err = msgp.WrapError(err, "DeleteMarkers")
				return
			}
		case "szs":
			var zb0002 uint32
			zb0002, err = dc.ReadArrayHeader()
			if err != nil {
				err = msgp.WrapError(err, "ObjSizes")
				return
			}
			if zb0002 != uint32(dataUsageBucketLen) {
				err = msgp.ArrayError{Wanted: uint32(dataUsageBucketLen), Got: zb0002}
				return
			}
			for za0001 := range z.ObjSizes {

	// flags.
	if h.raw && !h.hasDataDescriptor() {
		b.uint32(h.CRC32)
		b.uint32(uint32(min(h.CompressedSize64, uint32max)))
		b.uint32(uint32(min(h.UncompressedSize64, uint32max)))
	} else {
		// When this package handle the compression, these values are
		// always written to the trailing data descriptor.
		b.uint32(0) // crc32
		b.uint32(0) // compressed size
		b.uint32(0) // uncompressed size
	}
	b.uint16(uint16(len(h.Name)))

		o = msgp.AppendMapHeader(o, uint32(len(z.MetaSys)))
		for za0002, za0003 := range z.MetaSys {
			o = msgp.AppendString(o, za0002)
			o = msgp.AppendBytes(o, za0003)
		}
	}
	return
}

// UnmarshalMsg implements msgp.Unmarshaler
func (z *xlMetaV2DeleteMarker) UnmarshalMsg(bts []byte) (o []byte, err error) {
	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, bts, err = msgp.ReadMapHeaderBytes(bts)

	var field []byte
	_ = field
	var zb0001 uint32
	zb0001, err = dc.ReadMapHeader()
	if err != nil {
		err = msgp.WrapError(err)
		return
	}
	for zb0001 > 0 {
		zb0001--
		field, err = dc.ReadMapKeyPtr()
		if err != nil {
			err = msgp.WrapError(err)
			return
		}
		switch msgp.UnsafeString(field) {
		case "r":
			var zb0002 uint32
			zb0002, err = dc.ReadArrayHeader()
			if err != nil {

	o = msgp.AppendArrayHeader(o, uint32(len(z.Distribution)))
	for za0001 := range z.Distribution {
		o = msgp.AppendInt(o, z.Distribution[za0001])
	}
	// string "Checksums"
	o = append(o, 0xa9, 0x43, 0x68, 0x65, 0x63, 0x6b, 0x73, 0x75, 0x6d, 0x73)
	o = msgp.AppendArrayHeader(o, uint32(len(z.Checksums)))
	for za0002 := range z.Checksums {

			t.Fatalf("Failed to tear down store; %v", err)
		}
	}()
	store, err := setUpQueueStore(queueDir, 100)
	if err != nil {
		t.Fatalf("Failed to create a queue store; %v", err)
	}

	var limit uint32 = 100

	batch := NewBatch[TestItem](BatchConfig[TestItem]{
		Limit:         limit,
		Store:         store,
		CommitTimeout: 5 * time.Minute,
		Log: func(ctx context.Context, err error, id string, errKind ...interface{}) {

	}
}

var initialized = &sync.Once{}

func setup(t *testing.T) {
	initialized.Do(func() {
		// Setup group namespace so iptables --gid-owner will work
		assert.NoError(t, userns.WriteGroupMap(map[uint32]uint32{userns.OriginalGID(): 0}))
		// Istio iptables expects to find a non-localhost IP in some interface
		assert.NoError(t, exec.Command("ip", "addr", "add", "240.240.240.240/32", "dev", "lo").Run())

const defaultCommitTimeout = 30 * time.Second

// Batch represents an ordered batch
type Batch[I any] struct {
	items  []I
	limit  uint32
	store  Store[I]
	quitCh chan struct{}

	sync.Mutex
}

// BatchConfig represents the batch config
type BatchConfig[I any] struct {
	Limit         uint32
	Store         Store[I]
	CommitTimeout time.Duration
	Log           logger
}

// Add adds the item to the batch

// If cycles is 0 false is always returned.
// If cycles is 1 true is always returned (as expected).
func (h dataUsageHash) mod(cycle uint32, cycles uint32) bool {
	if cycles <= 1 {
		return cycles == 1
	}
	return uint32(xxhash.Sum64String(string(h)))%cycles == cycle%cycles
}

// modAlt returns true if the hash mod cycles == cycle.
// This is out of sync with mod.

		UncompressedSize64: 5678,
	}); err != nil {
		t.Fatal(err)
	}
	if err := w.Close(); err != nil {
		t.Fatal(err)
	}
	b := buf.Bytes()

	var sig [4]byte
	binary.LittleEndian.PutUint32(sig[:], uint32(fileHeaderSignature))

	idx := bytes.Index(b, sig[:])
	if idx == -1 {
		t.Fatal("file header not found")
	}
	b = b[idx:]