mirror of
https://github.com/prometheus/prometheus.git
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1cfc8f65a3
This is a bit more conservative than we could be. As long as a chunk isn't the first in a block, we can be pretty sure that the previous chunk won't disappear. However, the incremental gain of returning NotCounterReset in these cases is probably very small and might not be worth the code complications. Wwith this, we now also pay attention to an explicitly set counter reset during ingestion. While the case doesn't show up in practice yet, there could be scenarios where the metric source knows there was a counter reset even if it might not be visible from the values in the histogram. It is also useful for testing. Signed-off-by: beorn7 <beorn@grafana.com>
535 lines
15 KiB
Go
535 lines
15 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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)
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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 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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app.AppendFloatHistogram(ts, h.ToFloat())
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exp = append(exp, floatResult{t: ts, h: 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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app.AppendFloatHistogram(ts, h.ToFloat())
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expH := h.ToFloat()
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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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app.AppendFloatHistogram(ts, h.ToFloat())
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expH = h.ToFloat()
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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()
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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()
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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()
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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()
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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()
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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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app.AppendFloatHistogram(ts1, h1.ToFloat())
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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())
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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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app.AppendFloatHistogram(ts2, h2.ToFloat())
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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()
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expH2.CounterResetHint = histogram.NotCounterReset
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exp := []floatResult{
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{t: ts1, h: h1.ToFloat()},
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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()
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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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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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app.AppendFloatHistogram(ts, h1.Copy())
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require.Equal(t, 1, c.NumSamples())
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hApp, _ := app.(*FloatHistogramAppender)
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{ // Schema change.
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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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}
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{ // Zero threshold change.
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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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}
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{ // New histogram that has more buckets.
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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.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.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.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.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.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.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.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.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.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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func TestFloatHistogramChunkAppendableGauge(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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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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app.AppendFloatHistogram(ts, h1.Copy())
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require.Equal(t, 1, c.NumSamples())
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c.(*FloatHistogramChunk).SetCounterResetHeader(GaugeType)
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{ // Schema change.
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h2 := h1.Copy()
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h2.Schema++
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hApp, _ := app.(*FloatHistogramAppender)
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_, _, _, _, _, _, ok := hApp.AppendableGauge(h2)
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require.False(t, ok)
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}
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{ // Zero threshold change.
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h2 := h1.Copy()
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h2.ZeroThreshold += 0.1
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hApp, _ := app.(*FloatHistogramAppender)
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_, _, _, _, _, _, ok := hApp.AppendableGauge(h2)
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require.False(t, ok)
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}
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{ // New histogram that has more buckets.
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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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hApp, _ := app.(*FloatHistogramAppender)
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pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.AppendableGauge(h2)
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require.Greater(t, len(pI), 0)
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require.Len(t, nI, 0)
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require.Len(t, pBackwardI, 0)
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require.Len(t, nBackwardI, 0)
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require.True(t, ok)
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}
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{ // New histogram that has buckets missing.
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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: 2, Length: 1},
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{Offset: 3, Length: 1},
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{Offset: 4, Length: 1},
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{Offset: 1, Length: 1},
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}
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h2.Count -= 4
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h2.Sum--
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h2.PositiveBuckets = []float64{6, 3, 3, 2, 5, 1}
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hApp, _ := app.(*FloatHistogramAppender)
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pI, nI, pBackwardI, nBackwardI, _, _, ok := hApp.AppendableGauge(h2)
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require.Len(t, pI, 0)
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require.Len(t, nI, 0)
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require.Greater(t, len(pBackwardI), 0)
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require.Len(t, nBackwardI, 0)
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require.True(t, ok)
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}
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|
{ // New histogram that has a bucket missing and new buckets.
|
|
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}
|
|
|
|
hApp, _ := app.(*FloatHistogramAppender)
|
|
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)
|
|
}
|
|
|
|
{ // New histogram that has a counter reset while buckets are same.
|
|
h2 := h1.Copy()
|
|
h2.Sum = 23
|
|
h2.PositiveBuckets = []float64{6, 2, 3, 2, 4, 5, 1}
|
|
|
|
hApp, _ := app.(*FloatHistogramAppender)
|
|
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)
|
|
}
|
|
|
|
{ // New histogram that has a counter reset while new buckets were added.
|
|
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}
|
|
|
|
hApp, _ := app.(*FloatHistogramAppender)
|
|
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)
|
|
}
|
|
|
|
{
|
|
// New histogram that has a counter reset while new buckets were
|
|
// added before the first bucket and reset on first bucket.
|
|
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}
|
|
|
|
hApp, _ := app.(*FloatHistogramAppender)
|
|
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)
|
|
}
|
|
}
|