Rename ProbabilitySampler to TraceIdRatioBasedSampler and add requirements #611
Conversation
bogdandrutu
requested review from
arminru,
c24t,
carlosalberto,
iredelmeier,
jmacd,
reyang,
SergeyKanzhelev,
tedsuo,
tigrannajaryan and
yurishkuro
as code owners
bogdandrutu
force-pushed
the
probrequirements
branch
from
d77b56e
to
a712040
Compare
|
Do we want to mention security consideration (e.g what's the trust boundary)? E.g. a malicious guy could generate trace ids that always result in the trace being sampled even at extremely low rate. This might be solved by starting a new trace across trust boundary, there are many other solutions, too. |
|
@reyang that is a good point, but I don't think it is in scope of this sampler. I think that is a more general problem and not only for having things sampled (because another way to do that is to always set the traceflag option to 1). There is a special section in w3c about security concerns. |
carlosalberto
added
spec:trace
carlosalberto
added
the
release:required-for-ga
|
This PR was marked stale due to lack of activity. It will be closed in 7 days. |
|
will work on this soon, commenting to not close it |
|
Thanks Bogdan & Yuri! |
bogdandrutu
force-pushed
the
probrequirements
branch
from
a712040
to
c5a42fc
Compare
|
@yurishkuro @lizthegrey PR updated. |
bogdandrutu
changed the title
bogdandrutu
force-pushed
the
probrequirements
branch
from
ce78520
to
1c12035
Compare
Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>
bogdandrutu
force-pushed
the
probrequirements
branch
from
cccb3c3
to
c819f17
Compare
| * A `TraceIdRatioBased` sampler with a given sampling rate MUST also sample all | ||
| traces that any `TraceIdRatioBased` sampler with a lower sampling rate would | ||
| sample. This is important when a backend system may want to run with a higher | ||
| sampling rate than the frontend system, this way all frontend traces will | ||
| still be sampled and extra traces will be sampled on the backend only. |
There was a problem hiding this comment.
This is only relevant for requests that cross trust boundaries because otherwise the sampled flag in the incoming TraceState is honored by the parent-based sampler, right? This could mentioned to avoid confusion.
There was a problem hiding this comment.
Not really, we decided that the samplers like this will not honor any flag or TraceState, is the user responsibility to configure the ParentBased:
The
TraceIdRatioBasedMUST ignore the parentSampledFlag. To respect the parentSampledFlag, theTraceIdRatioBasedshould be used as a delegate of theParentBasedsampler specified below.
There was a problem hiding this comment.
Re-read, yes in general if parent-based is set it is not very important, but even if parent-based is not set this should be the same case.
Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>
In #331 there were questions about why different requirements are important when deciding on the probability sampling algorithm.