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1132 lines
34 KiB
1132 lines
34 KiB
// Copyright 2021 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 chunkenc
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import (
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"testing"
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"github.com/stretchr/testify/require"
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"github.com/prometheus/prometheus/model/histogram"
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)
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type result struct {
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t int64
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h *histogram.Histogram
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fh *histogram.FloatHistogram
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}
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func TestFirstHistogramExplicitCounterReset(t *testing.T) {
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tests := map[string]struct {
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hint histogram.CounterResetHint
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expHeader CounterResetHeader
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}{
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"CounterReset": {
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hint: histogram.CounterReset,
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expHeader: CounterReset,
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},
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"NotCounterReset": {
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hint: histogram.NotCounterReset,
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expHeader: UnknownCounterReset,
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},
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"UnknownCounterReset": {
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hint: histogram.UnknownCounterReset,
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expHeader: UnknownCounterReset,
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},
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"Gauge": {
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hint: histogram.GaugeType,
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expHeader: GaugeType,
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},
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}
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for name, test := range tests {
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t.Run(name, func(t *testing.T) {
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h := &histogram.Histogram{
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CounterResetHint: test.hint,
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}
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chk := NewHistogramChunk()
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app, err := chk.Appender()
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require.NoError(t, err)
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newChk, recoded, newApp, err := app.AppendHistogram(nil, 0, h, false)
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require.NoError(t, err)
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require.Nil(t, newChk)
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require.False(t, recoded)
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require.Equal(t, app, newApp)
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require.Equal(t, test.expHeader, chk.GetCounterResetHeader())
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})
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}
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}
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func TestHistogramChunkSameBuckets(t *testing.T) {
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c := NewHistogramChunk()
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var exp []result
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// Create fresh appender and add the first histogram.
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app, err := c.Appender()
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require.NoError(t, err)
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require.Equal(t, 0, c.NumSamples())
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ts := int64(1234567890)
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h := &histogram.Histogram{
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Count: 15,
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ZeroCount: 2,
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Sum: 18.4,
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ZeroThreshold: 1e-100,
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Schema: 1,
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PositiveSpans: []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 1, Length: 2},
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},
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PositiveBuckets: []int64{1, 1, -1, 0}, // counts: 1, 2, 1, 1 (total 5)
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NegativeSpans: []histogram.Span{
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{Offset: 1, Length: 1},
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{Offset: 2, Length: 3},
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},
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NegativeBuckets: []int64{2, 1, -1, -1}, // counts: 2, 3, 2, 1 (total 8)
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}
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chk, _, app, err := app.AppendHistogram(nil, ts, h, false)
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require.NoError(t, err)
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require.Nil(t, chk)
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exp = append(exp, result{t: ts, h: h, fh: h.ToFloat()})
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require.Equal(t, 1, c.NumSamples())
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// Add an updated histogram.
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ts += 16
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h = h.Copy()
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h.Count = 32
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h.ZeroCount++
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h.Sum = 24.4
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h.PositiveBuckets = []int64{5, -2, 1, -2} // counts: 5, 3, 4, 2 (total 14)
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h.NegativeBuckets = []int64{4, -1, 1, -1} // counts: 4, 3, 4, 4 (total 15)
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chk, _, _, err = app.AppendHistogram(nil, ts, h, false)
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require.NoError(t, err)
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require.Nil(t, chk)
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hExp := h.Copy()
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hExp.CounterResetHint = histogram.NotCounterReset
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exp = append(exp, result{t: ts, h: hExp, fh: hExp.ToFloat()})
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require.Equal(t, 2, c.NumSamples())
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// Add update with new appender.
