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Merge pull request #9500 from codesome/resettests

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Add unit test for counter reset header
This commit is contained in:
Björn Rabenstein 2021-10-13 18:19:21 +02:00 committed by GitHub
parent 311673d62e dcaf568279
commit 7309c20e7e
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 162 additions and 57 deletions
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42
tsdb/chunkenc/histogram.go
View file

@ -64,27 +64,32 @@ func (c *HistogramChunk) NumSamples() int {
return int(binary.BigEndian.Uint16(c.Bytes()))
}
// Meta returns the histogram metadata. Only call this on chunks that have at
// Layout returns the histogram layout. Only call this on chunks that have at
// least one sample.
func (c *HistogramChunk) Meta() (
func (c *HistogramChunk) Layout() (
schema int32, zeroThreshold float64,
negativeSpans, positiveSpans []histogram.Span,
err error,
) {
if c.NumSamples() == 0 {
panic("HistoChunk.Meta() called on an empty chunk")
panic("HistoChunk.Layout() called on an empty chunk")
}
b := newBReader(c.Bytes()[2:])
return readHistogramChunkMeta(&b)
return readHistogramChunkLayout(&b)
}
// CounterResetHeader defines the first 2 bits of the chunk header.
type CounterResetHeader byte
const (
// CounterReset means there was definitely a counter reset that resulted in this chunk.
CounterReset CounterResetHeader = 0b10000000
// NotCounterReset means there was definitely no counter reset when cutting this chunk.
NotCounterReset CounterResetHeader = 0b01000000
// GaugeType means this chunk contains a gauge histogram, where counter resets do not happen.
GaugeType CounterResetHeader = 0b11000000
// UnknownCounterReset means we cannot say if this chunk was created due to a counter reset or not.
// An explicit counter reset detection needs to happen during query time.
UnknownCounterReset CounterResetHeader = 0b00000000
)
@ -171,9 +176,9 @@ func newHistogramIterator(b []byte) *histogramIterator {
numTotal: binary.BigEndian.Uint16(b),
t: math.MinInt64,
}
// The first 2 bytes contain chunk headers.
// The first 3 bytes contain chunk headers.
// We skip that for actual samples.
_, _ = it.br.readBits(16)
_, _ = it.br.readBits(24)
return it
}
@ -198,7 +203,7 @@ func (c *HistogramChunk) Iterator(it Iterator) Iterator {
type HistogramAppender struct {
b *bstream
// Metadata:
// Layout:
schema int32
zThreshold float64
pSpans, nSpans []histogram.Span
@ -389,18 +394,23 @@ func (a *HistogramAppender) AppendHistogram(t int64, h histogram.Histogram) {
if value.IsStaleNaN(h.Sum) {
// Emptying out other fields to write no buckets, and an empty
// meta in case of first histogram in the chunk.
// layout in case of first histogram in the chunk.
h = histogram.Histogram{Sum: h.Sum}
}
switch num {
case 0:
// The first append gets the privilege to dictate the metadata
// The first append gets the privilege to dictate the layout
// but it's also responsible for encoding it into the chunk!
writeHistogramChunkMeta(a.b, h.Schema, h.ZeroThreshold, h.PositiveSpans, h.NegativeSpans)
writeHistogramChunkLayout(a.b, h.Schema, h.ZeroThreshold, h.PositiveSpans, h.NegativeSpans)
a.schema = h.Schema
a.zThreshold = h.ZeroThreshold
a.pSpans, a.nSpans = h.PositiveSpans, h.NegativeSpans
a.pSpans = make([]histogram.Span, len(h.PositiveSpans))
copy(a.pSpans, h.PositiveSpans)
a.nSpans = make([]histogram.Span, len(h.NegativeSpans))
copy(a.nSpans, h.NegativeSpans)
numPBuckets, numNBuckets := countSpans(h.PositiveSpans), countSpans(h.NegativeSpans)
a.pBuckets = make([]int64, numPBuckets)
a.nBuckets = make([]int64, numNBuckets)
@ -486,7 +496,8 @@ func (a *HistogramAppender) AppendHistogram(t int64, h histogram.Histogram) {
a.cntDelta = cntDelta
a.zCntDelta = zCntDelta
a.pBuckets, a.nBuckets = h.PositiveBuckets, h.NegativeBuckets
copy(a.pBuckets, h.PositiveBuckets)
copy(a.nBuckets, h.NegativeBuckets)
// Note that the bucket deltas were already updated above.
a.sum = h.Sum
}
@ -580,7 +591,7 @@ type histogramIterator struct {
numTotal uint16
numRead uint16
// Metadata:
// Layout:
schema int32
zThreshold float64
pSpans, nSpans []histogram.Span
@ -669,11 +680,10 @@ func (it *histogramIterator) Next() bool {
}
if it.numRead == 0 {
// The first read is responsible for reading the chunk metadata
// The first read is responsible for reading the chunk layout
// and for initializing fields that depend on it. We give
// counter reset info at chunk level, hence we discard it here.
schema, zeroThreshold, posSpans, negSpans, err := readHistogramChunkMeta(&it.br)
schema, zeroThreshold, posSpans, negSpans, err := readHistogramChunkLayout(&it.br)
if err != nil {
it.err = err
return false

