prometheus/tsdb/block_test.go
beorn7 817a2396cb Name float values as "floats", not as "values"
In the past, every sample value was a float, so it was fine to call a
variable holding such a float "value" or "sample". With native
histograms, a sample might have a histogram value. And a histogram
value is still a value. Calling a float value just "value" or "sample"
or "V" is therefore misleading. Over the last few commits, I already
renamed many variables, but this cleans up a few more places where the
changes are more invasive.

Note that we do not to attempt naming in the JSON APIs or in the
protobufs. That would be quite a disruption. However, internally, we
can call variables as we want, and we should go with the option of
avoiding misunderstandings.

Signed-off-by: beorn7 <beorn@grafana.com>
2023-04-13 19:25:24 +02:00

738 lines
24 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 (
"context"
"encoding/binary"
"errors"
"fmt"
"hash/crc32"
"math/rand"
"os"
"path/filepath"
"sort"
"strconv"
"testing"
"github.com/go-kit/log"
prom_testutil "github.com/prometheus/client_golang/prometheus/testutil"
"github.com/stretchr/testify/require"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/tsdb/chunkenc"
"github.com/prometheus/prometheus/tsdb/chunks"
"github.com/prometheus/prometheus/tsdb/fileutil"
"github.com/prometheus/prometheus/tsdb/tsdbutil"
"github.com/prometheus/prometheus/tsdb/wlog"
)
// In Prometheus 2.1.0 we had a bug where the meta.json version was falsely bumped
// to 2. We had a migration in place resetting it to 1 but we should move immediately to
// version 3 next time to avoid confusion and issues.
func TestBlockMetaMustNeverBeVersion2(t *testing.T) {
dir := t.TempDir()
_, err := writeMetaFile(log.NewNopLogger(), dir, &BlockMeta{})
require.NoError(t, err)
meta, _, err := readMetaFile(dir)
require.NoError(t, err)
require.NotEqual(t, 2, meta.Version, "meta.json version must never be 2")
}
func TestSetCompactionFailed(t *testing.T) {
tmpdir := t.TempDir()
blockDir := createBlock(t, tmpdir, genSeries(1, 1, 0, 1))
b, err := OpenBlock(nil, blockDir, nil)
require.NoError(t, err)
require.Equal(t, false, b.meta.Compaction.Failed)
require.NoError(t, b.setCompactionFailed())
require.Equal(t, true, b.meta.Compaction.Failed)
require.NoError(t, b.Close())
b, err = OpenBlock(nil, blockDir, nil)
require.NoError(t, err)
require.Equal(t, true, b.meta.Compaction.Failed)
require.NoError(t, b.Close())
}
func TestCreateBlock(t *testing.T) {
tmpdir := t.TempDir()
b, err := OpenBlock(nil, createBlock(t, tmpdir, genSeries(1, 1, 0, 10)), nil)
require.NoError(t, err)
require.NoError(t, b.Close())
}
func BenchmarkOpenBlock(b *testing.B) {
tmpdir := b.TempDir()
blockDir := createBlock(b, tmpdir, genSeries(1e6, 20, 0, 10))
b.Run("benchmark", func(b *testing.B) {
for i := 0; i < b.N; i++ {
block, err := OpenBlock(nil, blockDir, nil)
require.NoError(b, err)
require.NoError(b, block.Close())
}
})
}
func TestCorruptedChunk(t *testing.T) {
for _, tc := range []struct {
name string
corrFunc func(f *os.File) // Func that applies the corruption.
openErr error
iterErr error
}{
{
name: "invalid header size",
corrFunc: func(f *os.File) {
require.NoError(t, f.Truncate(1))
},
openErr: errors.New("invalid segment header in segment 0: invalid size"),
},
{
name: "invalid magic number",
corrFunc: func(f *os.File) {
magicChunksOffset := int64(0)
_, err := f.Seek(magicChunksOffset, 0)
require.NoError(t, err)
// Set invalid magic number.