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app, err = c.Appender()
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require.NoError(t, err)
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ts += 14
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h = h.Copy()
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h.Count = 54
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h.ZeroCount += 2
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h.Sum = 24.4
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h.PositiveBuckets = []int64{6, 1, -3, 6} // counts: 6, 7, 4, 10 (total 27)
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h.NegativeBuckets = []int64{5, 1, -2, 3} // counts: 5, 6, 4, 7 (total 22)
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chk, _, _, err = app.AppendHistogram(nil, ts, h, false)
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require.NoError(t, err)
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require.Nil(t, chk)
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hExp = h.Copy()
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hExp.CounterResetHint = histogram.NotCounterReset
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exp = append(exp, result{t: ts, h: hExp, fh: hExp.ToFloat()})
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require.Equal(t, 3, c.NumSamples())
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// 1. Expand iterator in simple case.
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it := c.Iterator(nil)
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require.NoError(t, it.Err())
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var act []result
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for it.Next() == ValHistogram {
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ts, h := it.AtHistogram()
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fts, fh := it.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act = append(act, result{t: ts, h: h, fh: fh})
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}
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require.NoError(t, it.Err())
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require.Equal(t, exp, act)
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// 2. Expand second iterator while reusing first one.
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it2 := c.Iterator(it)
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var act2 []result
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for it2.Next() == ValHistogram {
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ts, h := it2.AtHistogram()
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fts, fh := it2.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act2 = append(act2, result{t: ts, h: h, fh: fh})
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}
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require.NoError(t, it2.Err())
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require.Equal(t, exp, act2)
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// 3. Now recycle an iterator that was never used to access anything.
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itX := c.Iterator(nil)
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for itX.Next() == ValHistogram { // nolint:revive
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// Just iterate through without accessing anything.
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}
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it3 := c.iterator(itX)
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var act3 []result
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for it3.Next() == ValHistogram {
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ts, h := it3.AtHistogram()
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fts, fh := it3.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act3 = append(act3, result{t: ts, h: h, fh: fh})
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}
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require.NoError(t, it3.Err())
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require.Equal(t, exp, act3)
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// 4. Test iterator Seek.
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mid := len(exp) / 2
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it4 := c.Iterator(nil)
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var act4 []result
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require.Equal(t, ValHistogram, it4.Seek(exp[mid].t))
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// Below ones should not matter.
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require.Equal(t, ValHistogram, it4.Seek(exp[mid].t))
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require.Equal(t, ValHistogram, it4.Seek(exp[mid].t))
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ts, h = it4.AtHistogram()
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fts, fh := it4.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act4 = append(act4, result{t: ts, h: h, fh: fh})
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for it4.Next() == ValHistogram {
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ts, h := it4.AtHistogram()
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fts, fh := it4.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act4 = append(act4, result{t: ts, h: h, fh: fh})
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}
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require.NoError(t, it4.Err())
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require.Equal(t, exp[mid:], act4)
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require.Equal(t, ValNone, it4.Seek(exp[len(exp)-1].t+1))
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}
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// Mimics the scenario described for expandSpansForward.
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func TestHistogramChunkBucketChanges(t *testing.T) {
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c := Chunk(NewHistogramChunk())
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// Create fresh appender and add the first histogram.
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app, err := c.Appender()
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require.NoError(t, err)
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require.Equal(t, 0, c.NumSamples())
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ts1 := int64(1234567890)
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h1 := &histogram.Histogram{
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Count: 27,
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ZeroCount: 2,
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Sum: 18.4,
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ZeroThreshold: 1e-125,
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Schema: 1,
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PositiveSpans: []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 2, Length: 1},
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{Offset: 3, Length: 2},
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{Offset: 3, Length: 1},
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{Offset: 1, Length: 1},
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},
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PositiveBuckets: []int64{6, -3, 0, -1, 2, 1, -4}, // counts: 6, 3, 3, 2, 4, 5, 1 (total 24)
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NegativeSpans: []histogram.Span{{Offset: 1, Length: 1}},
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NegativeBuckets: []int64{1},
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}
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chk, _, app, err := app.AppendHistogram(nil, ts1, h1, false)
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require.NoError(t, err)
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require.Nil(t, chk)
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require.Equal(t, 1, c.NumSamples())
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// Add a new histogram that has expanded buckets.
