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583f3e587c
Optimize histogram iterators Histogram iterators allocate new objects in the AtHistogram and AtFloatHistogram methods, which makes calculating rates over long ranges expensive. In #13215 we allowed an existing object to be reused when converting an integer histogram to a float histogram. This commit follows the same idea and allows injecting an existing object in the AtHistogram and AtFloatHistogram methods. When the injected value is nil, iterators allocate new histograms, otherwise they populate and return the injected object. The commit also adds a CopyTo method to Histogram and FloatHistogram which is used in the BufferedIterator to overwrite items in the ring instead of making new copies. Note that a specialized HPoint pool is needed for all of this to work (`matrixSelectorHPool`). --------- Signed-off-by: Filip Petkovski <filip.petkovsky@gmail.com> Co-authored-by: George Krajcsovits <krajorama@users.noreply.github.com>
979 lines
30 KiB
Go
979 lines
30 KiB
Go
// 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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"github.com/prometheus/prometheus/tsdb/tsdbutil"
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)
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type floatResult struct {
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t int64
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h *histogram.FloatHistogram
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}
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func TestFirstFloatHistogramExplicitCounterReset(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.FloatHistogram{
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CounterResetHint: test.hint,
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}
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chk := NewFloatHistogramChunk()
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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.AppendFloatHistogram(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 TestFloatHistogramChunkSameBuckets(t *testing.T) {
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c := NewFloatHistogramChunk()
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var exp []floatResult
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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.AppendFloatHistogram(nil, ts, h.ToFloat(nil), false)
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require.NoError(t, err)
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require.Nil(t, chk)
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exp = append(exp, floatResult{t: ts, h: h.ToFloat(nil)})
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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.AppendFloatHistogram(nil, ts, h.ToFloat(nil), false)
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require.NoError(t, err)
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require.Nil(t, chk)
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expH := h.ToFloat(nil)
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expH.CounterResetHint = histogram.NotCounterReset
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exp = append(exp, floatResult{t: ts, h: expH})
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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.AppendFloatHistogram(nil, ts, h.ToFloat(nil), false)
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require.NoError(t, err)
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require.Nil(t, chk)
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expH = h.ToFloat(nil)
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expH.CounterResetHint = histogram.NotCounterReset
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exp = append(exp, floatResult{t: ts, h: expH})
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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 []floatResult
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for it.Next() == ValFloatHistogram {
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fts, fh := it.AtFloatHistogram(nil)
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act = append(act, floatResult{t: fts, h: 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 []floatResult
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for it2.Next() == ValFloatHistogram {
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fts, fh := it2.AtFloatHistogram(nil)
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act2 = append(act2, floatResult{t: fts, h: 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() == ValFloatHistogram {
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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 []floatResult
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for it3.Next() == ValFloatHistogram {
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fts, fh := it3.AtFloatHistogram(nil)
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act3 = append(act3, floatResult{t: fts, h: 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 []floatResult
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require.Equal(t, ValFloatHistogram, it4.Seek(exp[mid].t))
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// Below ones should not matter.
