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Change Span specification to focus more on capabilities. #184

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merged 16 commits into from
Jul 24, 2019

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bogdandrutu
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This PR changes a subset of the Span API to the agreed model in #165. The rest of the changes will be added in a different PR, trying to keep this PR small so feedback can be addressed faster.

Updates #165

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API MUST also provide an overload that accepts a [`Link` interface](#link). This
overload allows instrumentation to supply a lazily calculated `Link`.
#### Set Status
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Is the span status supposed to be any custom user-defined string, or will an enum or constants be defined?

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@bogdandrutu bogdandrutu Jul 18, 2019

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I did not get to the Status API. I will clarify in the followup PR.


Retrieve the `Span`s `SpanContext`
A `Span` MUST have the ability to return the `SpanContext` associated with it.
The returned value MUST be the same for the entire Span lifetime.
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Isn't sampled flag a part of span context? In some implementations it could change during the lifetime of a span. What is the actual requirement here?

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I think the current PR does not change the behavior. I do understand your requirement but we should have a separate discussion about this. Filed #189 to track this separately.

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- An API to record lazy initialized links. This can be implemented by providing
a `Link` interface or a concrete `Link` definition and a `LinkFormatter`. If
the language supports overloads then this SHOULD be called `AddLink` otherwise
`AddLazyLink` may be consider.
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is there a ticket describing the use case for "lazy links"?

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This is mostly for the attributes, for example the values may be lazily formatted.

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LGTM

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@tsloughter
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This reads much better :).

I was writing up a whole thing about how in Erlang, with immutable variables, SpanContext maps fine to how the API is defined but the Span's themselves don't. The actual spans are stored in a mutable table keyed on the spancontext. so calls like set_status take the span context and update the status in the table without ever reading the whole span out.. But this PR seems to resolve all that and fits much better.

Co-Authored-By: Chris Kleinknecht <[email protected]>
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Waiting for other approves before I will merge.

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I will wait until tomorrow to merge this, if no comments :)

@bogdandrutu bogdandrutu merged commit a69ac84 into open-telemetry:master Jul 24, 2019
@bogdandrutu bogdandrutu deleted the spancap branch July 24, 2019 12:43
SergeyKanzhelev pushed a commit to SergeyKanzhelev/opentelemetry-specification that referenced this pull request Feb 18, 2020
…try#184)

* Change Span specification to focus more on capabilities.

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Chris Kleinknecht <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Chris Kleinknecht <[email protected]>

* Fix comments from review.

* Clarify that only one attribute,event,link is recorded.
carlosalberto pushed a commit to carlosalberto/opentelemetry-specification that referenced this pull request Oct 31, 2024
…try#184)

* Change Span specification to focus more on capabilities.

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Armin Ruech <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Chris Kleinknecht <[email protected]>

* Update specification/tracing-api.md

Co-Authored-By: Chris Kleinknecht <[email protected]>

* Fix comments from review.

* Clarify that only one attribute,event,link is recorded.
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8 participants