prometheus/index_test.go

357 lines
8.2 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 tsdb
import (
"io/ioutil"
"math/rand"
"os"
"path/filepath"
"sort"
"testing"
"github.com/pkg/errors"
"github.com/prometheus/tsdb/chunks"
"github.com/prometheus/tsdb/labels"
"github.com/stretchr/testify/require"
)
type series struct {
l labels.Labels
chunks []*ChunkMeta
}
type mockIndex struct {
series map[uint32]series
labelIndex map[string][]string
postings map[labels.Label]Postings
}
func newMockIndex() mockIndex {
return mockIndex{
series: make(map[uint32]series),
labelIndex: make(map[string][]string),
postings: make(map[labels.Label]Postings),
}
}
func (m mockIndex) AddSeries(ref uint32, l labels.Labels, chunks ...*ChunkMeta) error {
if _, ok := m.series[ref]; ok {
return errors.Errorf("series with reference %d already added", ref)
}
s := series{l: l}
// Actual chunk data is not stored in the index.
for _, c := range chunks {
cc := *c
cc.Chunk = nil
s.chunks = append(s.chunks, &cc)
}
m.series[ref] = s
return nil
}
func (m mockIndex) WriteLabelIndex(names []string, values []string) error {
// TODO support composite indexes
if len(names) != 1 {
return errors.New("composite indexes not supported yet")
}
sort.Strings(values)
m.labelIndex[names[0]] = values
return nil
}
func (m mockIndex) WritePostings(name, value string, it Postings) error {
lbl := labels.Label{
Name: name,
Value: value,
}
type refdSeries struct {
ref uint32
series series
}
// Re-Order so that the list is ordered by labels of the series.
// Internally that is how the series are laid out.
refs := make([]refdSeries, 0)
for it.Next() {
s, ok := m.series[it.At()]
if !ok {
return errors.Errorf("series for reference %d not found", it.At())
}
refs = append(refs, refdSeries{it.At(), s})
}
if err := it.Err(); err != nil {
return err
}
sort.Slice(refs, func(i, j int) bool {
return labels.Compare(refs[i].series.l, refs[j].series.l) < 0
})
postings := make([]uint32, 0, len(refs))
for _, r := range refs {
postings = append(postings, r.ref)
}
m.postings[lbl] = newListPostings(postings)
return nil
}
func (m mockIndex) Close() error {
return nil
}
func (m mockIndex) LabelValues(names ...string) (StringTuples, error) {
// TODO support composite indexes
if len(names) != 1 {
return nil, errors.New("composite indexes not supported yet")
}
return newStringTuples(m.labelIndex[names[0]], 1)
}
func (m mockIndex) Postings(name, value string) (Postings, error) {
lbl := labels.Label{
Name: name,
Value: value,
}
p, ok := m.postings[lbl]
if !ok {
return nil, ErrNotFound
}
return p, nil
}
func (m mockIndex) Series(ref uint32) (labels.Labels, []*ChunkMeta, error) {
s, ok := m.series[ref]
if !ok {
return nil, nil, ErrNotFound
}
return s.l, s.chunks, nil
}
func (m mockIndex) LabelIndices() ([][]string, error) {
res := make([][]string, 0, len(m.labelIndex))
for k := range m.labelIndex {
res = append(res, []string{k})
}
return res, nil
}
func TestIndexRW_Create_Open(t *testing.T) {
dir, err := ioutil.TempDir("", "test_index_create")
require.NoError(t, err)
defer os.RemoveAll(dir)
// An empty index must still result in a readable file.
iw, err := newIndexWriter(dir)
require.NoError(t, err, "create index writer")
require.NoError(t, iw.Close(), "close index writer")
ir, err := newIndexReader(dir)
require.NoError(t, err, "open index reader")
require.NoError(t, ir.Close(), "close index reader")
// Modify magic header must cause open to fail.
f, err := os.OpenFile(filepath.Join(dir, "index"), os.O_WRONLY, 0666)
require.NoError(t, err)
_, err = f.WriteAt([]byte{0, 0}, 0)
require.NoError(t, err)
_, err = newIndexReader(dir)
require.Error(t, err)
}
func TestIndexRW_Postings(t *testing.T) {
dir, err := ioutil.TempDir("", "test_index_postings")
require.NoError(t, err)
defer os.RemoveAll(dir)
iw, err := newIndexWriter(dir)
require.NoError(t, err, "create index writer")
series := []labels.Labels{
labels.FromStrings("a", "1", "b", "1"),
labels.FromStrings("a", "1", "b", "2"),
labels.FromStrings("a", "1", "b", "3"),
labels.FromStrings("a", "1", "b", "4"),
}
// Postings lists are only written if a series with the respective
// reference was added before.