b := make([]byte, chunks.MagicChunksSize)
binary.BigEndian.PutUint32(b[:chunks.MagicChunksSize], 0x00000000)
n, err := f.Write(b)
require.NoError(t, err)
require.Equal(t, chunks.MagicChunksSize, n)
},
openErr: errors.New("invalid magic number 0"),
},
{
name: "invalid chunk format version",
corrFunc: func(f *os.File) {
chunksFormatVersionOffset := int64(4)
_, err := f.Seek(chunksFormatVersionOffset, 0)
require.NoError(t, err)
// Set invalid chunk format version.
b := make([]byte, chunks.ChunksFormatVersionSize)
b[0] = 0
n, err := f.Write(b)
require.NoError(t, err)
require.Equal(t, chunks.ChunksFormatVersionSize, n)
},
openErr: errors.New("invalid chunk format version 0"),
},
{
name: "chunk not enough bytes to read the chunk length",
corrFunc: func(f *os.File) {
// Truncate one byte after the segment header.
require.NoError(t, f.Truncate(chunks.SegmentHeaderSize+1))
},
iterErr: errors.New("cannot populate chunk 8 from block 00000000000000000000000000: segment doesn't include enough bytes to read the chunk size data field - required:13, available:9"),
},
{
name: "chunk not enough bytes to read the data",
corrFunc: func(f *os.File) {
fi, err := f.Stat()
require.NoError(t, err)
require.NoError(t, f.Truncate(fi.Size()-1))
},
iterErr: errors.New("cannot populate chunk 8 from block 00000000000000000000000000: segment doesn't include enough bytes to read the chunk - required:26, available:25"),
},
{
name: "checksum mismatch",
corrFunc: func(f *os.File) {
fi, err := f.Stat()
require.NoError(t, err)
// Get the chunk data end offset.
chkEndOffset := int(fi.Size()) - crc32.Size
// Seek to the last byte of chunk data and modify it.
_, err = f.Seek(int64(chkEndOffset-1), 0)
require.NoError(t, err)
n, err := f.Write([]byte("x"))
require.NoError(t, err)
require.Equal(t, n, 1)
},
iterErr: errors.New("cannot populate chunk 8 from block 00000000000000000000000000: checksum mismatch expected:cfc0526c, actual:34815eae"),
},
} {
t.Run(tc.name, func(t *testing.T) {
tmpdir := t.TempDir()
series := storage.NewListSeries(labels.FromStrings("a", "b"), []tsdbutil.Sample{sample{1, 1, nil, nil}})
blockDir := createBlock(t, tmpdir, []storage.Series{series})
files, err := sequenceFiles(chunkDir(blockDir))
require.NoError(t, err)
require.Greater(t, len(files), 0, "No chunk created.")
f, err := os.OpenFile(files[0], os.O_RDWR, 0o666)
require.NoError(t, err)
// Apply corruption function.
tc.corrFunc(f)
require.NoError(t, f.Close())
// Check open err.
b, err := OpenBlock(nil, blockDir, nil)
if tc.openErr != nil {
require.Equal(t, tc.openErr.Error(), err.Error())
return
}
defer func() { require.NoError(t, b.Close()) }()
querier, err := NewBlockQuerier(b, 0, 1)
require.NoError(t, err)
defer func() { require.NoError(t, querier.Close()) }()
set := querier.Select(false, nil, labels.MustNewMatcher(labels.MatchEqual, "a", "b"))
// Check chunk errors during iter time.
require.True(t, set.Next())
it := set.At().Iterator(nil)
require.Equal(t, chunkenc.ValNone, it.Next())
require.Equal(t, tc.iterErr.Error(), it.Err().Error())
})
}
}
func TestLabelValuesWithMatchers(t *testing.T) {
tmpdir := t.TempDir()
var seriesEntries []storage.Series
for i := 0; i < 100; i++ {
seriesEntries = append(seriesEntries, storage.NewListSeries(labels.FromStrings(
"tens", fmt.Sprintf("value%d", i/10),
"unique", fmt.Sprintf("value%d", i),
), []tsdbutil.Sample{sample{100, 0, nil, nil}}))
}
blockDir := createBlock(t, tmpdir, seriesEntries)
files, err := sequenceFiles(chunkDir(blockDir))
require.NoError(t, err)
require.Greater(t, len(files), 0, "No chunk created.")
