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Labels: optimise creation of signature with/without labels (#10667)

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* Labels: create signature with/without labels

Instead of creating a new Labels slice then converting to signature,
go directly to the signature and save time.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* Labels: refactor Builder tests

Have one test with a range of cases, and have them check the final
output rather than checking the internal structure of the Builder.

Also add a couple of cases where the value is "", which should be
interpreted as 'delete'.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>

* Labels: add 'Keep' function to Builder

This lets us replace `Labels.WithLabels` with the more general `Builder`.

In `engine.resultMetric()` we can call `Keep()` instead of checking
and calling `Del()`.

Avoid calling `Sort()` in `Builder.Labels()` if we didn't add anything,
so that `Keep()` has the same performance as `WithLabels()`.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2022-06-07 05:38:27 +01:00 committed by GitHub
parent 143a760e76
commit 2e2c014d52
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 135 additions and 110 deletions
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57
model/labels/labels.go
View file

@ -202,11 +202,11 @@ func (ls Labels) HashWithoutLabels(b []byte, names ...string) (uint64, []byte) {
return xxhash.Sum64(b), b
}
// WithLabels returns a new labels.Labels from ls that only contains labels matching names.
// BytesWithLabels is just as Bytes(), but only for labels matching names.
// 'names' have to be sorted in ascending order.
func (ls Labels) WithLabels(names ...string) Labels {
ret := make([]Label, 0, len(ls))
func (ls Labels) BytesWithLabels(buf []byte, names ...string) []byte {
b := bytes.NewBuffer(buf[:0])
b.WriteByte(labelSep)
i, j := 0, 0
for i < len(ls) && j < len(names) {
if names[j] < ls[i].Name {
@ -214,30 +214,40 @@ func (ls Labels) WithLabels(names ...string) Labels {
} else if ls[i].Name < names[j] {
i++
} else {
ret = append(ret, ls[i])
if b.Len() > 1 {
b.WriteByte(seps[0])
}
b.WriteString(ls[i].Name)
b.WriteByte(seps[0])
b.WriteString(ls[i].Value)
i++
j++
}
}
return ret
return b.Bytes()
}
// WithoutLabels returns a new labels.Labels from ls that contains labels not matching names.
// BytesWithoutLabels is just as Bytes(), but only for labels not matching names.
// 'names' have to be sorted in ascending order.
func (ls Labels) WithoutLabels(names ...string) Labels {
ret := make([]Label, 0, len(ls))
func (ls Labels) BytesWithoutLabels(buf []byte, names ...string) []byte {
b := bytes.NewBuffer(buf[:0])
b.WriteByte(labelSep)
j := 0
for i := range ls {
for j < len(names) && names[j] < ls[i].Name {
j++
}
if ls[i].Name == MetricName || (j < len(names) && ls[i].Name == names[j]) {
if j < len(names) && ls[i].Name == names[j] {
continue
}
ret = append(ret, ls[i])
if b.Len() > 1 {
b.WriteByte(seps[0])
}
b.WriteString(ls[i].Name)
b.WriteByte(seps[0])
b.WriteString(ls[i].Value)
}
return ret
return b.Bytes()
}
// Copy returns a copy of the labels.
@ -426,6 +436,20 @@ func (b *Builder) Del(ns ...string) *Builder {
return b
}
// Keep removes all labels from the base except those with the given names.
func (b *Builder) Keep(ns ...string) *Builder {
Outer:
for _, l := range b.base {
for _, n := range ns {
if l.Name == n {
continue Outer
}
}
b.del = append(b.del, l.Name)
}
return b
}
// Set the name/value pair as a label.
func (b *Builder) Set(n, v string) *Builder {
if v == "" {
@ -467,8 +491,9 @@ Outer:
}
res = append(res, l)
}
res = append(res, b.add...)
sort.Sort(res)
if len(b.add) > 0 { // Base is already in order, so we only need to sort if we add to it.
res = append(res, b.add...)
sort.Sort(res)
}
return res
}

