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Add isRemote check for context propagation #3329

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merged 13 commits into from
Jun 6, 2022

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vishweshbankwar
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@vishweshbankwar vishweshbankwar commented Jun 2, 2022

Fixes #3315

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Please provide a brief description of the changes here.

For significant contributions please make sure you have completed the following items:

  • Appropriate CHANGELOG.md updated for non-trivial changes
  • Design discussion issue #
  • Changes in public API reviewed

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codecov bot commented Jun 2, 2022

Codecov Report

Merging #3329 (fb2d5a6) into main (a2aa305) will decrease coverage by 0.16%.
The diff coverage is 100.00%.

Impacted file tree graph

@@            Coverage Diff             @@
##             main    #3329      +/-   ##
==========================================
- Coverage   85.44%   85.27%   -0.17%     
==========================================
  Files         270      270              
  Lines        9561     9561              
==========================================
- Hits         8169     8153      -16     
- Misses       1392     1408      +16     
Impacted Files Coverage Δ
src/OpenTelemetry/Trace/TracerProviderSdk.cs 96.40% <100.00%> (ø)
...entation/ExportClient/OtlpGrpcTraceExportClient.cs 50.00% <0.00%> (-28.58%) ⬇️
...xporter.OpenTelemetryProtocol/OtlpTraceExporter.cs 59.09% <0.00%> (-18.19%) ⬇️
...metryProtocol/Implementation/ActivityExtensions.cs 91.20% <0.00%> (-4.40%) ⬇️
...Telemetry/Internal/SelfDiagnosticsEventListener.cs 96.87% <0.00%> (-0.79%) ⬇️
...ZPages/Implementation/ZPagesExporterEventSource.cs 62.50% <0.00%> (+6.25%) ⬆️

@vishweshbankwar vishweshbankwar marked this pull request as ready for review June 2, 2022 16:38
@vishweshbankwar vishweshbankwar requested a review from a team June 2, 2022 16:38
{
var isRootSpan = traceId == default;
var isRootSpan = traceId == default || isParentRemote;
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This is semantically buggy, I guess?

Maybe:

var isRootSpan = traceId == default;

return isRootSpan || isParentRemote
    ? ...

@@ -2,6 +2,10 @@

## Unreleased

* Included `isRemote` check in `PropagateOrIgnoreData` in `TracerProviderSDK` to
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TracerProvider modified to create activity irrespective of SamplingResult, for spans with Remote Parent, to maintain context propagation.

^ or similar wording.

@cijothomas
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@vishweshbankwar will hold off from merging for a day, as we are doing 1.3.0 stable release, and want to avoid any functional changes.

@cijothomas
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@vishweshbankwar Please fix the conflict, and we are good to go

}

[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static ActivitySamplingResult PropagateOrIgnoreData(ActivityTraceId traceId)
private static ActivitySamplingResult PropagateOrIgnoreData(ActivityTraceId traceId, bool isParentRemote)
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We could probably explore updating the method signature here to something like this:
private static ActivitySamplingResult PropagateOrIgnoreData(in ActivityContext parentContext) and pass in options.Parent to this method. ActivityContext is a readonly struct so using the in modifier might give some minor perf gains.

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Minor:

Method Mean Error StdDev
WithoutInParam 716.8 ns 12.69 ns 11.87 ns
WithInparam 676.5 ns 7.27 ns 6.44 ns

I have updated the method signature

@cijothomas cijothomas merged commit 5a566e6 into open-telemetry:main Jun 6, 2022
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Propagation in case of remote parent
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