21
tsdb/chunkenc/histogram_meta.go
View file

@ -17,14 +17,14 @@ import (
"github.com/prometheus/prometheus/model/histogram"
)
func writeHistogramChunkMeta(b *bstream, schema int32, zeroThreshold float64, positiveSpans, negativeSpans []histogram.Span) {
func writeHistogramChunkLayout(b *bstream, schema int32, zeroThreshold float64, positiveSpans, negativeSpans []histogram.Span) {
putVarbitInt(b, int64(schema))
putVarbitFloat(b, zeroThreshold)
putHistogramChunkMetaSpans(b, positiveSpans)
putHistogramChunkMetaSpans(b, negativeSpans)
putHistogramChunkLayoutSpans(b, positiveSpans)
putHistogramChunkLayoutSpans(b, negativeSpans)
}
func putHistogramChunkMetaSpans(b *bstream, spans []histogram.Span) {
func putHistogramChunkLayoutSpans(b *bstream, spans []histogram.Span) {
putVarbitInt(b, int64(len(spans)))
for _, s := range spans {
putVarbitInt(b, int64(s.Length))
@ -32,16 +32,11 @@ func putHistogramChunkMetaSpans(b *bstream, spans []histogram.Span) {
}
}
func readHistogramChunkMeta(b *bstreamReader) (
func readHistogramChunkLayout(b *bstreamReader) (
schema int32, zeroThreshold float64,
positiveSpans, negativeSpans []histogram.Span,
err error,
) {
_, err = b.ReadByte() // The header.
if err != nil {
return
}
v, err := readVarbitInt(b)
if err != nil {
return
@ -53,12 +48,12 @@ func readHistogramChunkMeta(b *bstreamReader) (
return
}
positiveSpans, err = readHistogramChunkMetaSpans(b)
positiveSpans, err = readHistogramChunkLayoutSpans(b)
if err != nil {
return
}
negativeSpans, err = readHistogramChunkMetaSpans(b)
negativeSpans, err = readHistogramChunkLayoutSpans(b)
if err != nil {
return
}
@ -66,7 +61,7 @@ func readHistogramChunkMeta(b *bstreamReader) (
return
}
func readHistogramChunkMetaSpans(b *bstreamReader) ([]histogram.Span, error) {
func readHistogramChunkLayoutSpans(b *bstreamReader) ([]histogram.Span, error) {
var spans []histogram.Span
num, err := readVarbitInt(b)
if err != nil {

