under lock()
		//   however writing the response doesn't need to serialize

- kube-apiserver: setting a `dryRun` query parameter on a CONNECT request will now cause the request to be rejected, consistent with behavior of other mutating API requests. Examples of CONNECT APIs are the `nodes/proxy`, `services/proxy`, `pods/proxy`, `pods/exec`, and `pods/attach` subresources. Note that this prevents sending a `dryRun` parameter to backends via `{nodes,services,pods}/proxy` subresources....