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ts2 := ts1 + 16
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h2 := h1.Copy()
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h2.PositiveSpans = []histogram.Span{
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{Offset: 0, Length: 3},
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{Offset: 1, Length: 1},
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{Offset: 1, Length: 4},
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{Offset: 3, Length: 3},
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}
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h2.NegativeSpans = []histogram.Span{{Offset: 0, Length: 2}}
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h2.Count = 35
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h2.ZeroCount++
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h2.Sum = 30
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// Existing histogram should get values converted from the above to:
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// 6 3 0 3 0 0 2 4 5 0 1 (previous values with some new empty buckets in between)
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// so the new histogram should have new counts >= these per-bucket counts, e.g.:
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h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 1} // 7 5 1 3 1 0 2 5 5 0 1 (total 30)
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// Existing histogram should get values converted from the above to:
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// 0 1 (previous values with some new empty buckets in between)
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// so the new histogram should have new counts >= these per-bucket counts, e.g.:
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h2.NegativeBuckets = []int64{2, -1} // 2 1 (total 3)
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// This is how span changes will be handled.
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hApp, _ := app.(*HistogramAppender)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Greater(t, len(posInterjections), 0)
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require.Greater(t, len(negInterjections), 0)
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require.True(t, ok) // Only new buckets came in.
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require.False(t, cr)
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c, app = hApp.recode(posInterjections, negInterjections, h2.PositiveSpans, h2.NegativeSpans)
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chk, _, _, err = app.AppendHistogram(nil, ts2, h2, false)
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require.NoError(t, err)
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require.Nil(t, chk)
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require.Equal(t, 2, c.NumSamples())
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// Because the 2nd histogram has expanded buckets, we should expect all
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// histograms (in particular the first) to come back using the new spans
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// metadata as well as the expanded buckets.
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h1.PositiveSpans = h2.PositiveSpans
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h1.PositiveBuckets = []int64{6, -3, -3, 3, -3, 0, 2, 2, 1, -5, 1}
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h1.NegativeSpans = h2.NegativeSpans
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h1.NegativeBuckets = []int64{0, 1}
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hExp := h2.Copy()
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hExp.CounterResetHint = histogram.NotCounterReset
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exp := []result{
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{t: ts1, h: h1, fh: h1.ToFloat()},
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{t: ts2, h: hExp, fh: hExp.ToFloat()},
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}
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it := c.Iterator(nil)
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var act []result
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for it.Next() == ValHistogram {
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ts, h := it.AtHistogram()
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fts, fh := it.AtFloatHistogram()
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require.Equal(t, ts, fts)
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act = append(act, result{t: ts, h: h, fh: fh})
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}
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require.NoError(t, it.Err())
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require.Equal(t, exp, act)
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}
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func TestHistogramChunkAppendable(t *testing.T) {
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setup := func() (Chunk, *HistogramAppender, int64, *histogram.Histogram) {
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c := Chunk(NewHistogramChunk())
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// Create fresh appender and add the first histogram.