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require.Equal(t, ValFloatHistogram, it4.Seek(exp[mid].t))
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require.Equal(t, ValFloatHistogram, it4.Seek(exp[mid].t))
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fts, fh := it4.AtFloatHistogram(nil)
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act4 = append(act4, floatResult{t: fts, h: fh})
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for it4.Next() == ValFloatHistogram {
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fts, fh := it4.AtFloatHistogram(nil)
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act4 = append(act4, floatResult{t: fts, h: 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 TestFloatHistogramChunkBucketChanges(t *testing.T) {
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c := Chunk(NewFloatHistogramChunk())
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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.AppendFloatHistogram(nil, ts1, h1.ToFloat(nil), 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.(*FloatHistogramAppender)
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2.ToFloat(nil))
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require.NotEmpty(t, posInterjections)
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require.NotEmpty(t, 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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c, app = hApp.recode(posInterjections, negInterjections, h2.PositiveSpans, h2.NegativeSpans)
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chk, _, _, err = app.AppendFloatHistogram(nil, ts2, h2.ToFloat(nil), 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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expH2 := h2.ToFloat(nil)
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expH2.CounterResetHint = histogram.NotCounterReset
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exp := []floatResult{
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{t: ts1, h: h1.ToFloat(nil)},
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{t: ts2, h: expH2},
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}
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it := c.Iterator(nil)
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var act []floatResult
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for it.Next() == ValFloatHistogram {
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fts, fh := it.AtFloatHistogram(nil)
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act = append(act, floatResult{t: fts, h: 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 TestFloatHistogramChunkAppendable(t *testing.T) {
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setup := func() (Chunk, *FloatHistogramAppender, int64, *histogram.FloatHistogram) {
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c := Chunk(NewFloatHistogramChunk())
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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.FloatHistogram{
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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: []float64{6, 3, 3, 2, 4, 5, 1},
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}
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chk, _, app, err := app.AppendFloatHistogram(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.(*FloatHistogramChunk).GetCounterResetHeader())
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return c, app.(*FloatHistogramAppender), 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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assertNewFloatHistogramChunkOnAppend(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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assertNewFloatHistogramChunkOnAppend(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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h2.PositiveBuckets = []float64{7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 1}
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.NotEmpty(t, posInterjections)
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require.Empty(t, 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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assertRecodedFloatHistogramChunkOnAppend(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 = []float64{6, 3, 2, 4, 5, 1}
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Empty(t, posInterjections)
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require.Empty(t, 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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assertNewFloatHistogramChunkOnAppend(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 = []float64{6, 2, 3, 2, 4, 5, 1}
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Empty(t, posInterjections)
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require.Empty(t, 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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assertNewFloatHistogramChunkOnAppend(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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h2.PositiveBuckets = []float64{7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 0}
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Empty(t, posInterjections)
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require.Empty(t, 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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assertNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
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}
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{
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c, hApp, ts, h1 := setup()
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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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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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}
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h2.Sum = 26
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h2.PositiveBuckets = []float64{1, 2, 5, 3, 3, 2, 4, 5, 1}
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posInterjections, negInterjections, ok, cr := hApp.appendable(h2)
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require.Empty(t, posInterjections)
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require.Empty(t, 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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assertNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, CounterReset)
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}
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{ // New histogram that has an explicit counter reset.
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c, hApp, ts, h1 := setup()
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h2 := h1.Copy()
|
|
h2.CounterResetHint = histogram.CounterReset
|
|
|
|
assertNewFloatHistogramChunkOnAppend(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 := NewFloatHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendFloatHistogram(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, ValFloatHistogram)
|
|
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 := NewFloatHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendFloatHistogram(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, ValFloatHistogram)
|
|
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
|
|
h2.PositiveBuckets = []float64{7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 1}
|
|
|
|
nextChunk := NewFloatHistogramChunk()
|
|
app, err := nextChunk.Appender()
|
|
require.NoError(t, err)
|
|
newChunk, recoded, newApp, err := app.AppendFloatHistogram(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, ValFloatHistogram)
|
|
require.Equal(t, NotCounterReset, nextChunk.GetCounterResetHeader())
|
|
}
|
|
}
|
|
|
|
func assertNewFloatHistogramChunkOnAppend(t *testing.T, oldChunk Chunk, hApp *FloatHistogramAppender, ts int64, h *histogram.FloatHistogram, expectHeader CounterResetHeader) {
|
|
oldChunkBytes := oldChunk.Bytes()
|
|
newChunk, recoded, newAppender, err := hApp.AppendFloatHistogram(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.(*FloatHistogramChunk).GetCounterResetHeader())
|
|
require.NotNil(t, newAppender)
|
|
require.NotEqual(t, hApp, newAppender)
|
|
assertSampleCount(t, newChunk, 1, ValFloatHistogram)
|
|
}
|
|
|
|
func assertNoNewFloatHistogramChunkOnAppend(t *testing.T, oldChunk Chunk, hApp *FloatHistogramAppender, ts int64, h *histogram.FloatHistogram, expectHeader CounterResetHeader) {
|
|
oldChunkBytes := oldChunk.Bytes()
|
|
newChunk, recoded, newAppender, err := hApp.AppendFloatHistogram(nil, ts, h, false)
|
|
require.NotEqual(t, oldChunkBytes, oldChunk.Bytes()) // Sanity check that previous chunk is untouched.