24
tsdb/head.go
View file

@ -273,8 +273,8 @@ type headMetrics struct {
// Sparse histogram metrics for experiments.
// TODO: remove these in the final version.
sparseHistogramSamplesTotal prometheus.Counter
sparseHistogramSeries prometheus.Gauge
histogramSamplesTotal prometheus.Counter
histogramSeries prometheus.Gauge
}
func newHeadMetrics(h *Head, r prometheus.Registerer) *headMetrics {
@ -373,13 +373,13 @@ func newHeadMetrics(h *Head, r prometheus.Registerer) *headMetrics {
Name: "prometheus_tsdb_snapshot_replay_error_total",
Help: "Total number snapshot replays that failed.",
}),
sparseHistogramSamplesTotal: prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_sparse_histogram_samples_total",
Help: "Total number of sparse histograms samples added.",
histogramSamplesTotal: prometheus.NewCounter(prometheus.CounterOpts{
Name: "prometheus_tsdb_histogram_samples_total",
Help: "Total number of histograms samples added.",
}),
sparseHistogramSeries: prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_tsdb_sparse_histogram_series",
Help: "Number of sparse histogram series currently present in the head block.",
histogramSeries: prometheus.NewGauge(prometheus.GaugeOpts{
Name: "prometheus_tsdb_histogram_series",
Help: "Number of histogram series currently present in the head block.",
}),
}
@ -408,8 +408,8 @@ func newHeadMetrics(h *Head, r prometheus.Registerer) *headMetrics {
m.checkpointCreationTotal,
m.mmapChunkCorruptionTotal,
m.snapshotReplayErrorTotal,
m.sparseHistogramSamplesTotal,
m.sparseHistogramSeries,
m.histogramSamplesTotal,
m.histogramSeries,
// Metrics bound to functions and not needed in tests
// can be created and registered on the spot.
prometheus.NewGaugeFunc(prometheus.GaugeOpts{
@ -619,7 +619,7 @@ func (h *Head) Init(minValidTime int64) error {
}
}
}
h.metrics.sparseHistogramSeries.Set(float64(sparseHistogramSeries))
h.metrics.histogramSeries.Set(float64(sparseHistogramSeries))
}
walReplayDuration := time.Since(start)
@ -1145,7 +1145,7 @@ func (h *Head) gc() int64 {
h.metrics.seriesRemoved.Add(float64(seriesRemoved))
h.metrics.chunksRemoved.Add(float64(chunksRemoved))
h.metrics.chunks.Sub(float64(chunksRemoved))
h.metrics.sparseHistogramSeries.Sub(float64(sparseHistogramSeriesDeleted))
h.metrics.histogramSeries.Sub(float64(sparseHistogramSeriesDeleted))
h.numSeries.Sub(uint64(seriesRemoved))
// Remove deleted series IDs from the postings lists.