// Check open err.
block, err := OpenBlock(nil, blockDir, nil)
require.NoError(t, err)
defer func() { require.NoError(t, block.Close()) }()
indexReader, err := block.Index()
require.NoError(t, err)
defer func() { require.NoError(t, indexReader.Close()) }()
testCases := []struct {
name string
labelName string
matchers []*labels.Matcher
expectedValues []string
}{
{
name: "get tens based on unique id",
labelName: "tens",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "unique", "value35")},
expectedValues: []string{"value3"},
}, {
name: "get unique ids based on a ten",
labelName: "unique",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "tens", "value1")},
expectedValues: []string{"value10", "value11", "value12", "value13", "value14", "value15", "value16", "value17", "value18", "value19"},
}, {
name: "get tens by pattern matching on unique id",
labelName: "tens",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchRegexp, "unique", "value[5-7]5")},
expectedValues: []string{"value5", "value6", "value7"},
}, {
name: "get tens by matching for absence of unique label",
labelName: "tens",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchNotEqual, "unique", "")},
expectedValues: []string{"value0", "value1", "value2", "value3", "value4", "value5", "value6", "value7", "value8", "value9"},
},
}
for _, tt := range testCases {
t.Run(tt.name, func(t *testing.T) {
actualValues, err := indexReader.SortedLabelValues(tt.labelName, tt.matchers...)
require.NoError(t, err)
require.Equal(t, tt.expectedValues, actualValues)
actualValues, err = indexReader.LabelValues(tt.labelName, tt.matchers...)
sort.Strings(actualValues)
require.NoError(t, err)
require.Equal(t, tt.expectedValues, actualValues)
})
}
}
// TestBlockSize ensures that the block size is calculated correctly.
func TestBlockSize(t *testing.T) {
tmpdir := t.TempDir()
var (
blockInit *Block
expSizeInit int64
blockDirInit string
err error
)
// Create a block and compare the reported size vs actual disk size.
{
blockDirInit = createBlock(t, tmpdir, genSeries(10, 1, 1, 100))
blockInit, err = OpenBlock(nil, blockDirInit, nil)
require.NoError(t, err)
defer func() {
require.NoError(t, blockInit.Close())
}()
expSizeInit = blockInit.Size()
actSizeInit, err := fileutil.DirSize(blockInit.Dir())
require.NoError(t, err)
require.Equal(t, expSizeInit, actSizeInit)
}
// Delete some series and check the sizes again.
