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Reproduce recoding bug with new and missing buckets

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Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
This commit is contained in:
György Krajcsovits 2024-08-06 10:51:44 +02:00
parent 9e43ad2e37
commit aff089a014
2 changed files with 57 additions and 0 deletions
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28
tsdb/chunkenc/float_histogram_test.go
View file

@ -428,6 +428,34 @@ func TestFloatHistogramChunkAppendable(t *testing.T) {
require.Equal(t, emptyBucketH.PositiveSpans, h2.PositiveSpans)
}
{ // New histogram that has new buckets AND buckets missing but the buckets missing were empty.
emptyBucketH := eh.Copy()
emptyBucketH.PositiveBuckets = []float64{6, 0, 3, 2, 4, 0, 1}
c, hApp, ts, h1 := setup(emptyBucketH)
h2 := h1.Copy()
h2.PositiveSpans = []histogram.Span{
{Offset: 0, Length: 1},
{Offset: 3, Length: 1},
{Offset: 3, Length: 2},
{Offset: 5, Length: 2},
}
h2.PositiveBuckets = []float64{7, 4, 3, 5, 2, 3}
posInterjections, negInterjections, backwardPositiveInserts, backwardNegativeInserts, ok, cr := hApp.appendable(h2)
require.NotEmpty(t, posInterjections)
require.Empty(t, negInterjections)
require.NotEmpty(t, backwardPositiveInserts)
require.Empty(t, backwardNegativeInserts)
require.True(t, ok)
require.False(t, cr)
assertRecodedFloatHistogramChunkOnAppend(t, c, hApp, ts+1, h2, UnknownCounterReset)
// Check that h2 was recoded.
require.Equal(t, []float64{7, 0, 4, 3, 5, 0, 2, 3}, h2.PositiveBuckets)
require.Equal(t, emptyBucketH.PositiveSpans, h2.PositiveSpans)
}
{ // New histogram that has a counter reset while buckets are same.
c, hApp, ts, h1 := setup(eh)
h2 := h1.Copy()

29
tsdb/chunkenc/histogram_test.go
View file

@ -445,6 +445,35 @@ func TestHistogramChunkAppendable(t *testing.T) {
require.Equal(t, emptyBucketH.PositiveSpans, h2.PositiveSpans)
}
{ // New histogram that has new buckets AND buckets missing but the buckets missing were empty.
emptyBucketH := eh.Copy()
emptyBucketH.PositiveBuckets = []int64{6, -6, 1, 1, -2, 1, 1} // counts: 6, 0, 1, 2, 0, 1, 2 (total 12)
c, hApp, ts, h1 := setup(emptyBucketH)
h2 := h1.Copy()
h2.PositiveSpans = []histogram.Span{ // Missing buckets at offset 1 and 9.
{Offset: 0, Length: 1},
{Offset: 3, Length: 1},
{Offset: 3, Length: 1},
{Offset: 4, Length: 1},
{Offset: 1, Length: 2},
}
h2.PositiveBuckets = []int64{7, -5, 1, 0, 1, 1} // counts: 7, 2, 3, 3, 4, 5 (total 23)
posInterjections, negInterjections, backwardPositiveInserts, backwardNegativeInserts, ok, cr := hApp.appendable(h2)
require.NotEmpty(t, posInterjections)
require.Empty(t, negInterjections)
require.NotEmpty(t, backwardPositiveInserts)
require.Empty(t, backwardNegativeInserts)
require.True(t, ok)
require.False(t, cr)
assertRecodedHistogramChunkOnAppend(t, c, hApp, ts+1, h2, UnknownCounterReset)
// Check that h2 was recoded.
require.Equal(t, []int64{7, -7, 2, 1, -3, 3, 1, 1}, h2.PositiveBuckets) // counts: 7, 0, 2, 3 , 0, 3, 5 (total 23)
require.Equal(t, emptyBucketH.PositiveSpans, h2.PositiveSpans)
}
{ // New histogram that has a counter reset while buckets are same.
c, hApp, ts, h1 := setup(eh)
h2 := h1.Copy()