14
tsdb/head_append.go
View file

@ -398,7 +398,7 @@ func (a *headAppender) AppendHistogram(ref uint64, lset labels.Labels, t int64,
}
s.histogramSeries = true
if created {
a.head.metrics.sparseHistogramSeries.Inc()
a.head.metrics.histogramSeries.Inc()
a.series = append(a.series, record.RefSeries{
Ref: s.ref,
Labels: lset,
@ -561,7 +561,7 @@ func (a *headAppender) Commit() (err error) {
series.Unlock()
if ok {
a.head.metrics.sparseHistogramSamplesTotal.Inc()
a.head.metrics.histogramSamplesTotal.Inc()
} else {
total--
a.head.metrics.outOfOrderSamples.Inc()
@ -606,7 +606,7 @@ func (s *memSeries) append(t int64, v float64, appendID uint64, chunkDiskMapper
// appendHistogram adds the histogram.
// It is unsafe to call this concurrently with s.iterator(...) without holding the series lock.
func (s *memSeries) appendHistogram(t int64, sh histogram.Histogram, appendID uint64, chunkDiskMapper *chunks.ChunkDiskMapper) (sampleInOrder, chunkCreated bool) {
func (s *memSeries) appendHistogram(t int64, h histogram.Histogram, appendID uint64, chunkDiskMapper *chunks.ChunkDiskMapper) (sampleInOrder, chunkCreated bool) {
// Head controls the execution of recoding, so that we own the proper chunk reference afterwards.
// We check for Appendable before appendPreprocessor because in case it ends up creating a new chunk,
// we need to know if there was also a counter reset or not to set the meta properly.
@ -616,7 +616,7 @@ func (s *memSeries) appendHistogram(t int64, sh histogram.Histogram, appendID ui
okToAppend, counterReset bool
)
if app != nil {
positiveInterjections, negativeInterjections, okToAppend, counterReset = app.Appendable(sh)
positiveInterjections, negativeInterjections, okToAppend, counterReset = app.Appendable(h)
}
c, sampleInOrder, chunkCreated := s.appendPreprocessor(t, chunkenc.EncHistogram, chunkDiskMapper)
@ -636,7 +636,7 @@ func (s *memSeries) appendHistogram(t int64, sh histogram.Histogram, appendID ui
// New buckets have appeared. We need to recode all
// prior histogram samples within the chunk before we
// can process this one.
chunk, app := app.Recode(positiveInterjections, negativeInterjections, sh.PositiveSpans, sh.NegativeSpans)
chunk, app := app.Recode(positiveInterjections, negativeInterjections, h.PositiveSpans, h.NegativeSpans)
s.headChunk = &memChunk{
minTime: s.headChunk.minTime,
maxTime: s.headChunk.maxTime,
@ -657,7 +657,7 @@ func (s *memSeries) appendHistogram(t int64, sh histogram.Histogram, appendID ui
hc.SetCounterResetHeader(header)
}
s.app.AppendHistogram(t, sh)
s.app.AppendHistogram(t, h)
s.histogramSeries = true
c.maxTime = t
@ -665,7 +665,7 @@ func (s *memSeries) appendHistogram(t int64, sh histogram.Histogram, appendID ui
s.histogramBuf[0] = s.histogramBuf[1]
s.histogramBuf[1] = s.histogramBuf[2]
s.histogramBuf[2] = s.histogramBuf[3]
s.histogramBuf[3] = histogramSample{t: t, h: sh}
s.histogramBuf[3] = histogramSample{t: t, h: h}
if appendID > 0 {
s.txs.add(appendID)