{
require.NoError(t, blockInit.Delete(1, 10, labels.MustNewMatcher(labels.MatchRegexp, "", ".*")))
expAfterDelete := blockInit.Size()
require.Greater(t, expAfterDelete, expSizeInit, "after a delete the block size should be bigger as the tombstone file should grow %v > %v", expAfterDelete, expSizeInit)
actAfterDelete, err := fileutil.DirSize(blockDirInit)
require.NoError(t, err)
require.Equal(t, expAfterDelete, actAfterDelete, "after a delete reported block size doesn't match actual disk size")
c, err := NewLeveledCompactor(context.Background(), nil, log.NewNopLogger(), []int64{0}, nil, nil)
require.NoError(t, err)
blockDirAfterCompact, err := c.Compact(tmpdir, []string{blockInit.Dir()}, nil)
require.NoError(t, err)
blockAfterCompact, err := OpenBlock(nil, filepath.Join(tmpdir, blockDirAfterCompact.String()), nil)
require.NoError(t, err)
defer func() {
require.NoError(t, blockAfterCompact.Close())
}()
expAfterCompact := blockAfterCompact.Size()
actAfterCompact, err := fileutil.DirSize(blockAfterCompact.Dir())
require.NoError(t, err)
require.Greater(t, actAfterDelete, actAfterCompact, "after a delete and compaction the block size should be smaller %v,%v", actAfterDelete, actAfterCompact)
require.Equal(t, expAfterCompact, actAfterCompact, "after a delete and compaction reported block size doesn't match actual disk size")
}
}
func TestReadIndexFormatV1(t *testing.T) {
/* The block here was produced at the commit
706602daed1487f7849990678b4ece4599745905 used in 2.0.0 with:
db, _ := Open("v1db", nil, nil, nil)
app := db.Appender()
app.Add(labels.FromStrings("foo", "bar"), 1, 2)
app.Add(labels.FromStrings("foo", "baz"), 3, 4)
app.Add(labels.FromStrings("foo", "meh"), 1000*3600*4, 4) // Not in the block.
// Make sure we've enough values for the lack of sorting of postings offsets to show up.
for i := 0; i < 100; i++ {
app.Add(labels.FromStrings("bar", strconv.FormatInt(int64(i), 10)), 0, 0)
}
app.Commit()
db.compact()
db.Close()
*/
blockDir := filepath.Join("testdata", "index_format_v1")
block, err := OpenBlock(nil, blockDir, nil)
require.NoError(t, err)
q, err := NewBlockQuerier(block, 0, 1000)
require.NoError(t, err)
require.Equal(t, query(t, q, labels.MustNewMatcher(labels.MatchEqual, "foo", "bar")),
map[string][]tsdbutil.Sample{`{foo="bar"}`: {sample{t: 1, f: 2}}})
q, err = NewBlockQuerier(block, 0, 1000)
require.NoError(t, err)
require.Equal(t, query(t, q, labels.MustNewMatcher(labels.MatchNotRegexp, "foo", "^.?$")),
map[string][]tsdbutil.Sample{
`{foo="bar"}`: {sample{t: 1, f: 2}},
`{foo="baz"}`: {sample{t: 3, f: 4}},
})
}
func BenchmarkLabelValuesWithMatchers(b *testing.B) {
tmpdir := b.TempDir()
var seriesEntries []storage.Series
metricCount := 1000000
for i := 0; i < metricCount; i++ {
// Note these series are not created in sort order: 'value2' sorts after 'value10'.
// This makes a big difference to the benchmark timing.
seriesEntries = append(seriesEntries, storage.NewListSeries(labels.FromStrings(
"a_unique", fmt.Sprintf("value%d", i),
"b_tens", fmt.Sprintf("value%d", i/(metricCount/10)),
"c_ninety", fmt.Sprintf("value%d", i/(metricCount/10)/9), // "0" for the first 90%, then "1"
), []tsdbutil.Sample{sample{100, 0, nil, nil}}))
}
blockDir := createBlock(b, tmpdir, seriesEntries)
files, err := sequenceFiles(chunkDir(blockDir))
require.NoError(b, err)
require.Greater(b, len(files), 0, "No chunk created.")
// Check open err.
block, err := OpenBlock(nil, blockDir, nil)
require.NoError(b, err)
defer func() { require.NoError(b, block.Close()) }()
indexReader, err := block.Index()
require.NoError(b, err)
defer func() { require.NoError(b, indexReader.Close()) }()
matchers := []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "c_ninety", "value0")}
b.ResetTimer()
b.ReportAllocs()
for benchIdx := 0; benchIdx < b.N; benchIdx++ {
actualValues, err := indexReader.LabelValues("b_tens", matchers...)
