func (z *erasureServerPools) updateRebalanceStats(ctx context.Context) error {
	var ok bool
	for i := range z.serverPools {
		if z.findIndex(i) == -1 {
			// Also ensure to initialize rebalanceStats to indicate
			// its a new pool that can receive rebalanced data.
			z.rebalMeta.PoolStats = append(z.rebalMeta.PoolStats, &rebalanceStats{})
			ok = true
		}
	}
	if ok {
		lock := z.serverPools[0].NewNSLock(minioMetaBucket, rebalMetaName)

	default:
		return n, nil
	}
}

func (sw *sparseFileWriter) ReadFrom(r io.Reader) (n int64, err error) {
	rs, ok := r.(io.ReadSeeker)
	if ok {
		if _, err := rs.Seek(0, io.SeekCurrent); err != nil {
			ok = false // Not all io.Seeker can really seek
		}
	}
	if !ok {
		return io.Copy(struct{ io.Writer }{sw}, r)
	}

	var readLastByte bool
	pos0 := sw.pos

	return
}

func tokenDataFromSecret(tokenSecret *v1.Secret) (ca, token []byte, err error) {
	var ok bool
	ca, ok = tokenSecret.Data[v1.ServiceAccountRootCAKey]
	if !ok {
		err = errMissingRootCAKey
		return
	}
	token, ok = tokenSecret.Data[v1.ServiceAccountTokenKey]
	if !ok {
		err = errMissingTokenKey
		return
	}
	return
}

	// if an apply patch occurs for an object that doesn't yet exist, create it.
	if patch.Type() != types.ApplyPatchType {
		return clnt.Patch(ctx, obj, patch, opts...)
	}
	check, ok := obj.DeepCopyObject().(client.Object)
	if !ok {
		return errors.New("could not check for object in fake client")
	}
	if err := clnt.Get(ctx, client.ObjectKeyFromObject(obj), check); kerrors.IsNotFound(err) {

		}
		if kdf, ok := test.metadata[crypto.MetaAlgorithm]; !ok {
			t.Errorf("Test %d: ServerSideEncryptionKDF must be part of metadata: %v", i, kdf)
		}
		if iv, ok := test.metadata[crypto.MetaIV]; !ok {
			t.Errorf("Test %d: crypto.SSEIV must be part of metadata: %v", i, iv)
		}
		if mac, ok := test.metadata[crypto.MetaSealedKeySSEC]; !ok {

		for {
		outerLoop:
			watchCh := ies.client.Watch(ctx,
				keyPath, etcd.WithPrefix(), etcd.WithKeysOnly())

			for {
				select {
				case <-ctx.Done():
					return
				case watchResp, ok := <-watchCh:
					if !ok {
						time.Sleep(1 * time.Second)
						// Upon an error on watch channel
						// re-init the watch channel.
						goto outerLoop
					}
					if err := watchResp.Err(); err != nil {

		responses, err = queryEachShard(all, dr, istioNamespace, kubeClient, centralOpts)
	}
	if err != nil {
		if _, ok := err.(ControlPlaneNotFoundError); ok {
			// Attempt to get the XDS address from the webhook and try again
			addr, err := getXdsAddressFromWebhooks(kubeClient)
			if err == nil {
				centralOpts.Xds = addr.host

}

func (target *KafkaTarget) addToBatch(key store.Key) error {
	if target.batch.IsFull() {
		if err := target.commitBatch(); err != nil {
			return err
		}
	}
	if _, ok := target.batch.GetByKey(key.Name); !ok {
		eventData, err := target.store.Get(key.Name)
		if err != nil {
			if os.IsNotExist(err) {
				return nil
			}
			return err
		}
		msg, err := target.toProducerMessage(eventData)

		const testPayload = "Hello Grid World!"
		// Single requests should have remote errors.
		_, err := remoteConn.Request(context.Background(), handlerTest, []byte(testPayload))
		if v, ok := err.(*RemoteErr); !ok || v.Error() != "Invalid Handler for type" {
			t.Fatalf("Unexpected error: %v, %T", err, err)
		}
		// Streams should not be able to set up until registered.
		// Thus, the error is a local error.

}

func collectDriveMetrics(m madmin.RealtimeMetrics) {
	latestDriveStatsMu.Lock()
	for d, dm := range m.ByDisk {
		labels := map[string]string{"drive": d}
		latestStats, ok := latestDriveStats[d]
		if !ok {
			latestDriveStats[d] = dm.IOStats
			continue
		}
		updateDriveIOStats(dm.IOStats, latestStats, labels)
		latestDriveStats[d] = dm.IOStats
	}
	lastDriveStatsRefresh = time.Now().UTC()