112
tsdb/head_test.go
View file

@ -2950,7 +2950,7 @@ func TestSnapshotError(t *testing.T) {
require.Equal(t, 0, len(tm))
}
func TestSparseHistogramMetrics(t *testing.T) {
func TestHistogramMetrics(t *testing.T) {
head, _ := newTestHead(t, 1000, false)
t.Cleanup(func() {
require.NoError(t, head.Close())
@ -2971,8 +2971,8 @@ func TestSparseHistogramMetrics(t *testing.T) {
}
}
require.Equal(t, float64(expHSeries), prom_testutil.ToFloat64(head.metrics.sparseHistogramSeries))
require.Equal(t, float64(expHSamples), prom_testutil.ToFloat64(head.metrics.sparseHistogramSamplesTotal))
require.Equal(t, float64(expHSeries), prom_testutil.ToFloat64(head.metrics.histogramSeries))
require.Equal(t, float64(expHSamples), prom_testutil.ToFloat64(head.metrics.histogramSamplesTotal))
require.NoError(t, head.Close())
w, err := wal.NewSize(nil, nil, head.wal.Dir(), 32768, false)
@ -2981,11 +2981,11 @@ func TestSparseHistogramMetrics(t *testing.T) {
require.NoError(t, err)
require.NoError(t, head.Init(0))
require.Equal(t, float64(expHSeries), prom_testutil.ToFloat64(head.metrics.sparseHistogramSeries))
require.Equal(t, float64(0), prom_testutil.ToFloat64(head.metrics.sparseHistogramSamplesTotal)) // Counter reset.
require.Equal(t, float64(expHSeries), prom_testutil.ToFloat64(head.metrics.histogramSeries))
require.Equal(t, float64(0), prom_testutil.ToFloat64(head.metrics.histogramSamplesTotal)) // Counter reset.
}
func TestSparseHistogramStaleSample(t *testing.T) {
func TestHistogramStaleSample(t *testing.T) {
l := labels.Labels{{Name: "a", Value: "b"}}
numHistograms := 20
head, _ := newTestHead(t, 100000, false)
@ -3078,3 +3078,103 @@ func TestSparseHistogramStaleSample(t *testing.T) {
require.Equal(t, 1, len(s.mmappedChunks))
testQuery(2)
}
func TestHistogramCounterResetHeader(t *testing.T) {
l := labels.Labels{{Name: "a", Value: "b"}}
head, _ := newTestHead(t, 1000, false)
t.Cleanup(func() {
require.NoError(t, head.Close())
})
require.NoError(t, head.Init(0))
ts := int64(0)
appendHistogram := func(h histogram.Histogram) {
ts++
app := head.Appender(context.Background())
_, err := app.AppendHistogram(0, l, ts, h)
require.NoError(t, err)
require.NoError(t, app.Commit())
}
var expHeaders []chunkenc.CounterResetHeader
checkExpCounterResetHeader := func(newHeaders ...chunkenc.CounterResetHeader) {
expHeaders = append(expHeaders, newHeaders...)
ms, _, err := head.getOrCreate(l.Hash(), l)
require.NoError(t, err)
require.Len(t, ms.mmappedChunks, len(expHeaders)-1) // One is the head chunk.
for i, mmapChunk := range ms.mmappedChunks {
chk, err := head.chunkDiskMapper.Chunk(mmapChunk.ref)
require.NoError(t, err)
require.Equal(t, expHeaders[i], chk.(*chunkenc.HistogramChunk).GetCounterResetHeader())
}
require.Equal(t, expHeaders[len(expHeaders)-1], ms.headChunk.chunk.(*chunkenc.HistogramChunk).GetCounterResetHeader())
}
h := generateHistograms(1)[0]
if len(h.NegativeBuckets) == 0 {
h.NegativeSpans = append([]histogram.Span{}, h.PositiveSpans...)
h.NegativeBuckets = append([]int64{}, h.PositiveBuckets...)
}
h.PositiveBuckets[0] = 100
h.NegativeBuckets[0] = 100
// First histogram is UnknownCounterReset.
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.UnknownCounterReset)
// Another normal histogram.
h.Count++
appendHistogram(h)
checkExpCounterResetHeader()
// Counter reset via Count.
h.Count--
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.CounterReset)
// Add 2 non-counter reset histograms.
for i := 0; i < 250; i++ {
appendHistogram(h)
}
checkExpCounterResetHeader(chunkenc.NotCounterReset, chunkenc.NotCounterReset)
// Changing schema will cut a new chunk with unknown counter reset.
h.Schema++
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.UnknownCounterReset)
// Changing schema will zero threshold a new chunk with unknown counter reset.
h.ZeroThreshold += 0.01
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.UnknownCounterReset)
// Counter reset by removing a positive bucket.
h.PositiveSpans[1].Length--
h.PositiveBuckets = h.PositiveBuckets[1:]
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.CounterReset)
// Counter reset by removing a negative bucket.
h.NegativeSpans[1].Length--
h.NegativeBuckets = h.NegativeBuckets[1:]
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.CounterReset)
// Add 2 non-counter reset histograms. Just to have some non-counter reset chunks in between.
for i := 0; i < 250; i++ {
appendHistogram(h)
}
checkExpCounterResetHeader(chunkenc.NotCounterReset, chunkenc.NotCounterReset)
// Counter reset with counter reset in a positive bucket.
h.PositiveBuckets[len(h.PositiveBuckets)-1]--
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.CounterReset)
// Counter reset with counter reset in a negative bucket.
h.NegativeBuckets[len(h.NegativeBuckets)-1]--
appendHistogram(h)
checkExpCounterResetHeader(chunkenc.CounterReset)
}