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app, err := c.Appender()
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require.NoError(t, err)
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require.Equal(t, 0, c.NumSamples())
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ts := int64(1234567890)
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h1 := &histogram.Histogram{
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Count: 5,
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ZeroCount: 2,
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Sum: 18.4,
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ZeroThreshold: 1e-125,
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Schema: 1,
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PositiveSpans: []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 2, Length: 1},
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{Offset: 3, Length: 2},
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{Offset: 3, Length: 1},
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{Offset: 1, Length: 1},
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},
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PositiveBuckets: []int64{6, -3, 0, -1, 2, 1, -4}, // counts: 6, 3, 3, 2, 4, 5, 1 (total 24)
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}
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chk, _, app, err := app.AppendHistogram(nil, ts, h1.Copy(), false)
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require.NoError(t, err)
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require.Nil(t, chk)
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require.Equal(t, 1, c.NumSamples())
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require.Equal(t, UnknownCounterReset, c.(*HistogramChunk).GetCounterResetHeader())
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return c, app.(*HistogramAppender), ts, h1
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}
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{ // Schema change.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.Schema++
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_, _, ok, _ := hApp.appendable(h2)
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require.False(t, ok)
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assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, UnknownCounterReset)
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}
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{ // Zero threshold change.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.ZeroThreshold += 0.1
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_, _, ok, _ := hApp.appendable(h2)
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require.False(t, ok)
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assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, UnknownCounterReset)
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}
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{ // New histogram that has more buckets.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.PositiveSpans = []histogram.Span{
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{Offset: 0, Length: 3},
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{Offset: 1, Length: 1},
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{Offset: 1, Length: 4},
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{Offset: 3, Length: 3},
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}
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h2.Count += 9
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h2.ZeroCount++
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h2.Sum = 30
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// Existing histogram should get values converted from the above to:
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// 6 3 0 3 0 0 2 4 5 0 1 (previous values with some new empty buckets in between)
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// so the new histogram should have new counts >= these per-bucket counts, e.g.:
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h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 1} // 7 5 1 3 1 0 2 5 5 0 1 (total 30)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Greater(t, len(posInterjections), 0)
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require.Equal(t, 0, len(negInterjections))
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require.True(t, ok) // Only new buckets came in.
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require.False(t, cr)
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assertRecodedHistogramChunkOnAppend(t, c, hApp, ts+1, h2, UnknownCounterReset)
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}
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{ // New histogram that has a bucket missing.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.PositiveSpans = []histogram.Span{
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{Offset: 0, Length: 2},
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{Offset: 5, Length: 2},
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{Offset: 3, Length: 1},
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{Offset: 1, Length: 1},
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}
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h2.Sum = 21
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h2.PositiveBuckets = []int64{6, -3, -1, 2, 1, -4} // counts: 6, 3, 2, 4, 5, 1 (total 21)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Equal(t, 0, len(posInterjections))
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require.Equal(t, 0, len(negInterjections))
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require.False(t, ok) // Need to cut a new chunk.
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require.True(t, cr)
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assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
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}
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{ // New histogram that has a counter reset while buckets are same.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.Sum = 23
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h2.PositiveBuckets = []int64{6, -4, 1, -1, 2, 1, -4} // counts: 6, 2, 3, 2, 4, 5, 1 (total 23)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Equal(t, 0, len(posInterjections))
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require.Equal(t, 0, len(negInterjections))
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require.False(t, ok) // Need to cut a new chunk.
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require.True(t, cr)
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assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
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}
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{ // New histogram that has a counter reset while new buckets were added.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.PositiveSpans = []histogram.Span{
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{Offset: 0, Length: 3},
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{Offset: 1, Length: 1},
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{Offset: 1, Length: 4},
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{Offset: 3, Length: 3},
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}
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h2.Sum = 29
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// Existing histogram should get values converted from the above to:
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// 6 3 0 3 0 0 2 4 5 0 1 (previous values with some new empty buckets in between)
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// so the new histogram should have new counts >= these per-bucket counts, e.g.:
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h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 0} // 7 5 1 3 1 0 2 5 5 0 0 (total 29)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Equal(t, 0, len(posInterjections))
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require.Equal(t, 0, len(negInterjections))
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require.False(t, ok) // Need to cut a new chunk.
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require.True(t, cr)
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assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
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}
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{
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// New histogram that has a counter reset while new buckets were
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// added before the first bucket and reset on first bucket. (to
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// catch the edge case where the new bucket should be forwarded
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// ahead until first old bucket at start)
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
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h2.PositiveSpans = []histogram.Span{
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{Offset: -3, Length: 2},
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{Offset: 1, Length: 2},
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{Offset: 2, Length: 1},
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{Offset: 3, Length: 2},
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{Offset: 3, Length: 1},
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{Offset: 1, Length: 1},
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}
|
|
h2.Sum = 26
|
|
// Existing histogram should get values converted from the above to:
|
|
// 0, 0, 6, 3, 3, 2, 4, 5, 1
|
|
// so the new histogram should have new counts >= these per-bucket counts, e.g.:
|
|
h2.PositiveBuckets = []int64{1, 1, 3, -2, 0, -1, 2, 1, -4} // counts: 1, 2, 5, 3, 3, 2, 4, 5, 1 (total 26)
|
|
|
|
posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
|
|
require.Equal(t, 0, len(posInterjections))
|
|
require.Equal(t, 0, len(negInterjections))
|
|
require.False(t, ok) // Need to cut a new chunk.