|
|
require.NoError(t, err)
|
|
require.Nil(t, newChunk)
|
|
require.False(t, recoded)
|
|
require.Equal(t, expectHeader, oldChunk.(*FloatHistogramChunk).GetCounterResetHeader())
|
|
require.NotNil(t, newAppender)
|
|
require.Equal(t, hApp, newAppender)
|
|
assertSampleCount(t, oldChunk, 2, ValFloatHistogram)
|
|
}
|
|
|
|
func assertRecodedFloatHistogramChunkOnAppend(t *testing.T, prevChunk Chunk, hApp *FloatHistogramAppender, ts int64, h *histogram.FloatHistogram, expectHeader CounterResetHeader) {
|
|
prevChunkBytes := prevChunk.Bytes()
|
|
newChunk, recoded, newAppender, err := hApp.AppendFloatHistogram(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.(*FloatHistogramChunk).GetCounterResetHeader())
|
|
require.NotNil(t, newAppender)
|
|
require.NotEqual(t, hApp, newAppender)
|
|
assertSampleCount(t, newChunk, 2, ValFloatHistogram)
|
|
}
|
|
|
|
func TestFloatHistogramChunkAppendableWithEmptySpan(t *testing.T) {
|
|
tests := map[string]struct {
|
|
h1 *histogram.FloatHistogram
|
|
h2 *histogram.FloatHistogram
|
|
}{
|
|
"empty span in old and new histogram": {
|
|
h1: &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},
|
|
},
|
|
h2: &histogram.FloatHistogram{
|
|
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: []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},
|
|
},
|
|
},
|
|
"empty span in old histogram": {
|
|
h1: &histogram.FloatHistogram{
|
|
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: []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},
|
|
},
|
|
h2: &histogram.FloatHistogram{
|
|
Schema: 0,
|
|
Count: 37,
|
|
Sum: 2345.6,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 5,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 3, Length: 4},
|
|
{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},
|
|
},
|
|
},
|
|
"empty span in new histogram": {
|
|
h1: &histogram.FloatHistogram{
|
|
Schema: 0,
|
|
Count: 21,
|
|
Sum: 1234.5,
|
|
ZeroThreshold: 0.001,
|
|
ZeroCount: 4,
|
|
PositiveSpans: []histogram.Span{
|
|
{Offset: 0, Length: 4},
|
|
{Offset: 3, 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},
|
|
},
|
|
h2: &histogram.FloatHistogram{
|
|
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: []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},
|
|
},
|
|
},
|
|
"two empty spans mixing offsets": {
|
|
h1: &histogram.FloatHistogram{
|
|
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: []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},
|
|
},
|
|
h2: &histogram.FloatHistogram{
|
|
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: []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},
|
|
},
|
|
},
|
|
}
|
|
|
|
for name, tc := range tests {
|
|
t.Run(name, func(t *testing.T) {
|
|
c := Chunk(NewFloatHistogramChunk())
|
|
|
|
// Create fresh appender and add the first histogram.
