mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-11-23 20:37:12 +01:00
0686ac52c3
This should improve lookup performance if the same `label=value` pair exists in big number of time series. This should also reduce memory usage for mergeset data cache, since `tag->metricIDs` rows occupy less space than the original `tag->metricID` rows.
672 lines
16 KiB
Go
672 lines
16 KiB
Go
package storage
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import (
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"bytes"
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"fmt"
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"sort"
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"strings"
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"sync"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/encoding"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompb"
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)
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const (
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escapeChar = 0
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tagSeparatorChar = 1
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kvSeparatorChar = 2
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)
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// Tag represents a (key, value) tag for metric.
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type Tag struct {
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Key []byte
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Value []byte
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}
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// Reset resets the tag.
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func (tag *Tag) Reset() {
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tag.Key = tag.Key[:0]
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tag.Value = tag.Value[:0]
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}
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// Equal returns true if tag equals t
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func (tag *Tag) Equal(t *Tag) bool {
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return string(tag.Key) == string(t.Key) && string(tag.Value) == string(t.Value)
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}
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// Marshal appends marshaled tag to dst and returns the result.
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func (tag *Tag) Marshal(dst []byte) []byte {
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dst = marshalTagValue(dst, tag.Key)
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dst = marshalTagValue(dst, tag.Value)
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return dst
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}
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// Unmarshal unmarshals tag from src and returns the remaining data from src.
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func (tag *Tag) Unmarshal(src []byte) ([]byte, error) {
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var err error
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src, tag.Key, err = unmarshalTagValue(tag.Key[:0], src)
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if err != nil {
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return src, fmt.Errorf("cannot unmarshal key: %s", err)
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}
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src, tag.Value, err = unmarshalTagValue(tag.Value[:0], src)
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if err != nil {
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return src, fmt.Errorf("cannot unmarshal value: %s", err)
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}
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return src, nil
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}
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func (tag *Tag) copyFrom(src *Tag) {
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tag.Key = append(tag.Key[:0], src.Key...)
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tag.Value = append(tag.Value[:0], src.Value...)
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}
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func marshalTagValueNoTrailingTagSeparator(dst, src []byte) []byte {
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dst = marshalTagValue(dst, src)
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// Remove trailing tagSeparatorChar
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return dst[:len(dst)-1]
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}
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func marshalTagValue(dst, src []byte) []byte {
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n1 := bytes.IndexByte(src, escapeChar)
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n2 := bytes.IndexByte(src, tagSeparatorChar)
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n3 := bytes.IndexByte(src, kvSeparatorChar)
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if n1 < 0 && n2 < 0 && n3 < 0 {
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// Fast path.
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dst = append(dst, src...)
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dst = append(dst, tagSeparatorChar)
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return dst
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}
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// Slow path.
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for _, ch := range src {
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switch ch {
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case escapeChar:
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dst = append(dst, escapeChar, '0')
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case tagSeparatorChar:
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dst = append(dst, escapeChar, '1')
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case kvSeparatorChar:
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dst = append(dst, escapeChar, '2')
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default:
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dst = append(dst, ch)
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}
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}
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dst = append(dst, tagSeparatorChar)
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return dst
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}
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func unmarshalTagValue(dst, src []byte) ([]byte, []byte, error) {
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n := bytes.IndexByte(src, tagSeparatorChar)
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if n < 0 {
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return src, dst, fmt.Errorf("cannot find the end of tag value")
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}
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b := src[:n]
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src = src[n+1:]
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for {
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n := bytes.IndexByte(b, escapeChar)
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if n < 0 {
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dst = append(dst, b...)
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return src, dst, nil
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}
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dst = append(dst, b[:n]...)
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b = b[n+1:]
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if len(b) == 0 {
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return src, dst, fmt.Errorf("missing escaped char")
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}
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switch b[0] {
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case '0':
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dst = append(dst, escapeChar)
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case '1':
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dst = append(dst, tagSeparatorChar)
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case '2':
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dst = append(dst, kvSeparatorChar)
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default:
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return src, dst, fmt.Errorf("unsupported escaped char: %c", b[0])
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}
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b = b[1:]
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}
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}
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// MetricName reperesents a metric name.
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type MetricName struct {
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MetricGroup []byte
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// Tags are optional. They must be sorted by tag Key for canonical view.
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// Use sortTags method.
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Tags []Tag
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}
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// GetMetricName returns a MetricName from pool.