|
|
require.True(t, cr)
|
|
|
|
assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
|
|
}
|
|
|
|
{ // New histogram that has an explicit counter reset.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.CounterResetHint = histogram.CounterReset
|
|
|
|
assertNewHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
|
|
}
|
|
|
|
{ // Start new chunk explicitly, and append a new histogram that is considered appendable to the previous chunk.
|
|
_, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy() // Identity is appendable.
|
|
|
|
nextChunk := NewHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendHistogram(hApp, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newChunk)
|
|
require.False(t, recoded)
|
|
require.Equal(t, app, newApp)
|
|
assertSampleCount(t, nextChunk, 1, ValHistogram)
|
|
require.Equal(t, NotCounterReset, nextChunk.GetCounterResetHeader())
|
|
}
|
|
|
|
{ // Start new chunk explicitly, and append a new histogram that is not considered appendable to the previous chunk.
|
|
_, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.Count-- // Make this not appendable due to counter reset.
|
|
|
|
nextChunk := NewHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendHistogram(hApp, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newChunk)
|
|
require.False(t, recoded)
|
|
require.Equal(t, app, newApp)
|
|
assertSampleCount(t, nextChunk, 1, ValHistogram)
|
|
require.Equal(t, CounterReset, nextChunk.GetCounterResetHeader())
|
|
}
|
|
|
|
{ // Start new chunk explicitly, and append a new histogram that would need recoding if we added it to the chunk.
|
|
_, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: 0, Length: 3},
|
|
{Offset: 1, Length: 1},
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 3, Length: 3},
|
|
}
|
|
h2.Count += 9
|
|
h2.ZeroCount++
|
|
h2.Sum = 30
|
|
// Existing histogram should get values converted from the above to:
|
|
// 6 3 0 3 0 0 2 4 5 0 1 (previous values with some new empty buckets in between)
|
|
// so the new histogram should have new counts >= these per-bucket counts, e.g.:
|
|
h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 1} // 7 5 1 3 1 0 2 5 5 0 1 (total 30)
|
|
|
|
nextChunk := NewHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendHistogram(hApp, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newChunk)
|
|
require.False(t, recoded)
|
|
require.Equal(t, app, newApp)
|
|
assertSampleCount(t, nextChunk, 1, ValHistogram)
|
|
require.Equal(t, NotCounterReset, nextChunk.GetCounterResetHeader())
|
|
}
|
|
}
|
|
|
|
func assertNewHistogramChunkOnAppend(t *testing.T, oldChunk Chunk, hApp *HistogramAppender, ts int64, h *histogram.Histogram, expectHeader CounterResetHeader) {
|
|
oldChunkBytes := oldChunk.Bytes()
|
|
newChunk, recoded, newAppender, err := hApp.AppendHistogram(nil, ts, h, false)
|
|
require.Equal(t, oldChunkBytes, oldChunk.Bytes()) // Sanity check that previous chunk is untouched.
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newChunk)
|
|
require.False(t, recoded)
|
|
require.NotEqual(t, oldChunk, newChunk)
|
|
require.Equal(t, expectHeader, newChunk.(*HistogramChunk).GetCounterResetHeader())
|
|
require.NotNil(t, newAppender)
|
|
require.NotEqual(t, hApp, newAppender)
|
|
assertSampleCount(t, newChunk, 1, ValHistogram)
|
|
}
|
|
|
|
func assertRecodedHistogramChunkOnAppend(t *testing.T, prevChunk Chunk, hApp *HistogramAppender, ts int64, h *histogram.Histogram, expectHeader CounterResetHeader) {
|
|
prevChunkBytes := prevChunk.Bytes()
|
|
newChunk, recoded, newAppender, err := hApp.AppendHistogram(nil, ts, h, false)
|
|
require.Equal(t, prevChunkBytes, prevChunk.Bytes()) // Sanity check that previous chunk is untouched. This may change in the future if we implement in-place recoding.
