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Have the global Propagators default to a no-op instance. #721

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Have the global Propagators default to a no-op instance. #721

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5702786
Have the global Propagators default to a no-op instance.
carlosalberto Jul 20, 2020
d2c7bc2
Merge branch 'master' into global_propagators_initialvalue
carlosalberto Aug 22, 2020
aa69021
Clarify that any component can override the Global Propagators.
carlosalberto Aug 22, 2020
380d1ca
Add a note on the OTel .Net exception.
carlosalberto Aug 22, 2020
9049246
Merge branch 'master' into global_propagators_initialvalue
carlosalberto Aug 23, 2020
ce7047d
Update specification/context/api-propagators.md
carlosalberto Sep 1, 2020
b236789
Update specification/context/api-propagators.md
carlosalberto Sep 1, 2020
af5c4f1
Merge branch 'master' into global_propagators_initialvalue
carlosalberto Sep 1, 2020
c829b9e
Merge branch 'master' into global_propagators_initialvalue
carlosalberto Sep 8, 2020
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12 changes: 7 additions & 5 deletions specification/context/api-propagators.md
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Expand Up @@ -249,11 +249,13 @@ Required arguments:
Implementations MAY provide global `Propagator`s for
each supported `Propagator` type.

If offered, the global `Propagator`s should default to a composite `Propagator`
containing the W3C Trace Context Propagator and the Correlation Context `Propagator`
specified in [api-correlationcontext.md](../correlationcontext/api.md#serialization),
in order to provide propagation even in the presence of no-op
OpenTelemetry implementations.
If offered, the global `Propagator`s MUST default to a no-op instance.
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@carlosalberto in this PR are you advocating for code cleanliness or scenario? This may be the root of the misunderstanding. I think myself, @yurishkuro and @bogdandrutu all advocating for a long term goal of having context ambiently propagated everywhere. It may be that the extensions you mentioned below would be the mechanism of this enablement, but I believe this context should be everywhere.

For example, to explain better what happens in .NET. - there is no context propagation when nothing is enabled. But even smaller level of logging enablement (which is default) will enable context propagation. We clearly recognize some people want to turn it off, But default is ON.

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Sorry for the lack of context. A week ago, in the Specification SIG call (at least @bogdandrutu was there), we came to an agreement on having the API with no-op Propagators by default (.Net will keep its current behavior, given the specific needs of how it's used in the .Net framework and how things are instrumented by default).

But even smaller level of logging enablement (which is default) will enable context propagation

Oh, actually this is what I tried to convey when I mentioned OpenTelemetry extensions (same in spirit, although not quite the same).

cc @bogdandrutu @yurishkuro

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Ping @SergeyKanzhelev

In order to override the default value, an call to
[Set Global Propagator](#set-global-propagator) MUST be done
by either SDK implementations, OpenTelemetry extensions or final application code.
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Note: OpenTelemetry .Net is an exception to this rule as his global
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`Propagator`s default to a set of specific `Propagator`s, including `TraceContext`.

### Get Global Propagator

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