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330 lines
9.9 KiB
330 lines
9.9 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/prometheus/prometheus/model/histogram"
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"github.com/stretchr/testify/require"
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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 []res
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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: 5,
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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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}
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app.AppendHistogram(ts, h)
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exp = append(exp, res{t: ts, h: h})
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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.Count += 9
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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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app.AppendHistogram(ts, h)
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exp = append(exp, res{t: ts, h: h})
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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.Count += 13
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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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app.AppendHistogram(ts, h)
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exp = append(exp, res{t: ts, h: h})
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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 []res
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for it.Next() {
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ts, h := it.AtHistogram()
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act = append(act, res{t: ts, h: h.Copy()})
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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(it1)
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//var res2 []pair
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//for it2.Next() {
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// ts, v := it2.At()
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// res2 = append(res2, pair{t: ts, v: v})
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// }
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// require.NoError(t, it2.Err())
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// require.Equal(t, exp, res2)
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// 3. Test iterator Seek.
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// mid := len(exp) / 2
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// it3 := c.Iterator(nil)
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// var res3 []pair
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// require.Equal(t, true, it3.Seek(exp[mid].t))
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// Below ones should not matter.
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// require.Equal(t, true, it3.Seek(exp[mid].t))
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// require.Equal(t, true, it3.Seek(exp[mid].t))
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// ts, v = it3.At()
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// res3 = append(res3, pair{t: ts, v: v})
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// for it3.Next() {
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// ts, v := it3.At()
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// res3 = append(res3, pair{t: ts, v: v})
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// }
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// require.NoError(t, it3.Err())
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// require.Equal(t, exp[mid:], res3)
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// require.Equal(t, false, it3.Seek(exp[len(exp)-1].t+1))
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}
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type res struct {
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t int64
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h histogram.Histogram
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}
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// Mimics the scenario described for compareSpans().
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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: 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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app.AppendHistogram(ts1, h1)
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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
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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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// 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.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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c, app = hApp.Recode(posInterjections, negInterjections, h2.PositiveSpans, h2.NegativeSpans)
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app.AppendHistogram(ts2, h2)
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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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exp := []res{
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{t: ts1, h: h1},
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{t: ts2, h: h2},
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}
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it := c.Iterator(nil)
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var act []res
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for it.Next() {
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ts, h := it.AtHistogram()
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act = append(act, res{t: ts, h: h.Copy()})
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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 TestHistoChunkAppendable(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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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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app.AppendHistogram(ts, h1)
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require.Equal(t, 1, c.NumSamples())
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{ // New histogram that has more buckets.
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h2 := h1
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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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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.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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}
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{ // New histogram that has a bucket missing.
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h2 := h1
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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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hApp, _ := app.(*HistogramAppender)
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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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}
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{ // New histogram that has a counter reset while buckets are same.
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h2 := h1
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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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hApp, _ := app.(*HistogramAppender)
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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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}
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{ // New histogram that has a counter reset while new buckets were added.
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h2 := h1
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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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hApp, _ := app.(*HistogramAppender)
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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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}
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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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h2 := h1
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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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// Existing histogram should get values converted from the above to:
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// 0, 0, 6, 3, 3, 2, 4, 5, 1
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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{1, 1, 3, -2, 0, -1, 2, 1, -4} // counts: 1, 2, 5, 3, 3, 2, 4, 5, 1 (total 26)
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hApp, _ := app.(*HistogramAppender)
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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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}
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}
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