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newChunk)
|
|
require.True(t, recoded)
|
|
require.NotEqual(t, prevChunk, newChunk)
|
|
require.Equal(t, expectHeader, newChunk.(*HistogramChunk).GetCounterResetHeader())
|
|
require.NotNil(t, newAppender)
|
|
require.NotEqual(t, hApp, newAppender)
|
|
assertSampleCount(t, newChunk, 2, ValHistogram)
|
|
}
|
|
|
|
func assertSampleCount(t *testing.T, c Chunk, exp int64, vtype ValueType) {
|
|
count := int64(0)
|
|
it := c.Iterator(nil)
|
|
require.NoError(t, it.Err())
|
|
for it.Next() == vtype {
|
|
count++
|
|
}
|
|
require.NoError(t, it.Err())
|
|
require.Equal(t, exp, count)
|
|
}
|
|
|
|
func TestHistogramChunkAppendableWithEmptySpan(t *testing.T) {
|
|
tests := map[string]struct {
|
|
h1 *histogram.Histogram
|
|
h2 *histogram.Histogram
|
|
}{
|
|
"empty span in old and new histogram": {
|
|
h1: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 1, -1, 0, 0, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 1, -1, 1, 0, 0, 0},
|
|
},
|
|
h2: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 37,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -2, 0, -3},
|
|
},
|
|
},
|
|
"empty span in old histogram": {
|
|
h1: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 1, Length: 0}, // This span will disappear.
|
|
{Offset: 2, Length: 4},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 1, -1, 0, 0, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 1, -1, 1, 0, 0, 0},
|
|
},
|
|
h2: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 37,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 3, Length: 4},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -2, 0, -3},
|
|
},
|
|
},
|
|
"empty span in new histogram": {
|
|
h1: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 3, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 1, -1, 0, 0, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 1, -1, 1, 0, 0, 0},
|
|
},
|
|
h2: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 37,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 1, Length: 0}, // This span is new.
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -2, 0, -3},
|
|
},
|
|
},
|
|
"two empty spans mixing offsets": {
|
|
h1: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 1, Length: 0},
|
|
{Offset: 3, Length: 0},
|
|
{Offset: 4, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 1, -1, 0, 0, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 1, -1, 1, 0, 0, 0},
|
|
},
|
|
h2: &histogram.Histogram{
|
|
Schema: 0,
|
|
Count: 37,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 3, Length: 0},
|
|
{Offset: 1, Length: 0},
|
|
{Offset: 4, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -2, 0, -3},
|
|
},
|
|
},
|
|
}
|
|
|
|
for name, tc := range tests {
|
|
t.Run(name, func(t *testing.T) {
|
|
c := Chunk(NewHistogramChunk())
|
|
|
|
// Create fresh appender and add the first histogram.
