prometheus/postings_test.go

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// 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.
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package tsdb
import (
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"encoding/binary"
"math/rand"
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"testing"
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"github.com/stretchr/testify/require"
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)
type mockPostings struct {
next func() bool
seek func(uint32) bool
value func() uint32
err func() error
}
func (m *mockPostings) Next() bool { return m.next() }
func (m *mockPostings) Seek(v uint32) bool { return m.seek(v) }
func (m *mockPostings) Value() uint32 { return m.value() }
func (m *mockPostings) Err() error { return m.err() }
func expandPostings(p Postings) (res []uint32, err error) {
for p.Next() {
res = append(res, p.At())
}
return res, p.Err()
}
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func TestIntersect(t *testing.T) {
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var cases = []struct {
a, b []uint32
res []uint32
}{
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{6, 7, 8, 9, 10},
res: nil,
},
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{4, 5, 6, 7, 8},
res: []uint32{4, 5},
},
{
a: []uint32{1, 2, 3, 4, 9, 10},
b: []uint32{1, 4, 5, 6, 7, 8, 10, 11},
res: []uint32{1, 4, 10},
}, {
a: []uint32{1},
b: []uint32{0, 1},
res: []uint32{1},
},
}
for _, c := range cases {
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a := newListPostings(c.a)
b := newListPostings(c.b)
res, err := expandPostings(Intersect(a, b))
require.NoError(t, err)
require.Equal(t, c.res, res)
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}
}
func TestMultiIntersect(t *testing.T) {
var cases = []struct {
p [][]uint32
res []uint32
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}{
{
p: [][]uint32{
{1, 2, 3, 4, 5, 6, 1000, 1001},
{2, 4, 5, 6, 7, 8, 999, 1001},
{1, 2, 5, 6, 7, 8, 1001, 1200},
},
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res: []uint32{2, 5, 6, 1001},
},
// One of the reproduceable cases for:
// https://github.com/prometheus/prometheus/issues/2616
// The initialisation of intersectPostings was moving the iterator forward
// prematurely making us miss some postings.
{
p: [][]uint32{
{1, 2},
{1, 2},
{1, 2},
{2},
},
res: []uint32{2},
},
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}
for _, c := range cases {
ps := make([]Postings, 0, len(c.p))
for _, postings := range c.p {
ps = append(ps, newListPostings(postings))
}
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res, err := expandPostings(Intersect(ps...))
require.NoError(t, err)
require.Equal(t, c.res, res)
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}
}
func BenchmarkIntersect(t *testing.B) {
var a, b, c, d []uint32
for i := 0; i < 10000000; i += 2 {
a = append(a, uint32(i))
}
for i := 5000000; i < 5000100; i += 4 {
b = append(b, uint32(i))
}
for i := 5090000; i < 5090600; i += 4 {
b = append(b, uint32(i))
}
for i := 4990000; i < 5100000; i++ {
c = append(c, uint32(i))
}
for i := 4000000; i < 6000000; i++ {
d = append(d, uint32(i))
}
i1 := newListPostings(a)
i2 := newListPostings(b)
i3 := newListPostings(c)
i4 := newListPostings(d)
t.ResetTimer()
for i := 0; i < t.N; i++ {
if _, err := expandPostings(Intersect(i1, i2, i3, i4)); err != nil {
t.Fatal(err)
}
}
}
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func TestMultiMerge(t *testing.T) {
var cases = []struct {
a, b, c []uint32
res []uint32
}{
{
a: []uint32{1, 2, 3, 4, 5, 6, 1000, 1001},
b: []uint32{2, 4, 5, 6, 7, 8, 999, 1001},
c: []uint32{1, 2, 5, 6, 7, 8, 1001, 1200},
res: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 999, 1000, 1001, 1200},
},
}
for _, c := range cases {
i1 := newListPostings(c.a)