|
|
app, err := c.Appender()
|
|
require.NoError(t, err)
|
|
require.Equal(t, 0, c.NumSamples())
|
|
|
|
_, _, _, err = app.AppendFloatHistogram(nil, 1, tc.h1, true)
|
|
require.NoError(t, err)
|
|
require.Equal(t, 1, c.NumSamples())
|
|
hApp, _ := app.(*FloatHistogramAppender)
|
|
|
|
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 TestFloatHistogramChunkAppendableGauge(t *testing.T) {
|
|
setup := func() (Chunk, *FloatHistogramAppender, int64, *histogram.FloatHistogram) {
|
|
c := Chunk(NewFloatHistogramChunk())
|
|
|
|
// 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.FloatHistogram{
|
|
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: []float64{6, 3, 3, 2, 4, 5, 1},
|
|
}
|
|
|
|
chk, _, app, err := app.AppendFloatHistogram(nil, ts, h1.Copy(), false)
|
|
require.NoError(t, err)
|
|
require.Nil(t, chk)
|
|
require.Equal(t, 1, c.NumSamples())
|
|
require.Equal(t, GaugeType, c.(*FloatHistogramChunk).GetCounterResetHeader())
|
|
return c, app.(*FloatHistogramAppender), ts, h1
|
|
}
|
|
|
|
{ // Schema change.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.Schema++
|
|
_, _, _, _, _, _, ok := hApp.appendableGauge(h2)
|
|
require.False(t, ok)
|
|
|
|
assertNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // Zero threshold change.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.ZeroThreshold += 0.1
|
|
_, _, _, _, _, _, ok := hApp.appendableGauge(h2)
|
|
require.False(t, ok)
|
|
|
|
assertNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // 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 = []float64{7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.NotEmpty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.Empty(t, pBackwardI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertRecodedFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // 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 = []float64{6, 3, 3, 2, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Empty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.NotEmpty(t, pBackwardI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertNoNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // 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 = []float64{6, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.NotEmpty(t, pI)
|
|
require.NotEmpty(t, pBackwardI)
|
|
require.Empty(t, nI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertRecodedFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // New histogram that has a counter reset while buckets are same.
|
|
c, hApp, ts, h1 := setup()
|
|
h2 := h1.Copy()
|
|
h2.Sum = 23
|
|
h2.PositiveBuckets = []float64{6, 2, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.Empty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.Empty(t, pBackwardI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertNoNewFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{ // 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 = []float64{7, 5, 1, 3, 1, 0, 2, 5, 5, 0, 0}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.NotEmpty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.Empty(t, pBackwardI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertRecodedFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
|
|
{
|
|
// 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 = []float64{1, 2, 5, 3, 3, 2, 4, 5, 1}
|
|
|
|
pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.appendableGauge(h2)
|
|
require.NotEmpty(t, pI)
|
|
require.Empty(t, nI)
|
|
require.Empty(t, pBackwardI)
|
|
require.Empty(t, nBackwardI)
|
|
require.True(t, ok)
|
|
|
|
assertRecodedFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, GaugeType)
|
|
}
|
|
}
|
|
|
|
func TestFloatHistogramAppendOnlyErrors(t *testing.T) {
|
|
t.Run("schema change error", func(t *testing.T) {
|
|
c := Chunk(NewFloatHistogramChunk())
|
|
|
|
// Create fresh appender and add the first histogram.
|
|
app, err := c.Appender()
|
|
require.NoError(t, err)
|
|
|
|
h := tsdbutil.GenerateTestFloatHistogram(0)
|
|
var isRecoded bool
|
|
c, isRecoded, app, err = app.AppendFloatHistogram(nil, 1, h, true)
|
|
require.Nil(t, c)
|
|
require.False(t, isRecoded)
|
|
require.NoError(t, err)
|
|
|
|
// Add erroring histogram.
|
|
h2 := h.Copy()
|
|
h2.Schema++
|
|
c, isRecoded, _, err = app.AppendFloatHistogram(nil, 2, h2, true)
|
|
require.Nil(t, c)
|
|
require.False(t, isRecoded)
|
|
require.EqualError(t, err, "float histogram schema change")
|
|
})
|
|
t.Run("counter reset error", func(t *testing.T) {
|
|
c := Chunk(NewFloatHistogramChunk())
|
|
|
|
// Create fresh appender and add the first histogram.
|
|
app, err := c.Appender()
|
|
require.NoError(t, err)
|
|
|
|
h := tsdbutil.GenerateTestFloatHistogram(0)
|
|
var isRecoded bool
|
|
c, isRecoded, app, err = app.AppendFloatHistogram(nil, 1, h, true)
|
|
require.Nil(t, c)
|
|
require.False(t, isRecoded)
|
|
require.NoError(t, err)
|
|
|
|
// Add erroring histogram.
|
|
h2 := h.Copy()
|
|
h2.CounterResetHint = histogram.CounterReset
|
|
c, isRecoded, _, err = app.AppendFloatHistogram(nil, 2, h2, true)
|
|
require.Nil(t, c)
|
|
require.False(t, isRecoded)
|
|
require.EqualError(t, err, "float histogram counter reset")
|
|
})
|
|
}
|