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675 lines
18 KiB
675 lines
18 KiB
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package index
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import (
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"context"
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"errors"
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"fmt"
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"hash/crc32"
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"os"
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"path/filepath"
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"slices"
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"sort"
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"strconv"
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"testing"
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"github.com/stretchr/testify/require"
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"go.uber.org/goleak"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/tsdb/chunkenc"
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"github.com/prometheus/prometheus/tsdb/chunks"
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"github.com/prometheus/prometheus/tsdb/encoding"
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"github.com/prometheus/prometheus/util/testutil"
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)
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func TestMain(m *testing.M) {
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goleak.VerifyTestMain(m)
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}
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type series struct {
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l labels.Labels
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chunks []chunks.Meta
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}
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type mockIndex struct {
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series map[storage.SeriesRef]series
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postings map[labels.Label][]storage.SeriesRef
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symbols map[string]struct{}
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}
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func newMockIndex() mockIndex {
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ix := mockIndex{
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series: make(map[storage.SeriesRef]series),
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postings: make(map[labels.Label][]storage.SeriesRef),
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symbols: make(map[string]struct{}),
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}
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ix.postings[allPostingsKey] = []storage.SeriesRef{}
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return ix
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}
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func (m mockIndex) Symbols() (map[string]struct{}, error) {
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return m.symbols, nil
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}
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func (m mockIndex) AddSeries(ref storage.SeriesRef, l labels.Labels, chunks ...chunks.Meta) error {
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if _, ok := m.series[ref]; ok {
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return fmt.Errorf("series with reference %d already added", ref)
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}
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l.Range(func(lbl labels.Label) {
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m.symbols[lbl.Name] = struct{}{}
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m.symbols[lbl.Value] = struct{}{}
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if _, ok := m.postings[lbl]; !ok {
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m.postings[lbl] = []storage.SeriesRef{}
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}
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m.postings[lbl] = append(m.postings[lbl], ref)
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})
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m.postings[allPostingsKey] = append(m.postings[allPostingsKey], ref)
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s := series{l: l}
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// Actual chunk data is not stored in the index.
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for _, c := range chunks {
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c.Chunk = nil
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s.chunks = append(s.chunks, c)
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}
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m.series[ref] = s
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return nil
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}
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func (m mockIndex) Close() error {
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return nil
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}
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func (m mockIndex) LabelValues(_ context.Context, name string) ([]string, error) {
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values := []string{}
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for l := range m.postings {
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if l.Name == name {
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values = append(values, l.Value)
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}
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}
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return values, nil
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}
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func (m mockIndex) Postings(ctx context.Context, name string, values ...string) (Postings, error) {
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p := []Postings{}
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for _, value := range values {
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l := labels.Label{Name: name, Value: value}
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p = append(p, m.SortedPostings(NewListPostings(m.postings[l])))
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}
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return Merge(ctx, p...), nil
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}
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func (m mockIndex) SortedPostings(p Postings) Postings {
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ep, err := ExpandPostings(p)
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if err != nil {
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return ErrPostings(fmt.Errorf("expand postings: %w", err))
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}
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sort.Slice(ep, func(i, j int) bool {
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return labels.Compare(m.series[ep[i]].l, m.series[ep[j]].l) < 0
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})
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return NewListPostings(ep)
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}
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func (m mockIndex) Series(ref storage.SeriesRef, builder *labels.ScratchBuilder, chks *[]chunks.Meta) error {
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s, ok := m.series[ref]
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if !ok {
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return errors.New("not found")
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}
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builder.Assign(s.l)
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*chks = append((*chks)[:0], s.chunks...)
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return nil
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}
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func TestIndexRW_Create_Open(t *testing.T) {
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dir := t.TempDir()
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fn := filepath.Join(dir, indexFilename)
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// An empty index must still result in a readable file.
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iw, err := NewWriter(context.Background(), fn)
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require.NoError(t, err)
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require.NoError(t, iw.Close())
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ir, err := NewFileReader(fn)
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require.NoError(t, err)
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require.NoError(t, ir.Close())
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// Modify magic header must cause open to fail.