require.NoError(b, err)
require.Equal(b, 9, len(actualValues))
}
}
func TestLabelNamesWithMatchers(t *testing.T) {
tmpdir := t.TempDir()
var seriesEntries []storage.Series
for i := 0; i < 100; i++ {
seriesEntries = append(seriesEntries, storage.NewListSeries(labels.FromStrings(
"unique", fmt.Sprintf("value%d", i),
), []tsdbutil.Sample{sample{100, 0, nil, nil}}))
if i%10 == 0 {
seriesEntries = append(seriesEntries, storage.NewListSeries(labels.FromStrings(
"tens", fmt.Sprintf("value%d", i/10),
"unique", fmt.Sprintf("value%d", i),
), []tsdbutil.Sample{sample{100, 0, nil, nil}}))
}
if i%20 == 0 {
seriesEntries = append(seriesEntries, storage.NewListSeries(labels.FromStrings(
"tens", fmt.Sprintf("value%d", i/10),
"twenties", fmt.Sprintf("value%d", i/20),
"unique", fmt.Sprintf("value%d", i),
), []tsdbutil.Sample{sample{100, 0, nil, nil}}))
}
}
blockDir := createBlock(t, tmpdir, seriesEntries)
files, err := sequenceFiles(chunkDir(blockDir))
require.NoError(t, err)
require.Greater(t, len(files), 0, "No chunk created.")
// Check open err.
block, err := OpenBlock(nil, blockDir, nil)
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, block.Close()) })
indexReader, err := block.Index()
require.NoError(t, err)
t.Cleanup(func() { require.NoError(t, indexReader.Close()) })
testCases := []struct {
name string
labelName string
matchers []*labels.Matcher
expectedNames []string
}{
{
name: "get with non-empty unique: all",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchNotEqual, "unique", "")},
expectedNames: []string{"tens", "twenties", "unique"},
}, {
name: "get with unique ending in 1: only unique",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchRegexp, "unique", "value.*1")},
expectedNames: []string{"unique"},
}, {
name: "get with unique = value20: all",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "unique", "value20")},
expectedNames: []string{"tens", "twenties", "unique"},
}, {
name: "get tens = 1: unique & tens",
matchers: []*labels.Matcher{labels.MustNewMatcher(labels.MatchEqual, "tens", "value1")},
expectedNames: []string{"tens", "unique"},
},
}
for _, tt := range testCases {
t.Run(tt.name, func(t *testing.T) {
actualNames, err := indexReader.LabelNames(tt.matchers...)
require.NoError(t, err)
require.Equal(t, tt.expectedNames, actualNames)
})
}
}
// createBlock creates a block with given set of series and returns its dir.
func createBlock(tb testing.TB, dir string, series []storage.Series) string {
blockDir, err := CreateBlock(series, dir, 0, log.NewNopLogger())
require.NoError(tb, err)
return blockDir
}
func createBlockFromHead(tb testing.TB, dir string, head *Head) string {
compactor, err := NewLeveledCompactor(context.Background(), nil, log.NewNopLogger(), []int64{1000000}, nil, nil)
require.NoError(tb, err)
require.NoError(tb, os.MkdirAll(dir, 0o777))
// Add +1 millisecond to block maxt because block intervals are half-open: [b.MinTime, b.MaxTime).
// Because of this block intervals are always +1 than the total samples it includes.
ulid, err := compactor.Write(dir, head, head.MinTime(), head.MaxTime()+1, nil)
require.NoError(tb, err)
return filepath.Join(dir, ulid.String())
}
func createHead(tb testing.TB, w *wlog.WL, series []storage.Series, chunkDir string) *Head {
opts := DefaultHeadOptions()
opts.ChunkDirRoot = chunkDir
head, err := NewHead(nil, nil, w, nil, opts, nil)
require.NoError(tb, err)
var it chunkenc.Iterator
ctx := context.Background()
app := head.Appender(ctx)
for _, s := range series {
ref := storage.SeriesRef(0)
it = s.Iterator(it)
lset := s.Labels()
typ := it.Next()
lastTyp := typ
for ; typ != chunkenc.ValNone; typ = it.Next() {
if lastTyp != typ {
// The behaviour of appender is undefined if samples of different types
// are appended to the same series in a single Commit().