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func GetMetricName() *MetricName {
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v := mnPool.Get()
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if v == nil {
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return &MetricName{}
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}
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return v.(*MetricName)
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}
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// PutMetricName returns mn to the pool.
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func PutMetricName(mn *MetricName) {
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mn.Reset()
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mnPool.Put(mn)
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}
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var mnPool sync.Pool
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// Reset resets the mn.
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func (mn *MetricName) Reset() {
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mn.MetricGroup = mn.MetricGroup[:0]
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mn.Tags = mn.Tags[:0]
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}
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// CopyFrom copies src to mn.
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func (mn *MetricName) CopyFrom(src *MetricName) {
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if cap(mn.MetricGroup) > 0 {
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mn.MetricGroup = append(mn.MetricGroup[:0], src.MetricGroup...)
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mn.Tags = copyTags(mn.Tags[:0], src.Tags)
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return
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}
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// Pre-allocate a single byte slice for MetricGroup + all the tags.
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// This reduces the number of memory allocations for zero mn.
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size := len(src.MetricGroup)
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for i := range src.Tags {
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tag := &src.Tags[i]
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size += len(tag.Key)
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size += len(tag.Value)
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}
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b := make([]byte, 0, size)
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b = append(b, src.MetricGroup...)
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mn.MetricGroup = b[:len(b):len(b)]
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mn.Tags = make([]Tag, len(src.Tags))
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for i := range src.Tags {
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st := &src.Tags[i]
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dt := &mn.Tags[i]
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b = append(b, st.Key...)
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dt.Key = b[len(b)-len(st.Key) : len(b) : len(b)]
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b = append(b, st.Value...)
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dt.Value = b[len(b)-len(st.Value) : len(b) : len(b)]
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}
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}
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// AddTag adds new tag to mn with the given key and value.
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func (mn *MetricName) AddTag(key, value string) {
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tag := mn.addNextTag()
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tag.Key = append(tag.Key[:0], key...)
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tag.Value = append(tag.Value[:0], value...)
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}
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// AddTagBytes adds new tag to mn with the given key and value.
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func (mn *MetricName) AddTagBytes(key, value []byte) {
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tag := mn.addNextTag()
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tag.Key = append(tag.Key[:0], key...)
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tag.Value = append(tag.Value[:0], value...)
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}
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func (mn *MetricName) addNextTag() *Tag {
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if len(mn.Tags) < cap(mn.Tags) {
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mn.Tags = mn.Tags[:len(mn.Tags)+1]
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} else {
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mn.Tags = append(mn.Tags, Tag{})
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}
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return &mn.Tags[len(mn.Tags)-1]
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}
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// ResetMetricGroup resets mn.MetricGroup
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func (mn *MetricName) ResetMetricGroup() {
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mn.MetricGroup = mn.MetricGroup[:0]
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}
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var metricGroupTagKey = []byte("__name__")
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// RemoveTagsOn removes all the tags not included to onTags.
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func (mn *MetricName) RemoveTagsOn(onTags []string) {
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if !hasTag(onTags, metricGroupTagKey) {
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mn.ResetMetricGroup()
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}
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tags := mn.Tags
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mn.Tags = mn.Tags[:0]
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if len(onTags) == 0 {
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return
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}
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for i := range tags {
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tag := &tags[i]
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if hasTag(onTags, tag.Key) {
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mn.AddTagBytes(tag.Key, tag.Value)
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}
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}
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}
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// RemoveTag removes a tag with the given tagKey
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func (mn *MetricName) RemoveTag(tagKey string) {
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if tagKey == "__name__" {
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mn.ResetMetricGroup()
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return
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}
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tags := mn.Tags
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mn.Tags = mn.Tags[:0]
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for i := range tags {
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tag := &tags[i]
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if string(tag.Key) != tagKey {
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mn.AddTagBytes(tag.Key, tag.Value)
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}
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}
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}
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// RemoveTagsIgnoring removes all the tags included in ignoringTags.
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func (mn *MetricName) RemoveTagsIgnoring(ignoringTags []string) {
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if len(ignoringTags) == 0 {
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return
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}
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if hasTag(ignoringTags, metricGroupTagKey) {
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mn.ResetMetricGroup()
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}
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tags := mn.Tags
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mn.Tags = mn.Tags[:0]
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for i := range tags {
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tag := &tags[i]
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if !hasTag(ignoringTags, tag.Key) {
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mn.AddTagBytes(tag.Key, tag.Value)
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}
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}
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}
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// GetTagValue returns tag value for the given tagKey.