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f, err := os.OpenFile(fn, os.O_WRONLY, 0o666)
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require.NoError(t, err)
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_, err = f.WriteAt([]byte{0, 0}, 0)
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require.NoError(t, err)
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f.Close()
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_, err = NewFileReader(dir)
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require.Error(t, err)
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}
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func TestIndexRW_Postings(t *testing.T) {
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ctx := context.Background()
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var input indexWriterSeriesSlice
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for i := 1; i < 5; i++ {
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input = append(input, &indexWriterSeries{
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labels: labels.FromStrings("a", "1", "b", strconv.Itoa(i)),
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})
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}
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ir, fn, _ := createFileReader(ctx, t, input)
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p, err := ir.Postings(ctx, "a", "1")
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require.NoError(t, err)
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var c []chunks.Meta
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var builder labels.ScratchBuilder
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for i := 0; p.Next(); i++ {
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err := ir.Series(p.At(), &builder, &c)
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require.NoError(t, err)
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require.Empty(t, c)
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testutil.RequireEqual(t, input[i].labels, builder.Labels())
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}
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require.NoError(t, p.Err())
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// The label indices are no longer used, so test them by hand here.
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labelValuesOffsets := map[string]uint64{}
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d := encoding.NewDecbufAt(ir.b, int(ir.toc.LabelIndicesTable), castagnoliTable)
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cnt := d.Be32()
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for d.Err() == nil && d.Len() > 0 && cnt > 0 {
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require.Equal(t, 1, d.Uvarint(), "Unexpected number of keys for label indices table")
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lbl := d.UvarintStr()
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off := d.Uvarint64()
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labelValuesOffsets[lbl] = off
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cnt--
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}
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require.NoError(t, d.Err())
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labelIndices := map[string][]string{}
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for lbl, off := range labelValuesOffsets {
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d := encoding.NewDecbufAt(ir.b, int(off), castagnoliTable)
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require.Equal(t, 1, d.Be32int(), "Unexpected number of label indices table names")
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for i := d.Be32(); i > 0 && d.Err() == nil; i-- {
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v, err := ir.lookupSymbol(ctx, d.Be32())
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require.NoError(t, err)
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labelIndices[lbl] = append(labelIndices[lbl], v)
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}
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require.NoError(t, d.Err())
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}
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require.Equal(t, map[string][]string{
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"a": {"1"},
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"b": {"1", "2", "3", "4"},
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}, labelIndices)
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t.Run("ShardedPostings()", func(t *testing.T) {
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ir, err := NewFileReader(fn)
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require.NoError(t, err)
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t.Cleanup(func() {
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require.NoError(t, ir.Close())
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})
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// List all postings for a given label value. This is what we expect to get
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// in output from all shards.
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p, err = ir.Postings(ctx, "a", "1")
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require.NoError(t, err)
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var expected []storage.SeriesRef
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for p.Next() {
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expected = append(expected, p.At())
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}
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require.NoError(t, p.Err())
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require.NotEmpty(t, expected)
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// Query the same postings for each shard.
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const shardCount = uint64(4)
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actualShards := make(map[uint64][]storage.SeriesRef)
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actualPostings := make([]storage.SeriesRef, 0, len(expected))
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for shardIndex := uint64(0); shardIndex < shardCount; shardIndex++ {
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p, err = ir.Postings(ctx, "a", "1")
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require.NoError(t, err)
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p = ir.ShardedPostings(p, shardIndex, shardCount)
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for p.Next() {
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ref := p.At()
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actualShards[shardIndex] = append(actualShards[shardIndex], ref)
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actualPostings = append(actualPostings, ref)
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}
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require.NoError(t, p.Err())
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}
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// We expect the postings merged out of shards is the exact same of the non sharded ones.
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require.ElementsMatch(t, expected, actualPostings)
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// We expect the series in each shard are the expected ones.
