mirror of
https://github.com/hanzoai/telemetry.git
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a47746c5a7
Right now, when merging profiles, we switch dictionary entries when they are used. For example, for each sample, we do: * Run `switchDictionary` for that sample. * Switch all the sample indices dictionaries. * Run `switchDictionary` for the stack associated with that sample. * Update the sample's stack ID with the one provided by the new dictionary. This has a pretty big issue, as when stacks are associated to multiple samples (which is very common in production workloads, but was missed in tests), we will try switching the stack's dictionary multiple times. * Switch the stack's dictionary, works fine. * Switch it again. Now, we try assigning indices from the source dictionary when they have meaning in the destination one. Instead, we now do the following: * Run `switchDictionary` for the stacks. * Loop through samples, and run `switchDictionary` for each of them. * Retrieve the stack. Because we already switched its dictionary, we get a stack already pointing at the new dictionary. * Update the sample's stack ID with the one provided by the new dictionary. <sub>This investigation and PR were proudly done **without** the use of any LLM.</sub> --------- Signed-off-by: Florian Lehner <[email protected]> Co-authored-by: Florian Lehner <[email protected]>
339 lines
7.8 KiB
Go
339 lines
7.8 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package pprofile
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import (
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"errors"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"go.opentelemetry.io/collector/internal/testutil"
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"go.opentelemetry.io/collector/pdata/pcommon"
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)
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func TestSampleSwitchDictionary(t *testing.T) {
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for _, tt := range []struct {
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name string
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sample Sample
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src ProfilesDictionary
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dst ProfilesDictionary
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wantSample Sample
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wantDictionary ProfilesDictionary
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wantErr error
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}{
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{
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name: "with an empty sample",
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sample: NewSample(),
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src: NewProfilesDictionary(),
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dst: NewProfilesDictionary(),
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wantSample: NewSample(),
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wantDictionary: NewProfilesDictionary(),
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},
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{
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name: "with an existing attribute",
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sample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(1)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.StringTable().Append("", "test")
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d.AttributeTable().AppendEmpty()
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a := d.AttributeTable().AppendEmpty()
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a.SetKeyStrindex(1)
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return d
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}(),
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dst: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.StringTable().Append("", "test")
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d.AttributeTable().AppendEmpty()
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d.AttributeTable().AppendEmpty()
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a := d.AttributeTable().AppendEmpty()
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a.SetKeyStrindex(1)
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return d
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}(),
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wantSample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(2)
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return s
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}(),
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wantDictionary: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.StringTable().Append("", "test")
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d.AttributeTable().AppendEmpty()
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d.AttributeTable().AppendEmpty()
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a := d.AttributeTable().AppendEmpty()
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a.SetKeyStrindex(1)
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return d
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}(),
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},
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{
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name: "with an attribute index that does not match anything",
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sample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(1)
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return s
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}(),
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src: NewProfilesDictionary(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(1)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid attribute index 1"),
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},
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{
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name: "with an attribute index equal to the source table length (boundary condition)",
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sample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(2)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.AttributeTable().AppendEmpty()
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d.AttributeTable().AppendEmpty()
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return d
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}(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.AttributeIndices().Append(2)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid attribute index 2"),
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},
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{
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name: "with an existing link",
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sample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(1)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LinkTable().AppendEmpty()
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l := d.LinkTable().AppendEmpty()
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l.SetSpanID(pcommon.SpanID([8]byte{1, 2, 3, 4, 5, 6, 7, 8}))
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return d
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}(),
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dst: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LinkTable().AppendEmpty()
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d.LinkTable().AppendEmpty()
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return d
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}(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(2)
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return s
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}(),
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wantDictionary: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LinkTable().AppendEmpty()
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d.LinkTable().AppendEmpty()
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l := d.LinkTable().AppendEmpty()
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l.SetSpanID(pcommon.SpanID([8]byte{1, 2, 3, 4, 5, 6, 7, 8}))
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return d
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}(),
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},
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{
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name: "with a link index that does not match anything",
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sample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(1)
