}
  }


  @J2ktIncompatible // slow enough to cause flakiness
  @GwtIncompatible // far too slow
  public void testSqrtOfPerfectSquareAsDoubleIsPerfect() {
    // This takes just over a minute on my machine.
    for (long n = 0; n <= LongMath.FLOOR_SQRT_MAX_LONG; n++) {
      long actual = (long) Math.sqrt(n * n);
      assertTrue(actual == n);
    }
  }

	data, err := readFile(filename)
	if err != nil {
		return nil, err
	}
	return setupClustersEnvoyConfigWriter(data, out)
}

// TODO(fisherxu): migrate this to config dump when implemented in Envoy
// Issue to track -> https://github.com/envoyproxy/envoy/issues/3362
func setupClustersEnvoyConfigWriter(debug []byte, out io.Writer) (*clusters.ConfigWriter, error) {

	retryCtx, cancel := context.WithCancel(ctx)

	// Indicate to our routine to exit cleanly upon return.
	defer cancel()

	r := rand.New(rand.NewSource(time.Now().UnixNano()))

	// Migrate storage format if needed.
	for {
		// Migrate IAM configuration, if necessary.
		if err := saveIAMFormat(retryCtx, sys.store); err != nil {
			if configRetriableErrors(err) {
				retryInterval := time.Duration(r.Float64() * float64(time.Second))

  config migrate" command. For both commands unknown APIs or fields will throw errors. ([#118013](https://github.com/kubernetes/kubernetes/pull/118013), [@neolit123](https://github.com/neolit123))

- `kubeadm.k8s.io/v1beta2` has been deprecated and will be removed in a future release, possibly in 3 releases (one year). You should start using `kubeadm.k8s.io/v1beta3` for new clusters. To migrate your old configuration files on disk you can use the `kubeadm config migrate` command. ([#107013](https://github.com/kubernetes/kubernetes/pull/107013), [@pacoxu](https://github.com/pacoxu))

 * deep support for asynchronous operations</a>. But if you want to migrate to Caffeine with minimal
 * code changes, you can use <a
 * href="https://www.javadoc.io/doc/com.github.ben-manes.caffeine/guava/latest/com.github.benmanes.caffeine.guava/com/github/benmanes/caffeine/guava/CaffeinatedGuava.html">its

			acc = e.cached.Load()
		}
	}
	atomic.AddInt64(&acc.N, 1)
	atomic.AddInt64(&acc.Total, int64(value))
	atomic.AddInt64(&acc.Size, sz)
}

// total returns the total call count and latency for the last minute.
func (e *lockedLastMinuteLatency) total() AccElem {
	e.mu.Lock()
	defer e.mu.Unlock()
	return e.lastMinuteLatency.getTotal()
}

	// But this time set the "If-Modified-Since" header to be 10 minute more than the actual
	// last modified time of the object.
	request, err = newTestSignedRequest(http.MethodHead, getHeadObjectURL(s.endPoint, bucketName, objectName),
		0, nil, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)
	request.Header.Set("If-Modified-Since", t.Add(10*time.Minute).UTC().Format(http.TimeFormat))
	response, err = s.client.Do(request)

* kube-scheduler now fallbacks to emitting events using core/v1 Events when events.k8s.io/v1beta1 is disabled. ([#83692](https://github.com/kubernetes/kubernetes/pull/83692), [@yastij](https://github.com/yastij))
* Migrate controller-manager and scheduler to EndpointsLeases leader election. ([#84084](https://github.com/kubernetes/kubernetes/pull/84084), [@wojtek-t](https://github.com/wojtek-t))

- If upgrading Cluster Federation components from 1.3.x, be aware the federation-controller-manager now looks for a different secret name.  Run the following to migrate (#28938, @madhusudancs)

```
kubectl --namespace=federation get secret federation-apiserver-secret -o json | sed 's/federation-apiserver-secret/federation-apiserver-kubeconfig/g' | kubectl create -f -