|
|
app, err := c.Appender()
|
|
require.NoError(t, err)
|
|
require.Equal(t, 0, c.NumSamples())
|
|
|
|
_, _, _, err = app.AppendHistogram(nil, 1, tc.h1, true)
|
|
require.NoError(t, err)
|
|
require.Equal(t, 1, c.NumSamples())
|
|
hApp, _ := app.(*HistogramAppender)
|
|
|
|
pI, nI, okToAppend, counterReset := hApp.appendable(tc.h2)
|
|
require.Empty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.True(t, okToAppend)
|
|
require.False(t, counterReset)
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestAtFloatHistogram(t *testing.T) {
|
|
input := []histogram.Histogram{
|
|
{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 1, -1, 0, 0, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 1, -1, 1, 0, 0, 0},
|
|
},
|
|
{
|
|
Schema: 0,
|
|
Count: 36,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 1, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -2, 0, -3},
|
|
},
|
|
{
|
|
Schema: 0,
|
|
Count: 36,
|
|
Sum: 1111.1,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []int64{1, 2, -2, 2, -1, 0, 0},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []int64{1, 3, -2, 5, -1, 0, -3},
|
|
},
|
|
}
|
|
|
|
expOutput := []*histogram.FloatHistogram{
|
|
{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []float64{1, 2, 1, 1, 1, 1, 1},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []float64{1, 2, 1, 2, 2, 2, 2},
|
|
},
|
|
{
|
|
CounterResetHint: histogram.NotCounterReset,
|
|
Schema: 0,
|
|
Count: 36,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []float64{1, 3, 1, 2, 1, 1, 1},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []float64{1, 4, 2, 7, 5, 5, 2},
|
|
},
|
|
{
|
|
CounterResetHint: histogram.NotCounterReset,
|
|
Schema: 0,
|
|
Count: 36,
|
|
Sum: 1111.1,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 0, Length: 0},
|
|
{Offset: 0, Length: 3},
|
|
},
|
|
PositiveBuckets: []float64{1, 3, 1, 3, 2, 2, 2},
|
|
NegativeSpans: []histogram.Span{
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 2, Length: 0},
|
|
{Offset: 2, Length: 3},
|
|
},
|
|
NegativeBuckets: []float64{1, 4, 2, 7, 6, 6, 3},
|
|
},
|
|
}
|
|
|
|
chk := NewHistogramChunk()
|
|
app, err := chk.Appender()
|
|
require.NoError(t, err)
|
|
for i := range input {
|
|
newc, _, _, err := app.AppendHistogram(nil, int64(i), &input[i], false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newc)
|
|
}
|
|
it := chk.Iterator(nil)
|
|
i := int64(0)
|
|
for it.Next() != ValNone {
|
|
ts, h := it.AtFloatHistogram()
|
|
require.Equal(t, i, ts)
|
|
require.Equal(t, expOutput[i], h, "histogram %d unequal", i)
|
|
i++
|
|
}
|
|
}
|
|
|
|
func TestHistogramChunkAppendableGauge(t *testing.T) {
|
|
setup := func() (Chunk, *HistogramAppender, int64, *histogram.Histogram) {
|
|
c := Chunk(NewHistogramChunk())
|
|
|
|
// Create fresh appender and add the first histogram.
|
|
app, err := c.Appender()
|
|
require.NoError(t, err)
|
|
require.Equal(t, 0, c.NumSamples())
|
|
|
|
ts := int64(1234567890)
|
|
h1 := &histogram.Histogram{
|
|
CounterResetHint: histogram.GaugeType,
|
|
Count: 5,
|
|
ZeroCount: 2,
|
|
Sum: 18.4,
|
|
ZeroThreshold: 1e-125,
|
|
Schema: 1,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 2},
|
|
{Offset: 2, Length: 1},
|
|
{Offset: 3, Length: 2},
|
|
{Offset: 3, Length: 1},
|
|
{Offset: 1, Length: 1},
|
|
},
|
|
PositiveBuckets: []int64{6, -3, 0, -1, 2, 1, -4}, // {6, 3, 3, 2, 4, 5, 1}
|
|
}
|
|
|
|
chk, _, app, err := app.AppendHistogram(nil, ts, h1.Copy(), false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, chk)
|
|
require.Equal(t, 1, c.NumSamples())
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
|
|
return c, app.(*HistogramAppender), ts, h1
|
|
}
|
|
|
|
{ // Schema change.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.Schema++
|
|
_, _, _, _, _, _, ok := hApp.appendableGauge(h2)
|
|
require.False(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.False(t, recoded)
|
|
require.NotEqual(t, c, newc)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
require.Equal(t, GaugeType, newc.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // Zero threshold change.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.ZeroThreshold += 0.1
