prometheus/storage/fanout_test.go
Tom Wilkie ba418780be Dedupe samples in the mergeIterator.
Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>
2018-05-23 12:15:47 +01:00

280 lines
7.6 KiB
Go

// Copyright 2017 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"fmt"
"testing"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/pkg/labels"
)
func TestMergeStringSlices(t *testing.T) {
for _, tc := range []struct {
input [][]string
expected []string
}{
{},
{[][]string{{"foo"}}, []string{"foo"}},
{[][]string{{"foo"}, {"bar"}}, []string{"bar", "foo"}},
{[][]string{{"foo"}, {"bar"}, {"baz"}}, []string{"bar", "baz", "foo"}},
} {
require.Equal(t, tc.expected, mergeStringSlices(tc.input))
}
}
func TestMergeTwoStringSlices(t *testing.T) {
for _, tc := range []struct {
a, b, expected []string
}{
{[]string{}, []string{}, []string{}},
{[]string{"foo"}, nil, []string{"foo"}},
{nil, []string{"bar"}, []string{"bar"}},
{[]string{"foo"}, []string{"bar"}, []string{"bar", "foo"}},
{[]string{"foo"}, []string{"bar", "baz"}, []string{"bar", "baz", "foo"}},
{[]string{"foo"}, []string{"foo"}, []string{"foo"}},
} {
require.Equal(t, tc.expected, mergeTwoStringSlices(tc.a, tc.b))
}
}
func TestMergeSeriesSet(t *testing.T) {
for _, tc := range []struct {
input []SeriesSet
expected SeriesSet
}{
{
input: []SeriesSet{newMockSeriesSet()},
expected: newMockSeriesSet(),
},
{
input: []SeriesSet{newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}}),
)},
expected: newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}}),
),
},
{
input: []SeriesSet{newMockSeriesSet(
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}}),
), newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}}),
)},
expected: newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}}),
),
},
{
input: []SeriesSet{newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}}),
), newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{3, 3}, {4, 4}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{2, 2}, {3, 3}}),
)},
expected: newMockSeriesSet(
newMockSeries(labels.FromStrings("bar", "baz"), []sample{{1, 1}, {2, 2}, {3, 3}, {4, 4}}),
newMockSeries(labels.FromStrings("foo", "bar"), []sample{{0, 0}, {1, 1}, {2, 2}, {3, 3}}),
),
},
} {
merged := NewMergeSeriesSet(tc.input)
for merged.Next() {
require.True(t, tc.expected.Next())
actualSeries := merged.At()
expectedSeries := tc.expected.At()
require.Equal(t, expectedSeries.Labels(), actualSeries.Labels())
require.Equal(t, drainSamples(expectedSeries.Iterator()), drainSamples(actualSeries.Iterator()))
}
require.False(t, tc.expected.Next())
}
}
func TestMergeIterator(t *testing.T) {
for _, tc := range []struct {
input []SeriesIterator
expected []sample
}{
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {1, 1}}),
},
expected: []sample{{0, 0}, {1, 1}},
},
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {1, 1}}),
newListSeriesIterator([]sample{{2, 2}, {3, 3}}),
},
expected: []sample{{0, 0}, {1, 1}, {2, 2}, {3, 3}},
},
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {3, 3}}),
newListSeriesIterator([]sample{{1, 1}, {4, 4}}),
newListSeriesIterator([]sample{{2, 2}, {5, 5}}),
},
expected: []sample{{0, 0}, {1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}},
},
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {1, 1}}),
newListSeriesIterator([]sample{{0, 0}, {2, 2}}),
newListSeriesIterator([]sample{{2, 2}, {3, 3}}),
},
expected: []sample{{0, 0}, {1, 1}, {2, 2}, {3, 3}},
},
} {
merged := newMergeIterator(tc.input)
actual := drainSamples(merged)
require.Equal(t, tc.expected, actual)
}
}
func TestMergeIteratorSeek(t *testing.T) {
for _, tc := range []struct {
input []SeriesIterator
seek int64
expected []sample
}{
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {1, 1}, {2, 2}}),
},
seek: 1,
expected: []sample{{1, 1}, {2, 2}},
},
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {1, 1}}),
newListSeriesIterator([]sample{{2, 2}, {3, 3}}),
},
seek: 2,
expected: []sample{{2, 2}, {3, 3}},
},
{
input: []SeriesIterator{
newListSeriesIterator([]sample{{0, 0}, {3, 3}}),
newListSeriesIterator([]sample{{1, 1}, {4, 4}}),
newListSeriesIterator([]sample{{2, 2}, {5, 5}}),
},
seek: 2,
expected: []sample{{2, 2}, {3, 3}, {4, 4}, {5, 5}},
},
} {
merged := newMergeIterator(tc.input)
actual := []sample{}
if merged.Seek(tc.seek) {
t, v := merged.At()
actual = append(actual, sample{t, v})
}
actual = append(actual, drainSamples(merged)...)
require.Equal(t, tc.expected, actual)
}
}
func drainSamples(iter SeriesIterator) []sample {
result := []sample{}
for iter.Next() {
t, v := iter.At()
result = append(result, sample{t, v})
}
return result
}
type mockSeriesSet struct {
idx int
series []Series
}
func newMockSeriesSet(series ...Series) SeriesSet {
return &mockSeriesSet{
idx: -1,
series: series,
}
}
func (m *mockSeriesSet) Next() bool {
m.idx++
return m.idx < len(m.series)
}
func (m *mockSeriesSet) At() Series {
return m.series[m.idx]
}
func (m *mockSeriesSet) Err() error {
return nil
}
var result []sample
func makeSeriesSet(numSeries, numSamples int) SeriesSet {
series := []Series{}
for j := 0; j < numSeries; j++ {
labels := labels.Labels{{Name: "foo", Value: fmt.Sprintf("bar%d", j)}}
samples := []sample{}
for k := 0; k < numSamples; k++ {
samples = append(samples, sample{t: int64(k), v: float64(k)})
}
series = append(series, newMockSeries(labels, samples))
}
return newMockSeriesSet(series...)
}
func makeMergeSeriesSet(numSeriesSets, numSeries, numSamples int) SeriesSet {
seriesSets := []SeriesSet{}
for i := 0; i < numSeriesSets; i++ {
seriesSets = append(seriesSets, makeSeriesSet(numSeries, numSamples))
}
return NewMergeSeriesSet(seriesSets)
}
func benchmarkDrain(seriesSet SeriesSet, b *testing.B) {
for n := 0; n < b.N; n++ {
for seriesSet.Next() {
result = drainSamples(seriesSet.At().Iterator())
}
}
}
func BenchmarkNoMergeSeriesSet_100_100(b *testing.B) {
seriesSet := makeSeriesSet(100, 100)
benchmarkDrain(seriesSet, b)
}
func BenchmarkMergeSeriesSet(b *testing.B) {
for _, bm := range []struct {
numSeriesSets, numSeries, numSamples int
}{
{1, 100, 100},
{10, 100, 100},
{100, 100, 100},
} {
seriesSet := makeMergeSeriesSet(bm.numSeriesSets, bm.numSeries, bm.numSamples)
b.Run(fmt.Sprintf("%d_%d_%d", bm.numSeriesSets, bm.numSeries, bm.numSamples), func(b *testing.B) {
benchmarkDrain(seriesSet, b)
})
}
}