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override sampling decision #338
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Signed-off-by: Kuat Yessenov <[email protected]>
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cc @objectiser |
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BTW we discussed this in census-instrumentation/opencensus-specs#218 |
g-easy
reviewed
Jul 1, 2019
| @@ -224,6 +224,8 @@ const SpanContext& Span::context() const { return context_; } | |||
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| bool Span::IsSampled() const { return context_.trace_options().IsSampled(); } | |||
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| void Span::StopRecording() { span_impl_ = nullptr; } | |||
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This approach will not work, it prevents Span::End from doing:
exporter::RunningSpanStoreImpl::Get()->RemoveSpan(span_impl_);
(i.e. leaks memory)
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Ouch. I was not aware of the mechanics of memory management here
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I'm sorry. I wish things were simple.
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How about this approach: #339 @bogdandrutu what do you think? |
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I'm fine with either approach. The health checking trace noise is the most visible impact of not having span abandonment, which should be possible to fix with #339. |
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Clients of opencensus may want to delay the sampling decision until after the span has been created.
For example, at the time envoyproxy decides whether a request is a health check or not, it may already have started recording the span:
To support this use case, other tracers expose a
setSamplingoverride. I think it's sufficient to stop recording the span for this case, e.g. only override the sampling decision to false.Signed-off-by: Kuat Yessenov [email protected]