require.NoError(t, iw.AddSeries(1, series[0]))
require.NoError(t, iw.AddSeries(3, series[2]))
require.NoError(t, iw.AddSeries(2, series[1]))
require.NoError(t, iw.AddSeries(4, series[3]))
err = iw.WritePostings("a", "1", newListPostings([]uint32{1, 2, 3, 4}))
require.NoError(t, err)
require.NoError(t, iw.Close())
ir, err := newIndexReader(dir)
require.NoError(t, err, "open index reader")
p, err := ir.Postings("a", "1")
require.NoError(t, err)
for i := 0; p.Next(); i++ {
l, c, err := ir.Series(p.At())
require.NoError(t, err)
require.Equal(t, 0, len(c))
require.Equal(t, l, series[i])
}
require.NoError(t, p.Err())
require.NoError(t, ir.Close())
}
func TestPersistence_index_e2e(t *testing.T) {
dir, err := ioutil.TempDir("", "test_persistence_e2e")
require.NoError(t, err)
defer os.RemoveAll(dir)
lbls, err := readPrometheusLabels("testdata/20k.series", 20000)
require.NoError(t, err)
var input indexWriterSeriesSlice
// Generate ChunkMetas for every label set.
for i, lset := range lbls {
var metas []*ChunkMeta
for j := 0; j <= (i % 20); j++ {
metas = append(metas, &ChunkMeta{
MinTime: int64(j * 10000),
MaxTime: int64((j + 1) * 10000),
Ref: rand.Uint64(),
Chunk: chunks.NewXORChunk(),
})
}
input = append(input, &indexWriterSeries{
labels: lset,
chunks: metas,
})
}
iw, err := newIndexWriter(dir)
require.NoError(t, err)
// Population procedure as done by compaction.
var (
postings = &memPostings{m: make(map[term][]uint32, 512)}
values = map[string]stringset{}
)
mi := newMockIndex()
for i, s := range input {
err = iw.AddSeries(uint32(i), s.labels, s.chunks...)
require.NoError(t, err)
mi.AddSeries(uint32(i), s.labels, s.chunks...)
for _, l := range s.labels {
valset, ok := values[l.Name]
if !ok {
valset = stringset{}
values[l.Name] = valset
}
valset.set(l.Value)
postings.add(uint32(i), term{name: l.Name, value: l.Value})
}
i++
}
for k, v := range values {
vals := v.slice()
require.NoError(t, iw.WriteLabelIndex([]string{k}, vals))
require.NoError(t, mi.WriteLabelIndex([]string{k}, vals))
}
all := make([]uint32, len(lbls))
for i := range all {
all[i] = uint32(i)
}
err = iw.WritePostings("", "", newListPostings(all))
require.NoError(t, err)
mi.WritePostings("", "", newListPostings(all))
for tm := range postings.m {
err = iw.WritePostings(tm.name, tm.value, postings.get(tm))
require.NoError(t, err)
mi.WritePostings(tm.name, tm.value, postings.get(tm))
}
err = iw.Close()
require.NoError(t, err)
ir, err := newIndexReader(dir)
require.NoError(t, err)
for p := range mi.postings {
gotp, err := ir.Postings(p.Name, p.Value)
require.NoError(t, err)
expp, err := mi.Postings(p.Name, p.Value)
for gotp.Next() {
require.True(t, expp.Next())
ref := gotp.At()
lset, chks, err := ir.Series(ref)
require.NoError(t, err)
explset, expchks, err := mi.Series(expp.At())
require.Equal(t, explset, lset)
require.Equal(t, expchks, chks)
}
require.False(t, expp.Next())
require.NoError(t, gotp.Err())
}
for k, v := range mi.labelIndex {
tplsExp, err := newStringTuples(v, 1)
require.NoError(t, err)
tplsRes, err := ir.LabelValues(k)
require.NoError(t, err)
require.Equal(t, tplsExp.Len(), tplsRes.Len())
for i := 0; i < tplsExp.Len(); i++ {
strsExp, err := tplsExp.At(i)
require.NoError(t, err)
strsRes, err := tplsRes.At(i)
require.NoError(t, err)
require.Equal(t, strsExp, strsRes)
}
}
require.NoError(t, ir.Close())
}