151
model/labels/labels_test.go
View file

@ -624,81 +624,94 @@ func TestLabels_Map(t *testing.T) {
require.Equal(t, map[string]string{"aaa": "111", "bbb": "222"}, Labels{{"aaa", "111"}, {"bbb", "222"}}.Map())
}
func TestLabels_WithLabels(t *testing.T) {
require.Equal(t, Labels{{"aaa", "111"}, {"bbb", "222"}}, Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}}.WithLabels("aaa", "bbb"))
func TestLabels_BytesWithLabels(t *testing.T) {
require.Equal(t, Labels{{"aaa", "111"}, {"bbb", "222"}}.Bytes(nil), Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}}.BytesWithLabels(nil, "aaa", "bbb"))
require.Equal(t, Labels{}.Bytes(nil), Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}}.BytesWithLabels(nil))
}
func TestLabels_WithoutLabels(t *testing.T) {
require.Equal(t, Labels{{"aaa", "111"}}, Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}}.WithoutLabels("bbb", "ccc"))
require.Equal(t, Labels{{"aaa", "111"}}, Labels{{"aaa", "111"}, {"bbb", "222"}, {MetricName, "333"}}.WithoutLabels("bbb"))
func TestLabels_BytesWithoutLabels(t *testing.T) {
require.Equal(t, Labels{{"aaa", "111"}}.Bytes(nil), Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}}.BytesWithoutLabels(nil, "bbb", "ccc"))
require.Equal(t, Labels{{"aaa", "111"}}.Bytes(nil), Labels{{MetricName, "333"}, {"aaa", "111"}, {"bbb", "222"}}.BytesWithoutLabels(nil, MetricName, "bbb"))
}
func TestBulider_NewBulider(t *testing.T) {
require.Equal(
t,
&Builder{
base: Labels{{"aaa", "111"}},
del: []string{},
add: []Label{},
func TestBuilder(t *testing.T) {
for i, tcase := range []struct {
base Labels
del []string
keep []string
set []Label
want Labels
}{
{
base: FromStrings("aaa", "111"),
want: FromStrings("aaa", "111"),
},
NewBuilder(Labels{{"aaa", "111"}}),
)
}
func TestBuilder_Del(t *testing.T) {
require.Equal(
t,
&Builder{
del: []string{"bbb"},
add: []Label{{"aaa", "111"}, {"ccc", "333"}},
},
(&Builder{
del: []string{},
add: []Label{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}},
}).Del("bbb"),
)
}
func TestBuilder_Set(t *testing.T) {
require.Equal(
t,
&Builder{
base: Labels{{"aaa", "111"}},
del: []string{},
add: []Label{{"bbb", "222"}},
},
(&Builder{
base: Labels{{"aaa", "111"}},
del: []string{},
add: []Label{},
}).Set("bbb", "222"),
)
require.Equal(
t,
&Builder{
base: Labels{{"aaa", "111"}},
del: []string{},
add: []Label{{"bbb", "333"}},
},
(&Builder{
base: Labels{{"aaa", "111"}},
del: []string{},
add: []Label{{"bbb", "222"}},
}).Set("bbb", "333"),
)
}
func TestBuilder_Labels(t *testing.T) {
require.Equal(
t,
Labels{{"aaa", "111"}, {"ccc", "333"}, {"ddd", "444"}},
(&Builder{
base: Labels{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
del: []string{"bbb"},
add: []Label{{"ddd", "444"}},
}).Labels(),
)
want: FromStrings("aaa", "111", "ccc", "333"),
},
{
base: nil,
set: []Label{{"aaa", "111"}, {"bbb", "222"}, {"ccc", "333"}},
del: []string{"bbb"},
want: FromStrings("aaa", "111", "ccc", "333"),
},
{
base: FromStrings("aaa", "111"),
set: []Label{{"bbb", "222"}},
want: FromStrings("aaa", "111", "bbb", "222"),
},
{
base: FromStrings("aaa", "111"),
set: []Label{{"bbb", "222"}, {"bbb", "333"}},
want: FromStrings("aaa", "111", "bbb", "333"),
},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
del: []string{"bbb"},
set: []Label{{"ddd", "444"}},
want: FromStrings("aaa", "111", "ccc", "333", "ddd", "444"),
},
{ // Blank value is interpreted as delete.
base: FromStrings("aaa", "111", "bbb", "", "ccc", "333"),
want: FromStrings("aaa", "111", "ccc", "333"),
},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
set: []Label{{"bbb", ""}},
want: FromStrings("aaa", "111", "ccc", "333"),
},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
keep: []string{"bbb"},
want: FromStrings("bbb", "222"),
},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
keep: []string{"aaa", "ccc"},
want: FromStrings("aaa", "111", "ccc", "333"),
},
{
base: FromStrings("aaa", "111", "bbb", "222", "ccc", "333"),
del: []string{"bbb"},
set: []Label{{"ddd", "444"}},
keep: []string{"aaa", "ddd"},
want: FromStrings("aaa", "111", "ddd", "444"),
},
} {
t.Run(fmt.Sprint(i), func(t *testing.T) {
b := NewBuilder(tcase.base)
for _, lbl := range tcase.set {
b.Set(lbl.Name, lbl.Value)
}
if len(tcase.keep) > 0 {
b.Keep(tcase.keep...)
}
b.Del(tcase.del...)
require.Equal(t, tcase.want, b.Labels())
})
}
}
func TestLabels_Hash(t *testing.T) {