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return s
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}(),
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src: NewProfilesDictionary(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(1)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid link index 1"),
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},
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{
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name: "with a link index equal to the source table length (boundary condition)",
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sample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(2)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LinkTable().AppendEmpty()
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d.LinkTable().AppendEmpty()
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return d
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}(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetLinkIndex(2)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid link index 2"),
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},
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{
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name: "with an existing stack",
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sample: func() Sample {
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s := NewSample()
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s.SetStackIndex(1)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LocationTable().AppendEmpty().SetAddress(1)
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d.LocationTable().AppendEmpty().SetAddress(2)
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d.StackTable().AppendEmpty()
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s := d.StackTable().AppendEmpty()
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s.LocationIndices().Append(1)
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return d
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}(),
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dst: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LocationTable().AppendEmpty()
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d.LocationTable().AppendEmpty().SetAddress(2)
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d.StackTable().AppendEmpty()
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d.StackTable().AppendEmpty()
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s := d.StackTable().AppendEmpty()
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s.LocationIndices().Append(1)
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return d
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}(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetStackIndex(2)
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return s
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}(),
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wantDictionary: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.LocationTable().AppendEmpty()
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d.LocationTable().AppendEmpty().SetAddress(2)
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d.StackTable().AppendEmpty()
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d.StackTable().AppendEmpty()
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s := d.StackTable().AppendEmpty()
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s.LocationIndices().Append(1)
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return d
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}(),
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},
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{
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name: "with a stack index that does not match anything",
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sample: func() Sample {
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s := NewSample()
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s.SetStackIndex(1)
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return s
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}(),
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src: NewProfilesDictionary(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetStackIndex(1)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid stack index 1"),
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},
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{
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name: "with a stack index equal to the source table length (boundary condition)",
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sample: func() Sample {
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s := NewSample()
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s.SetStackIndex(2)
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return s
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}(),
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src: func() ProfilesDictionary {
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d := NewProfilesDictionary()
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d.StackTable().AppendEmpty()
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d.StackTable().AppendEmpty()
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return d
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}(),
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dst: NewProfilesDictionary(),
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wantSample: func() Sample {
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s := NewSample()
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s.SetStackIndex(2)
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return s
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}(),
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wantDictionary: NewProfilesDictionary(),
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wantErr: errors.New("invalid stack index 2"),
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},
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} {
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t.Run(tt.name, func(t *testing.T) {
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sample := tt.sample
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dst := tt.dst
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err := sample.switchDictionary(tt.src, dst)
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if tt.wantErr == nil {
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require.NoError(t, err)
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} else {
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require.Equal(t, tt.wantErr, err)
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}
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assert.Equal(t, tt.wantSample, sample)
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assert.Equal(t, tt.wantDictionary, dst)
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})
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}
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}
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func BenchmarkSampleSwitchDictionary(b *testing.B) {
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testutil.SkipMemoryBench(b)
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s := NewSample()
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s.SetLinkIndex(1)
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s.SetStackIndex(1)
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src := NewProfilesDictionary()
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src.LocationTable().AppendEmpty()
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src.LocationTable().AppendEmpty().SetAddress(2)
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src.LinkTable().AppendEmpty()
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src.LinkTable().AppendEmpty().SetSpanID(pcommon.SpanID([8]byte{1, 2, 3, 4, 5, 6, 7, 8}))
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src.StackTable().AppendEmpty()
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src.StackTable().AppendEmpty().LocationIndices().Append(1)
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dst := NewProfilesDictionary()
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src.LinkTable().AppendEmpty()
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src.LinkTable().AppendEmpty().SetSpanID(pcommon.SpanID([8]byte{1, 2, 3, 4, 5, 6, 7, 8}))
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b.ReportAllocs()
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for b.Loop() {
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_ = s.switchDictionary(src, dst)
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}
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}
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