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for shardIndex, ids := range actualShards {
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for _, id := range ids {
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var lbls labels.ScratchBuilder
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require.NoError(t, ir.Series(id, &lbls, nil))
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require.Equal(t, shardIndex, labels.StableHash(lbls.Labels())%shardCount)
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}
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}
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})
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}
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func TestPostingsMany(t *testing.T) {
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ctx := context.Background()
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// Create a label in the index which has 999 values.
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var input indexWriterSeriesSlice
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for i := 1; i < 1000; i++ {
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v := fmt.Sprintf("%03d", i)
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input = append(input, &indexWriterSeries{
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labels: labels.FromStrings("i", v, "foo", "bar"),
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})
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}
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ir, _, symbols := createFileReader(ctx, t, input)
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cases := []struct {
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in []string
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}{
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// Simple cases, everything is present.
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{in: []string{"002"}},
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{in: []string{"031", "032", "033"}},
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{in: []string{"032", "033"}},
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{in: []string{"127", "128"}},
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{in: []string{"127", "128", "129"}},
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{in: []string{"127", "129"}},
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{in: []string{"128", "129"}},
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{in: []string{"998", "999"}},
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{in: []string{"999"}},
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// Before actual values.
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{in: []string{"000"}},
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{in: []string{"000", "001"}},
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{in: []string{"000", "002"}},
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// After actual values.
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{in: []string{"999a"}},
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{in: []string{"999", "999a"}},
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{in: []string{"998", "999", "999a"}},
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// In the middle of actual values.
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{in: []string{"126a", "127", "128"}},
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{in: []string{"127", "127a", "128"}},
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{in: []string{"127", "127a", "128", "128a", "129"}},
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{in: []string{"127", "128a", "129"}},
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{in: []string{"128", "128a", "129"}},
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{in: []string{"128", "129", "129a"}},
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{in: []string{"126a", "126b", "127", "127a", "127b", "128", "128a", "128b", "129", "129a", "129b"}},
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}
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var builder labels.ScratchBuilder
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for _, c := range cases {
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it, err := ir.Postings(ctx, "i", c.in...)
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require.NoError(t, err)
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got := []string{}
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var metas []chunks.Meta
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for it.Next() {
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require.NoError(t, ir.Series(it.At(), &builder, &metas))
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got = append(got, builder.Labels().Get("i"))
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}
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require.NoError(t, it.Err())
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exp := []string{}
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for _, e := range c.in {
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if _, ok := symbols[e]; ok && e != "l" {
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exp = append(exp, e)
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}
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}
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require.Equal(t, exp, got, fmt.Sprintf("input: %v", c.in))
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}
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}
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func TestPersistence_index_e2e(t *testing.T) {
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ctx := context.Background()
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lbls, err := labels.ReadLabels(filepath.Join("..", "testdata", "20kseries.json"), 20000)
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require.NoError(t, err)
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// Sort labels as the index writer expects series in sorted order.
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sort.Sort(labels.Slice(lbls))
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var input indexWriterSeriesSlice
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ref := uint64(0)
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// Generate ChunkMetas for every label set.
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for i, lset := range lbls {
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var metas []chunks.Meta
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for j := 0; j <= (i % 20); j++ {
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ref++
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metas = append(metas, chunks.Meta{
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MinTime: int64(j * 10000),
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MaxTime: int64((j+1)*10000) - 1,
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Ref: chunks.ChunkRef(ref),
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Chunk: chunkenc.NewXORChunk(),
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})
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}
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input = append(input, &indexWriterSeries{
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labels: lset,
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chunks: metas,
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})
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}
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ir, _, _ := createFileReader(ctx, t, input)
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// Population procedure as done by compaction.
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var (
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postings = NewMemPostings()
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values = map[string]map[string]struct{}{}
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)
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mi := newMockIndex()
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for i, s := range input {
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require.NoError(t, mi.AddSeries(storage.SeriesRef(i), s.labels, s.chunks...))