i2 := newListPostings(c.b)
i3 := newListPostings(c.c)
res, err := expandPostings(Merge(i1, i2, i3))
require.NoError(t, err)
require.Equal(t, c.res, res)
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}
}
func TestMergedPostings(t *testing.T) {
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var cases = []struct {
a, b []uint32
res []uint32
}{
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{6, 7, 8, 9, 10},
res: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
},
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{4, 5, 6, 7, 8},
res: []uint32{1, 2, 3, 4, 5, 6, 7, 8},
},
{
a: []uint32{1, 2, 3, 4, 9, 10},
b: []uint32{1, 4, 5, 6, 7, 8, 10, 11},
res: []uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11},
},
}
for _, c := range cases {
a := newListPostings(c.a)
b := newListPostings(c.b)
res, err := expandPostings(newMergedPostings(a, b))
require.NoError(t, err)
require.Equal(t, c.res, res)
}
}
func TestMergedPostingsSeek(t *testing.T) {
var cases = []struct {
a, b []uint32
seek uint32
success bool
res []uint32
}{
{
a: []uint32{2, 3, 4, 5},
b: []uint32{6, 7, 8, 9, 10},
seek: 1,
success: true,
res: []uint32{2, 3, 4, 5, 6, 7, 8, 9, 10},
},
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{6, 7, 8, 9, 10},
seek: 2,
success: true,
res: []uint32{2, 3, 4, 5, 6, 7, 8, 9, 10},
},
{
a: []uint32{1, 2, 3, 4, 5},
b: []uint32{4, 5, 6, 7, 8},
seek: 9,
success: false,
res: nil,
},
{
a: []uint32{1, 2, 3, 4, 9, 10},
b: []uint32{1, 4, 5, 6, 7, 8, 10, 11},
seek: 10,
success: true,
res: []uint32{10, 11},
},
}
for _, c := range cases {
a := newListPostings(c.a)
b := newListPostings(c.b)
p := newMergedPostings(a, b)
require.Equal(t, c.success, p.Seek(c.seek))
// After Seek(), At() should be called.
if c.success {
start := p.At()
lst, err := expandPostings(p)
require.NoError(t, err)
lst = append([]uint32{start}, lst...)
require.Equal(t, c.res, lst)
}
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}
return
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}
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func TestBigEndian(t *testing.T) {
num := 1000
// mock a list as postings
ls := make([]uint32, num)
ls[0] = 2
for i := 1; i < num; i++ {
ls[i] = ls[i-1] + uint32(rand.Int31n(25)) + 2
}
beLst := make([]byte, num*4)
for i := 0; i < num; i++ {
b := beLst[i*4 : i*4+4]
binary.BigEndian.PutUint32(b, ls[i])
}
t.Run("Iteration", func(t *testing.T) {
bep := newBigEndianPostings(beLst)
for i := 0; i < num; i++ {
require.True(t, bep.Next())
require.Equal(t, ls[i], bep.At())
}
require.False(t, bep.Next())
require.Nil(t, bep.Err())
})
t.Run("Seek", func(t *testing.T) {
table := []struct {
seek uint32
val uint32
found bool
}{
{
ls[0] - 1, ls[0], true,
},
{
ls[4], ls[4], true,
},
{
ls[500] - 1, ls[500], true,
},
{
ls[600] + 1, ls[601], true,
},
{
ls[600] + 1, ls[601], true,
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},
{
ls[600] + 1, ls[601], true,
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},
{
ls[0], ls[601], true,
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},
{
ls[600], ls[601], true,
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},
{
ls[999], ls[999], true,
},
{
ls[999] + 10, ls[999], false,
},
}
bep := newBigEndianPostings(beLst)
for _, v := range table {
require.Equal(t, v.found, bep.Seek(v.seek))
require.Equal(t, v.val, bep.At())
require.Nil(t, bep.Err())
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}
})
}
func TestIntersectWithMerge(t *testing.T) {
// One of the reproduceable cases for:
// https://github.com/prometheus/prometheus/issues/2616
a := newListPostings([]uint32{21, 22, 23, 24, 25, 30})
b := newMergedPostings(
newListPostings([]uint32{10, 20, 30}),
newListPostings([]uint32{15, 26, 30}),
)
p := Intersect(a, b)
res, err := expandPostings(p)
require.NoError(t, err)
require.Equal(t, []uint32{30}, res)
}