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func (mn *MetricName) GetTagValue(tagKey string) []byte {
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if tagKey == "__name__" {
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return mn.MetricGroup
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}
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tags := mn.Tags
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for i := range tags {
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tag := &tags[i]
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if string(tag.Key) == tagKey {
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return tag.Value
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}
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}
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return nil
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}
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// AddMissingTags adds tags from src with keys matching addTags.
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func (mn *MetricName) AddMissingTags(addTags []string, src *MetricName) {
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if hasTag(addTags, metricGroupTagKey) {
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mn.MetricGroup = append(mn.MetricGroup[:0], src.MetricGroup...)
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}
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for i := range src.Tags {
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srcTag := &src.Tags[i]
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if !hasTag(addTags, srcTag.Key) {
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continue
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}
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found := false
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for j := range mn.Tags {
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tag := &mn.Tags[j]
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if string(tag.Key) == string(srcTag.Key) {
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found = true
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break
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}
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}
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if !found {
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mn.AddTagBytes(srcTag.Key, srcTag.Value)
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}
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}
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}
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func hasTag(tags []string, key []byte) bool {
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for _, t := range tags {
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if t == string(key) {
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return true
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}
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}
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return false
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}
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// String returns user-readable representation of the metric name.
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//
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// Use this function only for debug logging.
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func (mn *MetricName) String() string {
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mn.sortTags()
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var tags []string
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for i := range mn.Tags {
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t := &mn.Tags[i]
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tags = append(tags, fmt.Sprintf("%q=%q", t.Key, t.Value))
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}
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tagsStr := strings.Join(tags, ", ")
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return fmt.Sprintf("MetricGroup=%q, tags=[%s]", mn.MetricGroup, tagsStr)
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}
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// Marshal appends marshaled mn to dst and returns the result.
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//
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// Tags must be sorted before calling this function.
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func (mn *MetricName) Marshal(dst []byte) []byte {
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// Calculate the required size and pre-allocate space in dst
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dstLen := len(dst)
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requiredSize := len(mn.MetricGroup) + 1
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for i := range mn.Tags {
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tag := &mn.Tags[i]
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requiredSize += len(tag.Key) + len(tag.Value) + 2
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}
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dst = bytesutil.Resize(dst, requiredSize)
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dst = dst[:dstLen]
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// Marshal MetricGroup
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dst = marshalTagValue(dst, mn.MetricGroup)
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// Marshal tags.
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dst = marshalTags(dst, mn.Tags)
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return dst
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}
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// Unmarshal unmarshals mn from src.
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func (mn *MetricName) Unmarshal(src []byte) error {
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// Unmarshal MetricGroup.
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var err error
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src, mn.MetricGroup, err = unmarshalTagValue(mn.MetricGroup[:0], src)
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if err != nil {
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return fmt.Errorf("cannot unmarshal MetricGroup: %s", err)
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}
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mn.Tags = mn.Tags[:0]
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for len(src) > 0 {
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tag := mn.addNextTag()
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var err error
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src, err = tag.Unmarshal(src)
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if err != nil {
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return fmt.Errorf("cannot unmarshal tag: %s", err)
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}
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}
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// There is no need in verifying for identical tag keys,
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// since they must be handled in MetricName.Marshal inside marshalTags.
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return nil
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}
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// The maximum length of label name.
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//
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// Longer names are truncated.
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const maxLabelNameLen = 256
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// The maximum length of label value.
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//
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// Longer values are truncated.
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const maxLabelValueLen = 16 * 1024
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// The maximum number of labels per each timeseries.
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var maxLabelsPerTimeseries = 30
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// SetMaxLabelsPerTimeseries sets the limit on the number of labels
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// per each time series.
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//
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// Superfouos labels are dropped.
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func SetMaxLabelsPerTimeseries(maxLabels int) {
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if maxLabels <= 0 {
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logger.Panicf("BUG: maxLabels must be positive; got %d", maxLabels)
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}
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maxLabelsPerTimeseries = maxLabels
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}
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// MarshalMetricNameRaw marshals labels to dst and returns the result.
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//
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// The result must be unmarshaled with MetricName.unmarshalRaw
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func MarshalMetricNameRaw(dst []byte, labels []prompb.Label) []byte {
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// Calculate the required space for dst.