require.NoError(tb, app.Commit())
app = head.Appender(ctx)
}
switch typ {
case chunkenc.ValFloat:
t, v := it.At()
ref, err = app.Append(ref, lset, t, v)
case chunkenc.ValHistogram:
t, h := it.AtHistogram()
ref, err = app.AppendHistogram(ref, lset, t, h, nil)
case chunkenc.ValFloatHistogram:
t, fh := it.AtFloatHistogram()
ref, err = app.AppendHistogram(ref, lset, t, nil, fh)
default:
err = fmt.Errorf("unknown sample type %s", typ.String())
}
require.NoError(tb, err)
lastTyp = typ
}
require.NoError(tb, it.Err())
}
require.NoError(tb, app.Commit())
return head
}
func createHeadWithOOOSamples(tb testing.TB, w *wlog.WL, series []storage.Series, chunkDir string, oooSampleFrequency int) *Head {
opts := DefaultHeadOptions()
opts.ChunkDirRoot = chunkDir
opts.OutOfOrderTimeWindow.Store(10000000000)
head, err := NewHead(nil, nil, w, nil, opts, nil)
require.NoError(tb, err)
oooSampleLabels := make([]labels.Labels, 0, len(series))
oooSamples := make([]tsdbutil.SampleSlice, 0, len(series))
var it chunkenc.Iterator
totalSamples := 0
app := head.Appender(context.Background())
for _, s := range series {
ref := storage.SeriesRef(0)
it = s.Iterator(it)
lset := s.Labels()
os := tsdbutil.SampleSlice{}
count := 0
for it.Next() == chunkenc.ValFloat {
totalSamples++
count++
t, v := it.At()
if count%oooSampleFrequency == 0 {
os = append(os, sample{t: t, f: v})
continue
}
ref, err = app.Append(ref, lset, t, v)
require.NoError(tb, err)
}
require.NoError(tb, it.Err())
if len(os) > 0 {
oooSampleLabels = append(oooSampleLabels, lset)
oooSamples = append(oooSamples, os)
}
}
require.NoError(tb, app.Commit())
oooSamplesAppended := 0
require.Equal(tb, float64(0), prom_testutil.ToFloat64(head.metrics.outOfOrderSamplesAppended))
app = head.Appender(context.Background())
for i, lset := range oooSampleLabels {
ref := storage.SeriesRef(0)
for _, sample := range oooSamples[i] {
ref, err = app.Append(ref, lset, sample.T(), sample.F())
require.NoError(tb, err)
oooSamplesAppended++
}
}
require.NoError(tb, app.Commit())
actOOOAppended := prom_testutil.ToFloat64(head.metrics.outOfOrderSamplesAppended)
require.GreaterOrEqual(tb, actOOOAppended, float64(oooSamplesAppended-len(series)))
require.LessOrEqual(tb, actOOOAppended, float64(oooSamplesAppended))
require.Equal(tb, float64(totalSamples), prom_testutil.ToFloat64(head.metrics.samplesAppended))
return head
}
const (
defaultLabelName = "labelName"
defaultLabelValue = "labelValue"
)
// genSeries generates series of float64 samples with a given number of labels and values.
func genSeries(totalSeries, labelCount int, mint, maxt int64) []storage.Series {
return genSeriesFromSampleGenerator(totalSeries, labelCount, mint, maxt, 1, func(ts int64) tsdbutil.Sample {
return sample{t: ts, f: rand.Float64()}
})
}
// genHistogramSeries generates series of histogram samples with a given number of labels and values.