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s.labels.Range(func(l labels.Label) {
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valset, ok := values[l.Name]
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if !ok {
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valset = map[string]struct{}{}
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values[l.Name] = valset
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}
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valset[l.Value] = struct{}{}
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})
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postings.Add(storage.SeriesRef(i), s.labels)
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}
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for p := range mi.postings {
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gotp, err := ir.Postings(ctx, p.Name, p.Value)
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require.NoError(t, err)
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expp, err := mi.Postings(ctx, p.Name, p.Value)
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require.NoError(t, err)
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var chks, expchks []chunks.Meta
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var builder, eBuilder labels.ScratchBuilder
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for gotp.Next() {
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require.True(t, expp.Next())
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ref := gotp.At()
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err := ir.Series(ref, &builder, &chks)
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require.NoError(t, err)
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err = mi.Series(expp.At(), &eBuilder, &expchks)
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require.NoError(t, err)
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testutil.RequireEqual(t, eBuilder.Labels(), builder.Labels())
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require.Equal(t, expchks, chks)
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}
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require.False(t, expp.Next(), "Expected no more postings for %q=%q", p.Name, p.Value)
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require.NoError(t, gotp.Err())
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}
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labelPairs := map[string][]string{}
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for l := range mi.postings {
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labelPairs[l.Name] = append(labelPairs[l.Name], l.Value)
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}
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for k, v := range labelPairs {
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sort.Strings(v)
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res, err := ir.SortedLabelValues(ctx, k)
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require.NoError(t, err)
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require.Equal(t, len(v), len(res))
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for i := 0; i < len(v); i++ {
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require.Equal(t, v[i], res[i])
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}
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}
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gotSymbols := []string{}
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it := ir.Symbols()
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for it.Next() {
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gotSymbols = append(gotSymbols, it.At())
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}
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require.NoError(t, it.Err())
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expSymbols := []string{}
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for s := range mi.symbols {
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expSymbols = append(expSymbols, s)
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}
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sort.Strings(expSymbols)
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require.Equal(t, expSymbols, gotSymbols)
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}
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func TestWriter_ShouldReturnErrorOnSeriesWithDuplicatedLabelNames(t *testing.T) {
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w, err := NewWriter(context.Background(), filepath.Join(t.TempDir(), "index"))
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require.NoError(t, err)
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require.NoError(t, w.AddSymbol("__name__"))
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require.NoError(t, w.AddSymbol("metric_1"))
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require.NoError(t, w.AddSymbol("metric_2"))
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require.NoError(t, w.AddSeries(0, labels.FromStrings("__name__", "metric_1", "__name__", "metric_2")))
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err = w.Close()
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require.Error(t, err)
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require.ErrorContains(t, err, "corruption detected when writing postings to index")
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}
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func TestDecbufUvarintWithInvalidBuffer(t *testing.T) {
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b := realByteSlice([]byte{0x81, 0x81, 0x81, 0x81, 0x81, 0x81})
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db := encoding.NewDecbufUvarintAt(b, 0, castagnoliTable)
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require.Error(t, db.Err())
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}
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func TestReaderWithInvalidBuffer(t *testing.T) {
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b := realByteSlice([]byte{0x81, 0x81, 0x81, 0x81, 0x81, 0x81})
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_, err := NewReader(b)
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require.Error(t, err)
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}
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// TestNewFileReaderErrorNoOpenFiles ensures that in case of an error no file remains open.
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func TestNewFileReaderErrorNoOpenFiles(t *testing.T) {
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dir := testutil.NewTemporaryDirectory("block", t)
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idxName := filepath.Join(dir.Path(), "index")
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err := os.WriteFile(idxName, []byte("corrupted contents"), 0o666)
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require.NoError(t, err)
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_, err = NewFileReader(idxName)
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require.Error(t, err)
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// dir.Close will fail on Win if idxName fd is not closed on error path.
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dir.Close()
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}
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func TestSymbols(t *testing.T) {
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buf := encoding.Encbuf{}
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// Add prefix to the buffer to simulate symbols as part of larger buffer.