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dstLen := len(dst)
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dstSize := dstLen
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for i := range labels {
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if i >= maxLabelsPerTimeseries {
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break
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}
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label := &labels[i]
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if len(label.Name) > maxLabelNameLen {
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label.Name = label.Name[:maxLabelNameLen]
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}
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if len(label.Value) > maxLabelValueLen {
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label.Value = label.Value[:maxLabelValueLen]
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}
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if len(label.Value) == 0 {
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// Skip labels without values, since they have no sense in prometheus.
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continue
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}
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if string(label.Name) == "__name__" {
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label.Name = label.Name[:0]
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}
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dstSize += len(label.Name)
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dstSize += len(label.Value)
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dstSize += 4
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}
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dst = bytesutil.Resize(dst, dstSize)[:dstLen]
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// Marshal labels to dst.
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for i := range labels {
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if i >= maxLabelsPerTimeseries {
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break
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}
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label := &labels[i]
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if len(label.Value) == 0 {
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// Skip labels without values, since they have no sense in prometheus.
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continue
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}
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dst = marshalBytesFast(dst, label.Name)
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dst = marshalBytesFast(dst, label.Value)
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}
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return dst
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}
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// marshalRaw marshals mn to dst and returns the result.
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//
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// The results may be unmarshaled with MetricName.unmarshalRaw.
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//
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// This function is for testing purposes. MarshalMetricNameRaw must be used
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// in prod instead.
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func (mn *MetricName) marshalRaw(dst []byte) []byte {
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dst = marshalBytesFast(dst, nil)
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dst = marshalBytesFast(dst, mn.MetricGroup)
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mn.sortTags()
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for i := range mn.Tags {
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tag := &mn.Tags[i]
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dst = marshalBytesFast(dst, tag.Key)
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dst = marshalBytesFast(dst, tag.Value)
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}
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return dst
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}
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// unmarshalRaw unmarshals mn encoded with MarshalMetricNameRaw.
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func (mn *MetricName) unmarshalRaw(src []byte) error {
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mn.Reset()
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for len(src) > 0 {
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tail, key, err := unmarshalBytesFast(src)
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if err != nil {
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return fmt.Errorf("cannot decode key: %s", err)
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}
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src = tail
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tail, value, err := unmarshalBytesFast(src)
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if err != nil {
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return fmt.Errorf("cannot decode value: %s", err)
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}
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src = tail
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if len(key) == 0 {
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mn.MetricGroup = append(mn.MetricGroup[:0], value...)
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} else {
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mn.AddTagBytes(key, value)
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}
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}
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return nil
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}
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func marshalBytesFast(dst []byte, s []byte) []byte {
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dst = encoding.MarshalUint16(dst, uint16(len(s)))
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dst = append(dst, s...)
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return dst
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}
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func unmarshalBytesFast(src []byte) ([]byte, []byte, error) {
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if len(src) < 2 {
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return src, nil, fmt.Errorf("cannot decode size form src=%X; it must be at least 2 bytes", src)
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}
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n := encoding.UnmarshalUint16(src)
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src = src[2:]
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if len(src) < int(n) {
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return src, nil, fmt.Errorf("too short src=%X; it must be at least %d bytes", src, n)
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}
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return src[n:], src[:n], nil
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}
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// sortTags sorts tags in mn.
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//
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// Tags sorting is quite slow, so try avoiding it by caching mn
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// with sorted tags.
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func (mn *MetricName) sortTags() {
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if len(mn.Tags) == 0 {
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return
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}
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cts := getCanonicalTags()
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if n := len(mn.Tags) - cap(cts.tags); n > 0 {
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cts.tags = append(cts.tags[:cap(cts.tags)], make([]canonicalTag, n)...)
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}
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dst := cts.tags[:len(mn.Tags)]
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for i := range mn.Tags {
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tag := &mn.Tags[i]
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ct := &dst[i]
|
|
ct.key = normalizeTagKey(tag.Key)
|
|
ct.tag.copyFrom(tag)
|
|
}
|
|
cts.tags = dst
|
|
|
|
// Use sort.Sort instead of sort.Slice, since sort.Slice allocates a lot.