func genHistogramSeries(totalSeries, labelCount int, mint, maxt, step int64, floatHistogram bool) []storage.Series {
return genSeriesFromSampleGenerator(totalSeries, labelCount, mint, maxt, step, func(ts int64) tsdbutil.Sample {
h := &histogram.Histogram{
Count: 5 + uint64(ts*4),
ZeroCount: 2 + uint64(ts),
ZeroThreshold: 0.001,
Sum: 18.4 * rand.Float64(),
Schema: 1,
PositiveSpans: []histogram.Span{
{Offset: 0, Length: 2},
{Offset: 1, Length: 2},
},
PositiveBuckets: []int64{int64(ts + 1), 1, -1, 0},
}
if ts != mint {
// By setting the counter reset hint to "no counter
// reset" for all histograms but the first, we cover the
// most common cases. If the series is manipulated later
// or spans more than one block when ingested into the
// storage, the hint has to be adjusted. Note that the
// storage itself treats this particular hint the same
// as "unknown".
h.CounterResetHint = histogram.NotCounterReset
}
if floatHistogram {
return sample{t: ts, fh: h.ToFloat()}
}
return sample{t: ts, h: h}
})
}
// genHistogramAndFloatSeries generates series of mixed histogram and float64 samples with a given number of labels and values.
func genHistogramAndFloatSeries(totalSeries, labelCount int, mint, maxt, step int64, floatHistogram bool) []storage.Series {
floatSample := false
count := 0
return genSeriesFromSampleGenerator(totalSeries, labelCount, mint, maxt, step, func(ts int64) tsdbutil.Sample {
count++
var s sample
if floatSample {
s = sample{t: ts, f: rand.Float64()}
} else {
h := &histogram.Histogram{
Count: 5 + uint64(ts*4),
ZeroCount: 2 + uint64(ts),
ZeroThreshold: 0.001,
Sum: 18.4 * rand.Float64(),
Schema: 1,
PositiveSpans: []histogram.Span{
{Offset: 0, Length: 2},
{Offset: 1, Length: 2},
},
PositiveBuckets: []int64{int64(ts + 1), 1, -1, 0},
}
if count > 1 && count%5 != 1 {
// Same rationale for this as above in
// genHistogramSeries, just that we have to be
// smarter to find out if the previous sample
// was a histogram, too.
h.CounterResetHint = histogram.NotCounterReset
}
if floatHistogram {
s = sample{t: ts, fh: h.ToFloat()}
} else {
s = sample{t: ts, h: h}
}
}
if count%5 == 0 {
// Flip the sample type for every 5 samples.
floatSample = !floatSample
}
return s
})
}
func genSeriesFromSampleGenerator(totalSeries, labelCount int, mint, maxt, step int64, generator func(ts int64) tsdbutil.Sample) []storage.Series {
if totalSeries == 0 || labelCount == 0 {
return nil
}
series := make([]storage.Series, totalSeries)
for i := 0; i < totalSeries; i++ {
lbls := make(map[string]string, labelCount)
lbls[defaultLabelName] = strconv.Itoa(i)
for j := 1; len(lbls) < labelCount; j++ {
lbls[defaultLabelName+strconv.Itoa(j)] = defaultLabelValue + strconv.Itoa(j)
}
samples := make([]tsdbutil.Sample, 0, (maxt-mint)/step+1)
for t := mint; t < maxt; t += step {
samples = append(samples, generator(t))
}
series[i] = storage.NewListSeries(labels.FromMap(lbls), samples)
}
return series
}
// populateSeries generates series from given labels, mint and maxt.
func populateSeries(lbls []map[string]string, mint, maxt int64) []storage.Series {
if len(lbls) == 0 {
return nil
}
series := make([]storage.Series, 0, len(lbls))
for _, lbl := range lbls {
if len(lbl) == 0 {
continue
}
samples := make([]tsdbutil.Sample, 0, maxt-mint+1)
for t := mint; t <= maxt; t++ {
samples = append(samples, sample{t: t, f: rand.Float64()})
}
series = append(series, storage.NewListSeries(labels.FromMap(lbl), samples))
}
return series
}