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buf.PutUvarintStr("something")
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symbolsStart := buf.Len()
|
|
buf.PutBE32int(204) // Length of symbols table.
|
|
buf.PutBE32int(100) // Number of symbols.
|
|
for i := 0; i < 100; i++ {
|
|
// i represents index in unicode characters table.
|
|
buf.PutUvarintStr(string(rune(i))) // Symbol.
|
|
}
|
|
checksum := crc32.Checksum(buf.Get()[symbolsStart+4:], castagnoliTable)
|
|
buf.PutBE32(checksum) // Check sum at the end.
|
|
|
|
s, err := NewSymbols(realByteSlice(buf.Get()), FormatV2, symbolsStart)
|
|
require.NoError(t, err)
|
|
|
|
// We store only 4 offsets to symbols.
|
|
require.Equal(t, 32, s.Size())
|
|
|
|
for i := 99; i >= 0; i-- {
|
|
s, err := s.Lookup(uint32(i))
|
|
require.NoError(t, err)
|
|
require.Equal(t, string(rune(i)), s)
|
|
}
|
|
_, err = s.Lookup(100)
|
|
require.Error(t, err)
|
|
|
|
for i := 99; i >= 0; i-- {
|
|
r, err := s.ReverseLookup(string(rune(i)))
|
|
require.NoError(t, err)
|
|
require.Equal(t, uint32(i), r)
|
|
}
|
|
_, err = s.ReverseLookup(string(rune(100)))
|
|
require.Error(t, err)
|
|
|
|
iter := s.Iter()
|
|
i := 0
|
|
for iter.Next() {
|
|
require.Equal(t, string(rune(i)), iter.At())
|
|
i++
|
|
}
|
|
require.NoError(t, iter.Err())
|
|
}
|
|
|
|
func BenchmarkReader_ShardedPostings(b *testing.B) {
|
|
const (
|
|
numSeries = 10000
|
|
numShards = 16
|
|
)
|
|
|
|
ctx := context.Background()
|
|
var input indexWriterSeriesSlice
|
|
for i := 1; i <= numSeries; i++ {
|
|
input = append(input, &indexWriterSeries{
|
|
labels: labels.FromStrings("const", fmt.Sprintf("%10d", 1), "unique", fmt.Sprintf("%10d", i)),
|
|
})
|
|
}
|
|
ir, _, _ := createFileReader(ctx, b, input)
|
|
b.ResetTimer()
|
|
|
|
for n := 0; n < b.N; n++ {
|
|
allPostings, err := ir.Postings(ctx, "const", fmt.Sprintf("%10d", 1))
|
|
require.NoError(b, err)
|
|
|
|
ir.ShardedPostings(allPostings, uint64(n%numShards), numShards)
|
|
}
|
|
}
|
|
|
|
func TestDecoder_Postings_WrongInput(t *testing.T) {
|
|
_, _, err := (&Decoder{}).Postings([]byte("the cake is a lie"))
|
|
require.Error(t, err)
|
|
}
|
|
|
|
func TestChunksRefOrdering(t *testing.T) {
|
|
dir := t.TempDir()
|
|
|
|
idx, err := NewWriter(context.Background(), filepath.Join(dir, "index"))
|
|
require.NoError(t, err)
|
|
|
|
require.NoError(t, idx.AddSymbol("1"))
|
|
require.NoError(t, idx.AddSymbol("2"))
|
|
require.NoError(t, idx.AddSymbol("__name__"))
|
|
|
|
c50 := chunks.Meta{Ref: 50}
|
|
c100 := chunks.Meta{Ref: 100}
|
|
c200 := chunks.Meta{Ref: 200}
|
|
|
|
require.NoError(t, idx.AddSeries(1, labels.FromStrings("__name__", "1"), c100))
|
|
require.EqualError(t, idx.AddSeries(2, labels.FromStrings("__name__", "2"), c50), "unsorted chunk reference: 50, previous: 100")
|
|
require.NoError(t, idx.AddSeries(2, labels.FromStrings("__name__", "2"), c200))
|
|
require.NoError(t, idx.Close())
|
|
}
|
|
|
|
func TestChunksTimeOrdering(t *testing.T) {
|
|
dir := t.TempDir()
|
|
|
|
idx, err := NewWriter(context.Background(), filepath.Join(dir, "index"))
|
|
require.NoError(t, err)
|
|
|
|
require.NoError(t, idx.AddSymbol("1"))
|
|
require.NoError(t, idx.AddSymbol("2"))
|
|
require.NoError(t, idx.AddSymbol("__name__"))
|
|
|
|
require.NoError(t, idx.AddSeries(1, labels.FromStrings("__name__", "1"),
|
|
chunks.Meta{Ref: 1, MinTime: 0, MaxTime: 10}, // Also checks that first chunk can have MinTime: 0.