26
promql/engine.go
View file

@ -2050,14 +2050,16 @@ func (ev *evaluator) VectorBinop(op parser.ItemType, lhs, rhs Vector, matching *
}
func signatureFunc(on bool, b []byte, names ...string) func(labels.Labels) string {
sort.Strings(names)
if on {
sort.Strings(names)
return func(lset labels.Labels) string {
return string(lset.WithLabels(names...).Bytes(b))
return string(lset.BytesWithLabels(b, names...))
}
}
names = append([]string{labels.MetricName}, names...)
sort.Strings(names)
return func(lset labels.Labels) string {
return string(lset.WithoutLabels(names...).Bytes(b))
return string(lset.BytesWithoutLabels(b, names...))
}
}
@ -2092,15 +2094,7 @@ func resultMetric(lhs, rhs labels.Labels, op parser.ItemType, matching *parser.V
if matching.Card == parser.CardOneToOne {
if matching.On {
Outer:
for _, l := range lhs {
for _, n := range matching.MatchingLabels {
if l.Name == n {
continue Outer
}
}
enh.lb.Del(l.Name)
}
enh.lb.Keep(matching.MatchingLabels...)
} else {
enh.lb.Del(matching.MatchingLabels...)
}
@ -2295,16 +2289,14 @@ func (ev *evaluator) aggregation(op parser.ItemType, grouping []string, without
group, ok := result[groupingKey]
// Add a new group if it doesn't exist.
if !ok {
var m labels.Labels
lb.Reset(metric)
if without {
lb.Reset(metric)
lb.Del(grouping...)
lb.Del(labels.MetricName)
m = lb.Labels()
} else {
m = metric.WithLabels(grouping...)
lb.Keep(grouping...)
}
m := lb.Labels()
newAgg := &groupedAggregation{
labels: m,
value: s.V,

11
promql/functions.go
View file

@ -791,7 +791,6 @@ func funcPredictLinear(vals []parser.Value, args parser.Expressions, enh *EvalNo
func funcHistogramQuantile(vals []parser.Value, args parser.Expressions, enh *EvalNodeHelper) Vector {
q := vals[0].(Vector)[0].V
inVec := vals[1].(Vector)
sigf := signatureFunc(false, enh.lblBuf, labels.BucketLabel)
if enh.signatureToMetricWithBuckets == nil {
enh.signatureToMetricWithBuckets = map[string]*metricWithBuckets{}
@ -809,19 +808,15 @@ func funcHistogramQuantile(vals []parser.Value, args parser.Expressions, enh *Ev
// TODO(beorn7): Issue a warning somehow.
continue
}
l := sigf(el.Metric)
// Add the metric name (which is always removed) to the signature to prevent combining multiple histograms
// with the same label set. See https://github.com/prometheus/prometheus/issues/9910
l = l + el.Metric.Get(model.MetricNameLabel)
mb, ok := enh.signatureToMetricWithBuckets[l]
enh.lblBuf = el.Metric.BytesWithoutLabels(enh.lblBuf, labels.BucketLabel)
mb, ok := enh.signatureToMetricWithBuckets[string(enh.lblBuf)]
if !ok {
el.Metric = labels.NewBuilder(el.Metric).
Del(excludedLabels...).
Labels()
mb = &metricWithBuckets{el.Metric, nil}
enh.signatureToMetricWithBuckets[l] = mb
enh.signatureToMetricWithBuckets[string(enh.lblBuf)] = mb
}
mb.buckets = append(mb.buckets, bucket{upperBound, el.V})
}