# Witness Protocol Feature - Detailed Design Document

## 1. Overview

The SMB Witness Protocol enables rapid notification of resource changes in a clustered file server environment. It provides fast failover capabilities by allowing clients to register for notifications about server node availability, share movement, and other critical cluster events.

## 2. Protocol Specification Reference

- **MS-SWN**: Service Witness Protocol Specification

import java.util.Set;
import org.jspecify.annotations.Nullable;

/**
 * {@link Table} implementation backed by a map that associates row keys with column key / value
 * secondary maps. This class provides rapid access to records by the row key alone or by both keys,
 * but not by just the column key.
 *
 * <p>The views returned by {@link #column}, {@link #columnKeySet()}, and {@link #columnMap()} have

        totalSize++;
        if (wasEmpty) {
          addToMap();
        }
      }
    }
  }

  /**
   * List decorator that stays in sync with the multimap values for a key and supports rapid random
   * access.
   */
  private final class RandomAccessWrappedList extends WrappedList implements RandomAccess {
    RandomAccessWrappedList(

        totalSize++;
        if (wasEmpty) {
          addToMap();
        }
      }
    }
  }

  /**
   * List decorator that stays in sync with the multimap values for a key and supports rapid random
   * access.
   */
  private final class RandomAccessWrappedList extends WrappedList implements RandomAccess {
    RandomAccessWrappedList(

- Resolved a performance regression in default 1.31+ configurations, related to the `ConsistentListFromCache` feature, where rapid create/update API requests across different namespaces encounter increased latency. ([#130113](https://github.com/kubernetes/kubernetes/pull/130113), [@AwesomePatrol](https://github.com/AwesomePatrol))

				"application/vnd.pvi.ptid1",
				"application/vnd.pwg-multiplexed",
				"application/vnd.pwg-xhtml-print+xml",
				"application/vnd.qualcomm.brew-app-res",
				"application/vnd.quark.quarkxpress",
				"application/vnd.rapid",
				"application/vnd.recordare.musicxml",
				"application/vnd.recordare.musicxml+xml",
				"application/vnd.renlearn.rlprint",
				"application/vnd.rim.cod",
				"application/vnd.rn-realmedia",

failures and now perform a more rigorous reconciliation to ensure static pods (especially those that use fixed UIDs) are restarted.  As a side effect of these changes static pods will be restarted with lower latency than before (2s vs 4s, on average) and rapid updates to pod configuration should take effect sooner.
  
  A new metric `kubelet_known_pods` has been added at ALPHA stability to report the number of pods a Kubelet is tracking in a number of internal states.  Operators may use the metrics...

- Print go stack traces at -v=4 and not -v=2 ([#94663](https://github.com/kubernetes/kubernetes/pull/94663), [@soltysh](https://github.com/soltysh)) [SIG CLI]
- Recreate EndpointSlices on rapid Service creation. ([#94730](https://github.com/kubernetes/kubernetes/pull/94730), [@robscott](https://github.com/robscott))

#### DaemonSet
* [beta] DaemonSet supports history and rollback. See [Performing a Rollback on a DaemonSet](https://kubernetes.io/docs/tasks/manage-daemon/rollback-daemon-set/).

- Resolves a performance regression in default 1.31+ configurations, related to the ConsistentListFromCache feature, where rapid create / update API requests across different namespaces encounter increased latency. ([#130136](https://github.com/kubernetes/kubernetes/pull/130136), [@AwesomePatrol](https://github.com/AwesomePatrol)) [SIG API Machinery]