|
|
_, _, _, _, _, _, ok := hApp.appendableGauge(h2)
|
|
require.False(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.False(t, recoded)
|
|
require.NotEqual(t, c, newc)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
require.Equal(t, GaugeType, newc.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // New histogram that has more buckets.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: 0, Length: 3},
|
|
{Offset: 1, Length: 1},
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 3, Length: 3},
|
|
}
|
|
h2.Count += 9
|
|
h2.ZeroCount++
|
|
h2.Sum = 30
|
|
h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 1} // {7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Greater(t, len(pI), 0)
|
|
require.Len(t, nI, 0)
|
|
require.Len(t, pBackwardI, 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.True(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // New histogram that has buckets missing.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: 0, Length: 2},
|
|
{Offset: 2, Length: 1},
|
|
{Offset: 3, Length: 1},
|
|
{Offset: 4, Length: 1},
|
|
{Offset: 1, Length: 1},
|
|
}
|
|
h2.Count -= 4
|
|
h2.Sum--
|
|
h2.PositiveBuckets = []int64{6, -3, 0, -1, 3, -4} // {6, 3, 3, 2, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Len(t, pI, 0)
|
|
require.Len(t, nI, 0)
|
|
require.Greater(t, len(pBackwardI), 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newc)
|
|
require.False(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // New histogram that has a bucket missing and new buckets.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: 0, Length: 2},
|
|
{Offset: 5, Length: 2},
|
|
{Offset: 3, Length: 1},
|
|
{Offset: 1, Length: 1},
|
|
}
|
|
h2.Sum = 21
|
|
h2.PositiveBuckets = []int64{6, -3, -1, 2, 1, -4} // {6, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Greater(t, len(pI), 0)
|
|
require.Greater(t, len(pBackwardI), 0)
|
|
require.Len(t, nI, 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.True(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // New histogram that has a counter reset while buckets are same.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.Sum = 23
|
|
h2.PositiveBuckets = []int64{6, -4, 1, -1, 2, 1, -4} // {6, 2, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Len(t, pI, 0)
|
|
require.Len(t, nI, 0)
|
|
require.Len(t, pBackwardI, 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, newc)
|
|
require.False(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{ // New histogram that has a counter reset while new buckets were added.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: 0, Length: 3},
|
|
{Offset: 1, Length: 1},
|
|
{Offset: 1, Length: 4},
|
|
{Offset: 3, Length: 3},
|
|
}
|
|
h2.Sum = 29
|
|
h2.PositiveBuckets = []int64{7, -2, -4, 2, -2, -1, 2, 3, 0, -5, 0} // {7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 0}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Greater(t, len(pI), 0)
|
|
require.Len(t, nI, 0)
|
|
require.Len(t, pBackwardI, 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.True(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
|
|
{
|
|
// New histogram that has a counter reset while new buckets were
|
|
// added before the first bucket and reset on first bucket.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.PositiveSpans = []histogram.Span{
|
|
{Offset: -3, Length: 2},
|
|
{Offset: 1, Length: 2},
|
|
{Offset: 2, Length: 1},
|
|
{Offset: 3, Length: 2},
|
|
{Offset: 3, Length: 1},
|
|
{Offset: 1, Length: 1},
|
|
}
|
|
h2.Sum = 26
|
|
h2.PositiveBuckets = []int64{1, 1, 3, -2, 0, -1, 2, 1, -4} // {1, 2, 5, 3, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Greater(t, len(pI), 0)
|
|
require.Len(t, nI, 0)
|
|
require.Len(t, pBackwardI, 0)
|
|
require.Len(t, nBackwardI, 0)
|
|
require.True(t, ok)
|
|
|
|
newc, recoded, _, err := hApp.AppendHistogram(nil, ts+1, h2, false)
|
|
require.NoError(t, err)
|
|
require.NotNil(t, newc)
|
|
require.True(t, recoded)
|
|
require.Equal(t, GaugeType, c.(*HistogramChunk).GetCounterResetHeader())
|
|
}
|
|
}
|