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817a2396cb
In the past, every sample value was a float, so it was fine to call a variable holding such a float "value" or "sample". With native histograms, a sample might have a histogram value. And a histogram value is still a value. Calling a float value just "value" or "sample" or "V" is therefore misleading. Over the last few commits, I already renamed many variables, but this cleans up a few more places where the changes are more invasive. Note that we do not to attempt naming in the JSON APIs or in the protobufs. That would be quite a disruption. However, internally, we can call variables as we want, and we should go with the option of avoiding misunderstandings. Signed-off-by: beorn7 <beorn@grafana.com>
94 lines
3.8 KiB
Go
94 lines
3.8 KiB
Go
// Copyright 2022 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 tsdb
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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const testMaxSize int = 32
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// Formulas chosen to make testing easy:
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func valEven(pos int) int { return pos*2 + 2 } // s[0]=2, s[1]=4, s[2]=6, ..., s[31]=64 - Predictable pre-existing values
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func valOdd(pos int) int { return pos*2 + 1 } // s[0]=1, s[1]=3, s[2]=5, ..., s[31]=63 - New values will interject at chosen position because they sort before the pre-existing vals.
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func samplify(v int) sample { return sample{int64(v), float64(v), nil, nil} }
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func makeEvenSampleSlice(n int) []sample {
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s := make([]sample, n)
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for i := 0; i < n; i++ {
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s[i] = samplify(valEven(i))
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}
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return s
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}
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// TestOOOInsert tests the following cases:
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// - Number of pre-existing samples anywhere from 0 to testMaxSize-1.
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// - Insert new sample before first pre-existing samples, after the last, and anywhere in between.
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// - With a chunk initial capacity of testMaxSize/8 and testMaxSize, which lets us test non-full and full chunks, and chunks that need to expand themselves.
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// Note: In all samples used, t always equals v in numeric value. when we talk about 'value' we just refer to a value that will be used for both sample.t and sample.v.
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func TestOOOInsert(t *testing.T) {
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for numPreExisting := 0; numPreExisting <= testMaxSize; numPreExisting++ {
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// For example, if we have numPreExisting 2, then:
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// chunk.samples indexes filled 0 1
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// chunk.samples with these values 2 4 // valEven
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// we want to test inserting at index 0 1 2 // insertPos=0..numPreExisting
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// we can do this by using values 1, 3 5 // valOdd(insertPos)
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for insertPos := 0; insertPos <= numPreExisting; insertPos++ {
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chunk := NewOOOChunk()
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chunk.samples = makeEvenSampleSlice(numPreExisting)
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newSample := samplify(valOdd(insertPos))
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chunk.Insert(newSample.t, newSample.f)
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var expSamples []sample
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// Our expected new samples slice, will be first the original samples.
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for i := 0; i < insertPos; i++ {
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expSamples = append(expSamples, samplify(valEven(i)))
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}
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// Then the new sample.
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expSamples = append(expSamples, newSample)
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// Followed by any original samples that were pushed back by the new one.
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for i := insertPos; i < numPreExisting; i++ {
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expSamples = append(expSamples, samplify(valEven(i)))
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}
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require.Equal(t, expSamples, chunk.samples, "numPreExisting %d, insertPos %d", numPreExisting, insertPos)
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}
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}
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}
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// TestOOOInsertDuplicate tests the correct behavior when inserting a sample that is a duplicate of any
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// pre-existing samples, with between 1 and testMaxSize pre-existing samples and
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// with a chunk initial capacity of testMaxSize/8 and testMaxSize, which lets us test non-full and full chunks, and chunks that need to expand themselves.
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func TestOOOInsertDuplicate(t *testing.T) {
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for num := 1; num <= testMaxSize; num++ {
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for dupPos := 0; dupPos < num; dupPos++ {
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chunk := NewOOOChunk()
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chunk.samples = makeEvenSampleSlice(num)
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dupSample := chunk.samples[dupPos]
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dupSample.f = 0.123
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ok := chunk.Insert(dupSample.t, dupSample.f)
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expSamples := makeEvenSampleSlice(num) // We expect no change.
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require.False(t, ok)
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require.Equal(t, expSamples, chunk.samples, "num %d, dupPos %d", num, dupPos)
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}
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}
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}
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