From 63c16c3fdf573bace4530a2b12987efb5b7287a4 Mon Sep 17 00:00:00 2001 From: Aliaksandr Valialkin Date: Mon, 22 Feb 2021 00:50:57 +0200 Subject: [PATCH] lib/promrelabel: optimize relabeling performance for common cases --- docs/CHANGELOG.md | 1 + lib/promrelabel/relabel.go | 88 +++++++++-- lib/promrelabel/relabel_test.go | 181 ++++++++++++++++++++++- lib/promrelabel/relabel_timing_test.go | 197 ++++++++++++++++++++++++- 4 files changed, 446 insertions(+), 21 deletions(-) diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md index 6ca294ee4..cb42435f6 100644 --- a/docs/CHANGELOG.md +++ b/docs/CHANGELOG.md @@ -11,6 +11,7 @@ * `process_io_storage_read_bytes_total` - the number of bytes read from storage layer * `process_io_storage_written_bytes_total` - the number of bytes written to storage layer * FEATURE: vmagent: export `vm_promscrape_target_relabel_duration_seconds` metric, which can be used for monitoring the time spend on relabeling for discovered targets. +* FEATURE: vmagent: optimize [relabeling](https://victoriametrics.github.io/vmagent.html#relabeling) performance for common cases. * BUGFIX: vmagent: properly perform graceful shutdown on `SIGINT` and `SIGTERM` signals. The graceful shutdown has been broken in `v1.54.0`. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1065 diff --git a/lib/promrelabel/relabel.go b/lib/promrelabel/relabel.go index 0a7a02646..95cd0d924 100644 --- a/lib/promrelabel/relabel.go +++ b/lib/promrelabel/relabel.go @@ -115,12 +115,23 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "replace": bb := relabelBufPool.Get() bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator) - if len(bb.B) == 0 && prc.Regex == defaultRegexForRelabelConfig && !prc.hasCaptureGroupInReplacement && !prc.hasCaptureGroupInTargetLabel { - // Fast path for the following rule that just sets label value: - // - target_label: foobar - // replacement: something-here - relabelBufPool.Put(bb) - return setLabelValue(labels, labelsOffset, prc.TargetLabel, prc.Replacement) + if prc.Regex == defaultRegexForRelabelConfig && !prc.hasCaptureGroupInTargetLabel { + if prc.Replacement == "$1" { + // Fast path for the rule that copies source label values to destination: + // - source_labels: [...] + // target_label: foobar + valueStr := string(bb.B) + relabelBufPool.Put(bb) + return setLabelValue(labels, labelsOffset, prc.TargetLabel, valueStr) + } + if !prc.hasCaptureGroupInReplacement { + // Fast path for the rule that sets label value: + // - target_label: foobar + // replacement: something-here + relabelBufPool.Put(bb) + labels = setLabelValue(labels, labelsOffset, prc.TargetLabel, prc.Replacement) + return labels + } } match := prc.Regex.FindSubmatchIndex(bb.B) if match == nil { @@ -139,6 +150,13 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "replace_all": bb := relabelBufPool.Get() bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator) + if prefix, complete := prc.Regex.LiteralPrefix(); complete && !prc.hasCaptureGroupInReplacement { + // Fast path - string replacement without regexp. + sourceStr := string(bb.B) + relabelBufPool.Put(bb) + valueStr := strings.ReplaceAll(sourceStr, prefix, prc.Replacement) + return setLabelValue(labels, labelsOffset, prc.TargetLabel, valueStr) + } if !prc.Regex.Match(bb.B) { // Fast path - nothing to replace. relabelBufPool.Put(bb) @@ -175,7 +193,14 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "keep": bb := relabelBufPool.Get() bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator) - keep := prc.Regex.Match(bb.B) + keep := false + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + // Fast path - simple string match + keep = prefix == string(bb.B) + } else { + // Slow path - match by regexp + keep = prc.Regex.Match(bb.B) + } relabelBufPool.Put(bb) if !keep { return labels[:labelsOffset] @@ -184,7 +209,14 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "drop": bb := relabelBufPool.Get() bb.B = concatLabelValues(bb.B[:0], src, prc.SourceLabels, prc.Separator) - drop := prc.Regex.Match(bb.B) + drop := false + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + // Fast path - simple string match + drop = prefix == string(bb.B) + } else { + // Slow path - match by regexp + drop = prc.Regex.Match(bb.B) + } relabelBufPool.Put(bb) if drop { return labels[:labelsOffset] @@ -214,16 +246,28 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "labelmap_all": for i := range src { label := &src[i] - if !prc.Regex.MatchString(label.Name) { - continue + if prefix, complete := prc.Regex.LiteralPrefix(); complete && !prc.hasCaptureGroupInReplacement { + // Fast path - replace without regexp + label.Name = strings.ReplaceAll(label.Name, prefix, prc.Replacement) + } else { + // Slow path - replace with regexp. + if !prc.Regex.MatchString(label.Name) { + continue + } + label.Name = prc.Regex.ReplaceAllString(label.Name, prc.Replacement) } - label.Name = prc.Regex.ReplaceAllString(label.Name, prc.Replacement) } return labels case "labeldrop": keepSrc := true for i := range src { - if prc.Regex.MatchString(src[i].Name) { + label := &src[i] + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + if prefix == label.Name { + keepSrc = false + break + } + } else if prc.Regex.MatchString(label.Name) { keepSrc = false break } @@ -234,7 +278,11 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par dst := labels[:labelsOffset] for i := range src { label := &src[i] - if !prc.Regex.MatchString(label.Name) { + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + if prefix != label.Name { + dst = append(dst, *label) + } + } else if !prc.Regex.MatchString(label.Name) { dst = append(dst, *label) } } @@ -242,7 +290,13 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par case "labelkeep": keepSrc := true for i := range src { - if !prc.Regex.MatchString(src[i].Name) { + label := &src[i] + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + if prefix != label.Name { + keepSrc = false + break + } + } else if !prc.Regex.MatchString(src[i].Name) { keepSrc = false break } @@ -253,7 +307,11 @@ func applyRelabelConfig(labels []prompbmarshal.Label, labelsOffset int, prc *Par dst := labels[:labelsOffset] for i := range src { label := &src[i] - if prc.Regex.MatchString(label.Name) { + if prefix, complete := prc.Regex.LiteralPrefix(); complete { + if prefix == label.Name { + dst = append(dst, *label) + } + } else if prc.Regex.MatchString(label.Name) { dst = append(dst, *label) } } diff --git a/lib/promrelabel/relabel_test.go b/lib/promrelabel/relabel_test.go index a57e8bee6..6185f029b 100644 --- a/lib/promrelabel/relabel_test.go +++ b/lib/promrelabel/relabel_test.go @@ -232,6 +232,28 @@ func TestApplyRelabelConfigs(t *testing.T) { }) }) t.Run("replace_all-hit", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "replace_all", + SourceLabels: []string{"xxx"}, + Separator: ";", + TargetLabel: "xxx", + Regex: regexp.MustCompile("-"), + Replacement: ".", + }, + }, []prompbmarshal.Label{ + { + Name: "xxx", + Value: "a-b-c", + }, + }, false, []prompbmarshal.Label{ + { + Name: "xxx", + Value: "a.b.c", + }, + }) + }) + t.Run("replace_all-regex-hit", func(t *testing.T) { f([]ParsedRelabelConfig{ { Action: "replace_all", @@ -265,11 +287,12 @@ func TestApplyRelabelConfigs(t *testing.T) { hasCaptureGroupInReplacement: true, }, { - Action: "replace", - SourceLabels: []string{"bar"}, - TargetLabel: "zar", - Regex: defaultRegexForRelabelConfig, - Replacement: "b-$1", + Action: "replace", + SourceLabels: []string{"bar"}, + TargetLabel: "zar", + Regex: defaultRegexForRelabelConfig, + Replacement: "b-$1", + hasCaptureGroupInReplacement: true, }, }, []prompbmarshal.Label{ { @@ -444,6 +467,25 @@ func TestApplyRelabelConfigs(t *testing.T) { }, true, []prompbmarshal.Label{}) }) t.Run("keep-hit", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "keep", + SourceLabels: []string{"foo"}, + Regex: regexp.MustCompile("yyy"), + }, + }, []prompbmarshal.Label{ + { + Name: "foo", + Value: "yyy", + }, + }, false, []prompbmarshal.Label{ + { + Name: "foo", + Value: "yyy", + }, + }) + }) + t.Run("keep-hit-regexp", func(t *testing.T) { f([]ParsedRelabelConfig{ { Action: "keep", @@ -489,6 +531,20 @@ func TestApplyRelabelConfigs(t *testing.T) { }) }) t.Run("drop-hit", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "drop", + SourceLabels: []string{"foo"}, + Regex: regexp.MustCompile("yyy"), + }, + }, []prompbmarshal.Label{ + { + Name: "foo", + Value: "yyy", + }, + }, true, []prompbmarshal.Label{}) + }) + t.Run("drop-hit-regexp", func(t *testing.T) { f([]ParsedRelabelConfig{ { Action: "drop", @@ -608,7 +664,80 @@ func TestApplyRelabelConfigs(t *testing.T) { }, }) }) + t.Run("labelmap_all-regexp", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "labelmap_all", + Regex: regexp.MustCompile(`ba(.)