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Inconsistent Sampling Result Names #938

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Sep 15, 2020
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Inconsistent Sampling Result Names #938

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08c3499
Inconsistent SamplingDecision Names
ejsmith Sep 10, 2020
792641d
Merge branch 'master' into patch-1
ejsmith Sep 11, 2020
fa5aa31
Use imperative names for sampling result
ejsmith Sep 11, 2020
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10 changes: 5 additions & 5 deletions specification/trace/sdk.md
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Expand Up @@ -93,10 +93,10 @@ Returns the sampling Decision for a `Span` to be created.
It produces an output called `SamplingResult` which contains:

* A sampling `Decision`. One of the following enum values:
* `NOT_RECORD` - `IsRecording() == false`, span will not be recorded and all events and attributes
* `IGNORE` - `IsRecording() == false`, span will not be recorded and all events and attributes
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Since the description says "will be dropped" here, maybe DROP would be an even better name. I'm fine with IGNORE or SKIP too though.

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I think I like DROP better.

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+1 for DROP. This is necessary for opentelemetry-cpp because IGNORE is defined as macro as constant. This build failure for details.

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@ThomsonTan Then the main problem there seems to be that you have defined a macro constant 😃 And isn't the usual C++ idiom to only have macros/defines in ALL_CAPS? Then you would write SamplingResult::Drop or SamplingResult::drop or similar.

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@Oberon00 the problem is not defined by opentelemetry-cpp, as IGNORE is sounds like a common word, there is chance of name collision. Change casing in C++ sounds a good suggestion though.

will be dropped.
* `RECORD` - `IsRecording() == true`, but `Sampled` flag MUST NOT be set.
* `RECORD_AND_SAMPLED` - `IsRecording() == true` AND `Sampled` flag` MUST be set.
* `RECORD_ONLY` - `IsRecording() == true`, but `Sampled` flag MUST NOT be set.
* `RECORD_AND_SAMPLE` - `IsRecording() == true` AND `Sampled` flag` MUST be set.
* A set of span Attributes that will also be added to the `Span`. The returned
object must be immutable (multiple calls may return different immutable objects).

Expand All @@ -115,12 +115,12 @@ The default sampler is `ParentBased(root=AlwaysOn)`.

#### AlwaysOn

* Returns `RECORD_AND_SAMPLED` always.
* Returns `RECORD_AND_SAMPLE` always.
* Description MUST be `AlwaysOnSampler`.

#### AlwaysOff

* Returns `NOT_RECORD` always.
* Returns `IGNORE` always.
* Description MUST be `AlwaysOffSampler`.

#### TraceIdRatioBased
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