|
|
chunks.Meta{Ref: 2, MinTime: 11, MaxTime: 20},
|
|
chunks.Meta{Ref: 3, MinTime: 21, MaxTime: 30},
|
|
))
|
|
|
|
require.EqualError(t, idx.AddSeries(1, labels.FromStrings("__name__", "2"),
|
|
chunks.Meta{Ref: 10, MinTime: 0, MaxTime: 10},
|
|
chunks.Meta{Ref: 20, MinTime: 10, MaxTime: 20},
|
|
), "chunk minT 10 is not higher than previous chunk maxT 10")
|
|
|
|
require.EqualError(t, idx.AddSeries(1, labels.FromStrings("__name__", "2"),
|
|
chunks.Meta{Ref: 10, MinTime: 100, MaxTime: 30},
|
|
), "chunk maxT 30 is less than minT 100")
|
|
|
|
require.NoError(t, idx.Close())
|
|
}
|
|
|
|
func TestReader_PostingsForLabelMatchingHonorsContextCancel(t *testing.T) {
|
|
const seriesCount = 1000
|
|
var input indexWriterSeriesSlice
|
|
for i := 1; i < seriesCount; i++ {
|
|
input = append(input, &indexWriterSeries{
|
|
labels: labels.FromStrings("__name__", fmt.Sprintf("%4d", i)),
|
|
chunks: []chunks.Meta{
|
|
{Ref: 1, MinTime: 0, MaxTime: 10},
|
|
},
|
|
})
|
|
}
|
|
ir, _, _ := createFileReader(context.Background(), t, input)
|
|
|
|
failAfter := uint64(seriesCount / 2) // Fail after processing half of the series.
|
|
ctx := &testutil.MockContextErrAfter{FailAfter: failAfter}
|
|
p := ir.PostingsForLabelMatching(ctx, "__name__", func(string) bool {
|
|
return true
|
|
})
|
|
require.Error(t, p.Err())
|
|
require.Equal(t, failAfter, ctx.Count())
|
|
}
|
|
|
|
// createFileReader creates a temporary index file. It writes the provided input to this file.
|
|
// It returns a Reader for this file, the file's name, and the symbol map.
|
|
func createFileReader(ctx context.Context, tb testing.TB, input indexWriterSeriesSlice) (*Reader, string, map[string]struct{}) {
|
|
tb.Helper()
|
|
|
|
fn := filepath.Join(tb.TempDir(), indexFilename)
|
|
|
|
iw, err := NewWriter(ctx, fn)
|
|
require.NoError(tb, err)
|
|
|
|
symbols := map[string]struct{}{}
|
|
for _, s := range input {
|
|
s.labels.Range(func(l labels.Label) {
|
|
symbols[l.Name] = struct{}{}
|
|
symbols[l.Value] = struct{}{}
|
|
})
|
|
}
|
|
|
|
syms := []string{}
|
|
for s := range symbols {
|
|
syms = append(syms, s)
|
|
}
|
|
slices.Sort(syms)
|
|
for _, s := range syms {
|
|
require.NoError(tb, iw.AddSymbol(s))
|
|
}
|
|
for i, s := range input {
|
|
require.NoError(tb, iw.AddSeries(storage.SeriesRef(i), s.labels, s.chunks...))
|
|
}
|
|
require.NoError(tb, iw.Close())
|
|
|
|
ir, err := NewFileReader(fn)
|
|
require.NoError(tb, err)
|
|
tb.Cleanup(func() {
|
|
require.NoError(tb, ir.Close())
|
|
})
|
|
return ir, fn, symbols
|
|
}
|