`), + Replacement: "${1}ss", + }, + }, []prompbmarshal.Label{ + { + Name: "foo.bar.baz", + Value: "yyy", + }, + { + Name: "foozar", + Value: "aaa", + }, + }, true, []prompbmarshal.Label{ + { + Name: "foo.rss.zss", + Value: "yyy", + }, + { + Name: "foozar", + Value: "aaa", + }, + }) + }) t.Run("labeldrop", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "labeldrop", + Regex: regexp.MustCompile("dropme"), + }, + }, []prompbmarshal.Label{ + { + Name: "aaa", + Value: "bbb", + }, + }, true, []prompbmarshal.Label{ + { + Name: "aaa", + Value: "bbb", + }, + }) + f([]ParsedRelabelConfig{ + { + Action: "labeldrop", + Regex: regexp.MustCompile("dropme"), + }, + }, []prompbmarshal.Label{ + { + Name: "xxx", + Value: "yyy", + }, + { + Name: "dropme", + Value: "aaa", + }, + { + Name: "foo", + Value: "bar", + }, + }, false, []prompbmarshal.Label{ + { + Name: "foo", + Value: "bar", + }, + { + Name: "xxx", + Value: "yyy", + }, + }) + }) + t.Run("labeldrop-regexp", func(t *testing.T) { f([]ParsedRelabelConfig{ { Action: "labeldrop", @@ -655,6 +784,48 @@ func TestApplyRelabelConfigs(t *testing.T) { }) }) t.Run("labelkeep", func(t *testing.T) { + f([]ParsedRelabelConfig{ + { + Action: "labelkeep", + Regex: regexp.MustCompile("keepme"), + }, + }, []prompbmarshal.Label{ + { + Name: "keepme", + Value: "aaa", + }, + }, true, []prompbmarshal.Label{ + { + Name: "keepme", + Value: "aaa", + }, + }) + f([]ParsedRelabelConfig{ + { + Action: "labelkeep", + Regex: regexp.MustCompile("keepme"), + }, + }, []prompbmarshal.Label{ + { + Name: "keepme", + Value: "aaa", + }, + { + Name: "aaaa", + Value: "awef", + }, + { + Name: "keepme-aaa", + Value: "234", + }, + }, false, []prompbmarshal.Label{ + { + Name: "keepme", + Value: "aaa", + }, + }) + }) + t.Run("labelkeep-regexp", func(t *testing.T) { f([]ParsedRelabelConfig{ { Action: "labelkeep", diff --git a/lib/promrelabel/relabel_timing_test.go b/lib/promrelabel/relabel_timing_test.go index c16a3a113..fb0a0207c 100644 --- a/lib/promrelabel/relabel_timing_test.go +++ b/lib/promrelabel/relabel_timing_test.go @@ -183,7 +183,7 @@ func BenchmarkApplyRelabelConfigs(b *testing.B) { } }) }) - b.Run("replace-match", func(b *testing.B) { + b.Run("replace-match-regex", func(b *testing.B) { prcs := []ParsedRelabelConfig{ { Action: "replace", @@ -272,6 +272,37 @@ func BenchmarkApplyRelabelConfigs(b *testing.B) { }) }) b.Run("drop-match", func(b *testing.B) { + prcs := []ParsedRelabelConfig{ + { + Action: "drop", + SourceLabels: []string{"id"}, + Regex: regexp.MustCompile("yes"), + }, + } + labelsOrig := []prompbmarshal.Label{ + { + Name: "__name__", + Value: "metric", + }, + { + Name: "id", + Value: "yes", + }, + } + b.ReportAllocs() + b.SetBytes(1) + b.RunParallel(func(pb *testing.PB) { + var labels []prompbmarshal.Label + for pb.Next() { + labels = append(labels[:0], labelsOrig...) + labels = ApplyRelabelConfigs(labels, 0, prcs, true) + if len(labels) != 0 { + panic(fmt.Errorf("unexpected number of labels; got %d; want %d; labels:\n%#v", len(labels), 0, labels)) + } + } + }) + }) + b.Run("drop-match-regexp", func(b *testing.B) { prcs := []ParsedRelabelConfig{ { Action: "drop", @@ -334,6 +365,49 @@ func BenchmarkApplyRelabelConfigs(b *testing.B) { }) }) b.Run("keep-match", func(b *testing.B) { + prcs := []ParsedRelabelConfig{ + { + Action: "keep", + SourceLabels: []string{"id"}, + Regex: regexp.MustCompile("yes"), + }, + } + labelsOrig := []prompbmarshal.Label{ + { + Name: "__name__", + Value: "metric", + }, + { + Name: "id", + Value: "yes", + }, + } + b.ReportAllocs() + b.SetBytes(1) + b.RunParallel(func(pb *testing.PB) { + var labels []prompbmarshal.Label + for pb.Next() { + labels = append(labels[:0], labelsOrig...) + labels = ApplyRelabelConfigs(labels, 0, prcs, true) + if len(labels) != len(labelsOrig) { + panic(fmt.Errorf("unexpected number of labels; got %d; want %d; labels:\n%#v", len(labels), len(labelsOrig), labels)) + } + if labels[0].Name != "__name__" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[0].Name, "__name__")) + } + if labels[0].Value != "metric" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[0].Value, "metric")) + } + if labels[1].Name != "id" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[1].Name, "id")) + } + if labels[1].Value != "yes" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[1].Value, "yes")) + } + } + }) + }) + b.Run("keep-match-regexp", func(b *testing.B) { prcs := []ParsedRelabelConfig{ { Action: "keep", @@ -454,6 +528,42 @@ func BenchmarkApplyRelabelConfigs(b *testing.B) { } }) }) + b.Run("labeldrop-match-regexp", func(b *testing.B) { + prcs := []ParsedRelabelConfig{ + { + Action: "labeldrop", + Regex: regexp.MustCompile("id.*"), + }, + } + labelsOrig := []prompbmarshal.Label{ + { + Name: "__name__", + Value: "metric", + }, + { + Name: "id", + Value: "foobar-random-string-here", + }, + } + b.ReportAllocs() + b.SetBytes(1) + b.RunParallel(func(pb *testing.PB) { + var labels []prompbmarshal.Label + for pb.Next() { + labels = append(labels[:0], labelsOrig...) + labels = ApplyRelabelConfigs(labels, 0, prcs, true) + if len(labels) != 1 { + panic(fmt.Errorf("unexpected number of labels; got %d; want %d; labels:\n%#v", len(labels), 1, labels)) + } + if labels[0].Name != "__name__" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[0].Name, "__name__")) + } + if labels[0].Value != "metric" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[0].Value, "metric")) + } + } + }) + }) b.Run("labelkeep-mismatch", func(b *testing.B) { prcs := []ParsedRelabelConfig{ { @@ -520,6 +630,91 @@ func BenchmarkApplyRelabelConfigs(b *testing.B) { } }) }) + b.Run("labelkeep-match-regexp", func(b *testing.B) { + prcs := []ParsedRelabelConfig{ + { + Action: "labelkeep", + Regex: regexp.MustCompile("id.*"), + }, + } + labelsOrig := []prompbmarshal.Label{ + { + Name: "__name__", + Value: "metric", + }, + { + Name: "id", + Value: "foobar-random-string-here", + }, + } + b.ReportAllocs() + b.SetBytes(1) + b.RunParallel(func(pb *testing.PB) { + var labels []prompbmarshal.Label + for pb.Next() { + labels = append(labels[:0], labelsOrig...) + labels = ApplyRelabelConfigs(labels, 0, prcs, true) + if len(labels) != 1 { + panic(fmt.Errorf("unexpected number of labels; got %d; want %d; labels:\n%#v", len(labels), 1, labels)) + } + if labels[0].Name != "id" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[0].Name, "id")) + } + if labels[0].Value != "foobar-random-string-here" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[0].Value, "foobar-random-string-here")) + } + } + }) + }) + b.Run("labelmap", func(b *testing.B) { + prcs := []ParsedRelabelConfig{ + { + Action: "labelmap", + Regex: regexp.MustCompile("a(.*)"), + Replacement: "$1", + }, + } + labelsOrig := []prompbmarshal.Label{ + { + Name: "aabc", + Value: "foobar-random-string-here", + }, + { + Name: "foo", + Value: "bar", + }, + } + b.ReportAllocs() + b.SetBytes(1) + b.RunParallel(func(pb *testing.PB) { + var labels []prompbmarshal.Label + for pb.Next() { + labels = append(labels[:0], labelsOrig...) + labels = ApplyRelabelConfigs(labels, 0, prcs, true) + if len(labels) != 3 { + panic(fmt.Errorf("unexpected number of labels; got %d; want %d; labels:\n%#v", len(labels), 3, labels)) + } + if labels[0].Name != "aabc" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[0].Name, "aabc")) + } + if labels[0].Value != "foobar-random-string-here" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[0].Value, "foobar-random-string-here")) + } + if labels[1].Name != "abc" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[1].Name, "abc")) + } + if labels[1].Value != "foobar-random-string-here" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[1].Value, "foobar-random-string-here")) + } + if labels[2].Name != "foo" { + panic(fmt.Errorf("unexpected label name; got %q; want %q", labels[2].Name, "foo")) + } + if labels[2].Value != "bar" { + panic(fmt.Errorf("unexpected label value; got %q; want %q", labels[2].Value, "bar")) + } + } + }) + }) b.Run("hashmod", func(b *testing.B) { prcs := []ParsedRelabelConfig{ {