|
|
sort.Sort(&cts.tags)
|
|
|
|
for i := range cts.tags {
|
|
mn.Tags[i].copyFrom(&cts.tags[i].tag)
|
|
}
|
|
|
|
putCanonicalTags(cts)
|
|
}
|
|
|
|
func getCanonicalTags() *canonicalTags {
|
|
v := canonicalTagsPool.Get()
|
|
if v == nil {
|
|
return &canonicalTags{}
|
|
}
|
|
return v.(*canonicalTags)
|
|
}
|
|
|
|
func putCanonicalTags(cts *canonicalTags) {
|
|
cts.tags = cts.tags[:0]
|
|
canonicalTagsPool.Put(cts)
|
|
}
|
|
|
|
var canonicalTagsPool sync.Pool
|
|
|
|
type canonicalTags struct {
|
|
tags canonicalTagsSort
|
|
}
|
|
|
|
type canonicalTag struct {
|
|
key []byte
|
|
tag Tag
|
|
}
|
|
|
|
type canonicalTagsSort []canonicalTag
|
|
|
|
func (ts *canonicalTagsSort) Len() int { return len(*ts) }
|
|
func (ts *canonicalTagsSort) Less(i, j int) bool {
|
|
x := *ts
|
|
return string(x[i].key) < string(x[j].key)
|
|
}
|
|
func (ts *canonicalTagsSort) Swap(i, j int) {
|
|
x := *ts
|
|
x[i], x[j] = x[j], x[i]
|
|
}
|
|
|
|
func marshalTags(dst []byte, tags []Tag) []byte {
|
|
var prevKey []byte
|
|
for i := range tags {
|
|
t := &tags[i]
|
|
if string(prevKey) == string(t.Key) {
|
|
// Skip duplicate keys, since they aren't allowed in Prometheus data model.
|
|
continue
|
|
}
|
|
prevKey = t.Key
|
|
dst = t.Marshal(dst)
|
|
}
|
|
return dst
|
|
}
|
|
|
|
func copyTags(dst, src []Tag) []Tag {
|
|
dstLen := len(dst)
|
|
if n := dstLen + len(src) - cap(dst); n > 0 {
|
|
dst = append(dst[:cap(dst)], make([]Tag, n)...)
|
|
}
|
|
dst = dst[:dstLen+len(src)]
|
|
for i := range src {
|
|
dst[dstLen+i].copyFrom(&src[i])
|
|
}
|
|
return dst
|
|
}
|
|
|
|
var commonTagKeys = func() map[string][]byte {
|
|
lcm := map[string][]byte{
|
|
// job-like tags must go first in MetricName.Tags.
|
|
// This should improve data locality.
|
|
// They start with \x00\x00.
|
|
// Do not change values!
|
|
//
|
|
// TODO: add more job-like tags.
|
|
"namespace": []byte("\x00\x00\x00"),
|
|
"ns": []byte("\x00\x00\x01"),
|
|
"datacenter": []byte("\x00\x00\x08"),
|
|
"dc": []byte("\x00\x00\x09"),
|
|
"environment": []byte("\x00\x00\x0c"),
|
|
"env": []byte("\x00\x00\x0d"),
|
|
"cluster": []byte("\x00\x00\x10"),
|
|
"service": []byte("\x00\x00\x18"),
|
|
"job": []byte("\x00\x00\x20"),
|
|
"model": []byte("\x00\x00\x28"),
|
|
"type": []byte("\x00\x00\x30"),
|
|
"sensor_type": []byte("\x00\x00\x38"),
|
|
"SensorType": []byte("\x00\x00\x38"),
|
|
"db": []byte("\x00\x00\x40"),
|
|
|
|
// instance-like tags must go second in MetricName.Tags.
|
|
// This should improve data locality.
|
|
// They start with \x00\x01.
|
|
// Do not change values!
|
|
//
|
|
// TODO: add more instance-like tags.
|
|
"instance": []byte("\x00\x01\x00"),
|
|
"host": []byte("\x00\x01\x08"),
|
|
"server": []byte("\x00\x01\x10"),
|
|
"pod": []byte("\x00\x01\x18"),
|
|
"node": []byte("\x00\x01\x20"),
|
|
"device": []byte("\x00\x01\x28"),
|
|
"tenant": []byte("\x00\x01\x30"),
|
|
"client": []byte("\x00\x01\x38"),
|
|
"name": []byte("\x00\x01\x40"),
|
|
"measurement": []byte("\x00\x01\x48"),
|
|
}
|
|
|
|
// Generate Upper-case variants of lc
|
|
m := make(map[string][]byte, len(lcm)*2)
|
|
for k, v := range lcm {
|
|
s := strings.ToUpper(k[:1]) + k[1:]
|
|
m[k] = v
|
|
m[s] = v
|
|
}
|
|
return m
|
|
}()
|
|
|
|
func normalizeTagKey(key []byte) []byte {
|
|
tagKey := commonTagKeys[string(key)]
|
|
if tagKey == nil {
|
|
return key
|
|
}
|
|
return tagKey
|
|
}
|